Gaolei Jiang1,2,3*
Nai’ang Wang1*Xin Mao2,3Hua Zhao2,3Linjing Liu2,3Jianmei Shen2Zhenlong Nie2Zhe Wang2- 1Centre for Glacier and Desert Research, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, China
- 2Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, China
- 3Key Laboratory of Quaternary Chronology and Hydro-Environmental Evolution, China Geological Survey, Shijiazhuang, China
Understanding the evolution of lakes in arid areas is very important for water resource management. Previous studies have mainly focused on lakes with runoff recharge, while the evolution of groundwater recharge lakes in hyper-arid areas is still less known. In this study, an 86 cm-long sediment core was extracted from Sayinwusu Lake, one of groundwater-recharge lakes in the southeastern Badain Jaran Desert, Northwest China. 210Pb and 137Cs dating, total organic carbon (TOC) and total nitrogen (TN) contents, and mineral content analysis were used to reconstruct the lake evolution over the past 140 years. The evolution of Sayinwusu Lake since 1880 can be divided into two periods. In the first period from 1880 to 1950, the TOC and TN contents were low, and the minerals consisted of all detrital minerals, which indicate that the lake’s primary productivity and salinity were low. During the second period from 1950 to 2018, the contents of TOC, TN, and carbonate minerals increased rapidly at the beginning of the 1950s, indicating that the lake’s primary productivity and salinity increased. Comprehensive analysis of regional climate data suggests that the increase in evaporation caused by rising temperature is an important factor affecting lake evolution in the desert. Although precipitation has increased in the arid region of Northwest China in recent decades with increasing temperature, the enhancement of the evaporation effect is much greater. As a record from groundwater recharge lakes in deserts, our study provides new insight into projecting future lake changes in hyper-arid areas.
Introduction
Lakes are important water resources, especially in hyper-arid areas. Understanding lake evolution patterns can help us predict lake development trends and manage water resources (Panizzo et al., 2013; Creutz et al., 2016; Lopez et al., 2019; Wan et al., 2019; Woolway et al., 2020). Previous studies of lake evolution have mainly focused on the important role of runoff, precipitation, and/or snow melt water in hydrological systems (Zhai et al., 2011; Long et al., 2012; Liu et al., 2013; Li et al., 2016). In hyper-arid areas, including Xinjiang Province and Gansu Province, recharge by groundwater plays a crucial role in the evolution of the main inland basin and is at least equal to, if not greater than, the amount of runoff and precipitation (Zhang and Li, 2005a; Zhang and Li, 2005b). The evolution of lakes recharged by groundwater is characterized by intense vertical intersphere water recharge from other areas and no discharge except evaporation; this situation is different from the previous lake evolution model. Many studies have been conducted and have achieved much progress on the evolution pattern, driving factors of lake evolution, and response to climate change for lakes recharged by runoff and/or precipitation (Chen et al., 2009; Long et al., 2012; Liu et al., 2013; Wang et al., 2014; Wu et al., 2020; Fu et al., 2021). However, much less work has been done on the evolution of groundwater recharge lakes.
The Badain Jaran Desert (BJD), located in western Inner Mongolia in a hyper-arid area of China, is sensitive to climate change, with an increase in the temperature of 0.34°C per decade (Figure 1; Yang et al., 2011; Ning et al., 2021). The BJD, with an area of 5.2 × 104 km2, is the second largest desert in China (Zhu et al., 2010). It is characterized by the coexistence of more than 110 perennial lakes and thousands of mega-dunes (Dong et al., 2013). The BJD has the tallest mega-dunes on Earth, with mega-dunes more than 100 m tall covering 68% of the area and concentrated in the southeastern part of the sand sea (Dong et al., 2013). More than 90% of the recharge of lakes between mega-dunes is from groundwater (Dong et al., 2016; Wang et al., 2016). Therefore, the BJD is an ideal region to study the evolution pattern of lakes recharged by groundwater. Previous studies in the BJD were mainly based on the dating of discontinuous lake sediments during the late Quaternary, especially the Holocene at the millennial scale (Yang and Williams, 2003; Yang et al., 2010; Bai et al., 2011; Wang et al., 2016; Chen et al., 2019). This is not sufficient for a detailed understanding of the factors influencing lake evolution during past decades, which is important for predicting the development trend in future decades or centuries.
FIGURE 1. Sketch map showing the geographic setting of the BJD (A), the location of the SY-2 sediment core from Sayinwusu Lake (B), and the variation in monthly temperature (red circles) and precipitation (blue pillars) [(C), data are the averages for 1960–2017].
The global environment has experienced dramatic change, with the highest rate of increase in global temperature over the last century (Woolway et al., 2020). Arid zones are recognized to be more sensitive than other areas to temperature variations associated with global climate change (Huang et al., 2016), and the resulting changes in evaporation are an important factor in lake evolution (Li et al., 2016; Wang et al., 2016). Therefore, the past century is a key period for understanding lake evolution and predicting its trend in the context of global warming (Neukom et al., 2019). Unfortunately, few studies on lake evolution have been conducted during this period in the BJD. In this study, we reconstructed the lake evolution history over the last 140 years based on continuous lake sediments, which may provide new insight into projecting the trend of lake evolution responses to future climate change.
Study Area
The BJD is located on the northwestern Alxa Plateau in Northwest China (Figure 1A). It has an elevation of 900–1800 m a.s.l., falling from the southeast to the northwest. To the south, it is bounded by the Beida Mountains (Mt) and the Heishantou Mt (maximum elevation 1963 m a.s.l.), which separate it from the Gobi of the Hexi Corridor (Dong et al., 2013). To the southeast, it is bounded by the Yabrai Mt (maximum elevation 1957 m a.s.l.), which separate it from the Tengger Desert. To the west and northwest, it stretches down to Ugrian Lake and the Heihe River. To the north, it is bounded by Guaizi Lake, close to the Mongolian Gobi (Dong et al., 2013). Stratigraphic studies of the Badain Jaran Basin demonstrate that Cretaceous strata are widely distributed in the piedmont area of the surrounding mountains and the Badain Jaran Desert. They are several thousand metres thick and mainly consist of red and brick-red sandstone, siltstone with calcareous nodules intercalated with a small amount of conglomerate, and calcareous sandstone (BGMIMAR, 1991). Cenozoic sediments are distributed in the western and southern intermontane areas, which unconformably underlie the upper Quaternary deposits and are less than 200 m thick. The Quaternary aeolian sand has a thickness of 200–400 m and is intercalated with several lacustrine layers (Wang et al., 2015a). Studies have assumed that the sandy materials in the Badain Jaran should have been derived from the weathered extensive lacustrine sediments of dry lake beds in the west and northwest (Yang, 1991; Yan et al., 2001) and the giant alluvial fan of the Heihe River (Mischke, 2005; Hu and Yang, 2016).
The lakes lying among mega-dunes are concentrated within an area of approximately 4,000 km2 (Dong et al., 2013). Most lakes are less than 0.6 km2, and the largest is 1.46 km2. Water depth is generally a few metres up to 10 m, and the deepest lake depth is 15.9 m (Zhang et al., 2013; Wang et al., 2016). The hydrological properties of the lakes vary greatly, with the total dissolved solids (TDS) ranging from less than 1 to 400 g/L (Yang and Williams, 2003; Lu et al., 2010). Most lakes from the southeast edge to the hinterland are of the sulfate–carbonate–chloride type with increasing salinity (Lu et al., 2010). Although the origin of groundwater in the desert remains a hotly debated issue, it is generally agreed that groundwater is the main water source of the lakes and is primarily from the south and southeast areas, such as the Yabrai Mt, and Qilian Mt (Ma and Edmunds, 2006; Gates et al., 2008a; Dong et al., 2013; Wang et al., 2016).
The BJD has an extreme continental desert-type climate (Dong et al., 2004). The mean precipitation ranges from 40 to 90 mm, decreasing from the southeast to the northwest. Most of the precipitation occurs in summer (Figure 1C). The evaporation from lake surfaces is 1,450 mm, which is more than 20 times the amount of precipitation (Hu et al., 2015). The mean annual air temperature ranges from 9.5 to 10.3°C, with the lowest monthly mean temperature of 8.3°C in January and the highest of 24.1°C in July (Figure 1C). The mean annual wind speed ranges from 2.8 to 4.6 m s−1, and the wind direction is mainly northwest (Hu and Yang, 2016).
The surface vegetation coverage of the BJD ranges from 5 to 50, with most areas having very low coverage; the vegetation is dominated by xerophytic and ultraxerophytic shrubs and subshrubs, and herbacea is dominated by annual plants. On the sandy hills, the vertical distribution of vegetation is obvious. In the dry lake basin, the Nitraria tangutorum community is widely distributed, accompanied by Zygophyllum xanthoxylum and Calligonum mongolicum (Cui et al., 2014; Wang et al., 2015b). Around the modern lake shore, the vegetation is distributed in a ribbon with a width of a few metres to a dozen metres. Along the lake, there is a marsh-shaped halophytic meadow, mainly composed of Trigolochin maritimum, Glaux maritima, and Aeluro littorlis. In the periphery, there is a halophytic meadow, mainly composed of Phragmites communis and Achnatherum splendens. Due to the government’s relocation policy and the improvement of living conditions, there are only a few herders living around a few lakes. In 2009, the BJD became a global desert geopark, and thousands of people visited it every year, mainly in October.
The distribution of lakes in the BJD is relatively concentrated in the southeastern region. Lakes with lower salinities are more sensitive to the environmental changes and are easily observed for hydrochemical changes. Sayinwusu Lake, located at the southeastern margin of the BJD, has an area of approximately 0.12 km2 (Figure 1B). The lake is 720 m long and 170 m at the widest point, with the largest water depth of approximately 2 m. The lake water has a pH of 9.5 and salinity of 18.0 g/L with major cations of K+ (384 mg/L), Na+ (5,330 mg/L), Ca2+ (37 mg/L), and Mg2+ (751 mg/L) and major anions of Cl− (6,440 mg/L), SO42− (4,166 mg/L), HCO3− (693 mg/L), and CO32− (531 mg/L) (team unpublished data). Due to the high salinity, there are no fish in the lake, and no animals, such as camels, drink the lake water. Terrestrial vegetation is distributed in belts around the lake shores, with areal extents of tens of metres. The dominant plant species around the lake are mainly xerophytes, super-arid shrubs, and semi-shrubs, and are mainly composed of Trigolochin maritimum, Glaux maritima, and Aeluro littorlis inside and Phragmites communis and Achnatherum splendens outside.
Materials and Methods
Field Sampling
An 86 cm long sediment core (SY-2) was drilled from the centre of Sayinwusu Lake (102°19.82′ E, 39°34.00′ N) in September 2018 A.D. using a gravity corer. The water depth of the sampling point is approximately 1.6 m. The sediment core was sectioned at 1.0 cm intervals (86 samples) and then fully dried in a vacuum-freezing dryer at −25°C for 48–72 h. Before laboratory analysis, these samples were stored in a dry place at room temperature.
210Pb and 137Cs Dating
Twenty-five subsamples were selected at 2-cm intervals for the upper 50 cm part of the sediment core and were ground to fine powder (< 63 μm) in an agate mortar. The activities of 137Cs, 210Pb, and 226Ra in the samples were determined by a low-background well-type germanium detector (EG and GOrtec Gamma Spectrometry) at the State Key Laboratory of Lake Sciences and Environment, CAS. 137Cs was detected at 662 keV, 210Pb was determined via gamma emission at 46.5 keV, 226Ra was measured at 295 keV, and 352 keV g-rays were emitted by its daughter isotope 214Pb. Standard errors (2σ) were calculated from the counting statistics. The excess 210Pb (210Pbex) activity was calculated by subtracting the activity of 226Ra from the total 210Pb activity. 210Pbex activity is employed to calculate a chronology using the constant rate of supply (CRS) dating model (Appleby and Oldfield, 1978; Appleby, 2001; Swarzenski, 2014). The calculated equation is as follows:
Ah = A0e−λt,
where Ah is the cumulative residual unsupported or excess 210Pb activity beneath sediment of depth h, A0 is the total unsupported 210Pb activity in the sediment column, λ is the 210Pb decay constant, 0.03114 years−1, and t represents time.
TOC and TN Analysis
Eighty-four subsamples at 1 cm intervals were ground to fine powder (< 63 μm) in an agate mortar, treated with 1 N HCl to remove inorganic carbonates, and then rinsed repeatedly with deionized water to remove soluble salts. The residual samples were dried for measurement. The total carbon and total nitrogen contents were determined by an EA 3,000 elemental analyser at the State Key Laboratory of Lake Sciences and Environment, Chinese Academy of Science (CAS). The repetitive errors were less than 3%. The total organic carbon contents were calculated by subtracting the inorganic carbon contents in carbonates from the total carbon contents.
The total organic carbon (TOC)/total nitrogen (TN) ratios of lacustrine sediments are usually used to evaluate the predominance of autochthonous versus allochthonous sources of organic matter (Meyers, 2003). In general, carbon-to-nitrogen (C/N) ratios less than 10 indicate that the organic matter is from protein-rich and cellulose-poor aquatic organisms (Meyers, 2003), the mean C/N value of benthos is approximately 3, and algae and phytoplankton have values of approximately 5–12 and generally less than 10 (Hedges et al., 2002). However, when the organic matter is from protein-poor and cellulose-rich terrestrial plants, the C/N ratio is greater than 20 (Meyers, 2003).
Mineral Analysis
Eighty-six subsamples at 1 cm intervals were ground to fine powder prior to measurement. The mineralogy was measured at the Key Laboratory of Western China’s Environmental Systems (Ministry of Education) by a powder X-ray diffractometer (XRD, PANalytical X’Pert Pro MPD). Each sample was spread and leveled onto a 1.5 cm2 × 1.5 cm2 concave glass plate for XRD determinations. XRD employs the radiation of a Cu target at 40 kV and 40 mA to generate X-rays that irradiate a sample at a scanning angle of 2ɵ (5–75°) with a 0.01° minimum step size and produce the diffraction peaks of the sample. Other equipment settings are automatic variable divergence detector slits. Corundum (α-Al2O3) was selected as the internal standard. The compositions of minerals in samples were determined by comparison of the characteristic diffraction peaks with the standard card spectrum using the software X'Pert HighScore Plus. The detailed calculation method of mineral content can be found in Last (2001).
Results
210Pb and 137Cs
In the studied sediment core, the vertical distributions of the activities of 210Pb and 137Cs are shown in Table 1 and Figure 2A. The first appearance of 137Cs activity occurs at a depth of 36 cm with a corresponding activity of 1.83 Bq/kg. The peak of 137Cs activity is identified at a depth of 30 cm with a corresponding activity of 18.47 Bq/kg. Above 30 cm, the 137Cs activity gradually decreased to approximately about 3 Bq/kg (Figure 2A). The excess 210Pb (210Pbex) activity in the core decreases from 253.39 Bq/kg at the core surface to near zero at 50 cm depth (Figure 2A).
TABLE 1. Measured results and standard errors (2σ) for 210Pb and 137Cs dating.
FIGURE 2. Age model for sediment core SY-2. (A)137Cs and excess 210Pb (210Pbex) activity versus depth. (B) Age-depth relation from 210Pb and 137Cs dating.
TOC, TN, and TOC/TN
The TOC and TN contents are very low and constant around 0.1% for TOC and ∼0.05% for TN, and no clear peak is observed during this period. The C/N ratio is very noisy during this period except for 1885 A.D., where a very strong peak is observed. The TOC content increases rapidly at 40–41 cm (1948–1950 A.D.) and then maintains a higher content (0.40–1.47%), and Figure 3 shows four main peaks compared to the geochemical background of approximately 0.5% for TOC and 0.15% for TN. These main peaks correspond to the years 1950–1952 (TOC = 0.85%, TN = 0.10%), 1960 (TOC = 0.8%, TN = 0.12%), 1995 (TOC = 1.47%, TN = 0.24%), ∼2004–2007 (TOC = 1.13%, TN = 0.18%), and the highest peak (TOC = 2.01%, TN = 0.35%) observed for 2015–2018. Overall, the TOC/TN ratios are less than 10 with an average value of 6.25. The C/N ratio during 1950–2018 decreased slowly from 8 to 5, and the noise strongly decreased compared to the 1880–1950 period (Figure 3).
FIGURE 3. TOC and TN contents and the C/N ratios in sediment core SY-2.
Mineral Variations
The mineral constituents of core SY-2 at 44–85 cm (1880–1944 A.D.) are detrital minerals, including quartz, feldspars, and mica and a small amount of clay minerals, such as chamosite and clinochlore. The upper part (0–40 cm; 1945–2018 A.D.) is still dominated by detrital minerals but is characterized by various carbonates, including monohydrocalcite, calcite, and dolomite and a small amount of halite. In this part, the average content of carbonates is 9.5%, with two higher phases for 29–36 cm (1955–1968 A.D.) with a value 11% and 0–16 cm (1998–2018 A.D.) with a value 13%. In carbonates, monohydrocalcite is predominant, with a maximum content of 26% (Figure 4).
FIGURE 4. Variations in mineral composition in core SY-2 from the BJD.
Discussion
Core Chronology
The 137Cs activity versus depth shows no tailing effect, indicating that the vertical migration of 137Cs can be neglected in Sayinwusu Lake (Audry et al., 2004). The first appearance of 137Cs activity at a depth of 36 cm can be dated to the early 1950s (most likely 1952 A.D.) (Jin et al., 2010; Liu et al., 2012). The peak of 137Cs activity at a depth of 30 cm is assigned to the maximum atmospheric global fallout corresponding to 1963 A.D. (Robbins and Edgington, 1975). The CRS dating model suggests an age of 1968 (+11/−16) A.D. at 30 cm and an age of 1955 (+16/−33) A.D. at 36 cm (Figure 2B). The 137 Cs dating yields ages of 1955 A.D. at 36 cm and 1963 A.D. at 30 cm, which is in general agreement with the 210Pb dates. However, the Chernobyl accident in 1986 A.D. is not identified in the studied core, similar to other lacustrine sediment records in China and Japan, because of its small impact on 137Cs activity in these areas (Liu et al., 2012; Zhang et al., 2012).
Based on the CRS dating model, the sedimentation rate decreases below 36 cm (Figure 2B). Clearly, this fact does not accord with the lacustrine sedimentary characteristics, which indicates that the chronology of the 210Pb CRS dating model is not reliable in the lower part of the sediment core (> 36 cm, before 1952 A.D.). Considering that: 1) there is no surface runoff recharge to the lakes in the BJD, and more than 90% of the lake recharge depends on groundwater (Dong et al., 2016; Wang et al., 2016); 2) although the lake sediments are from the surrounding aeolian sand, most of the aeolian sand was transported to the lake shore by saltation and creep (Wang et al., 2018), and sand from the shores is eroded by waves and then distributed in the lake (Li et al., 2018); 3) the locations of lakes and mega-dunes are relatively fixed (Yang et al., 2011; Wang et al., 2016); 4) human and animal activities are limited in the desert, so the lake sediment sequence is considered as formed continuously; 5) the 210Pb and 137Cs dating of adjacent lakes indicate that the sediment accumulation rates were relatively stable in the last century (Herzschuh et al., 2006; Liu et al., 2016); and 6) the average content of carbonate is only 9.5% in the upper part of the sediment core SY-2, which has a limited effect on the deposition rate. Therefore, the age of lower sediments (> 36 cm) can be dated by the average mass accumulation rate and that of the upper sediments (< 36 cm) can be determined by the CRS dating model. Finally, the obtained results show that the sediment core covers a period of ∼1880–2018 A.D. and that the average sedimentation rate of the upper sediments is 0.57 (+0.19/−0.20) cm/a by CRS age model, which is consistent with those of other lakes in the BJD (Liu et al., 2016).
Proxy Interpretation
TOC, TN, and C/N
The C/N ratios of sediment core SY-2 are less than 10, with an average of 6.25, indicating that the organic matter of these sediments is autochthonous, which is consistent with results from other lakes in the BJD (Dong et al., 2018). The lack of a relationship between TOC and C/N (Figure 5A) also suggests that the organic matter of these sediments is autochthonous and reflects primary productivity (Lu and An, 2010). Due to the high salinity, no fish are found in the lake, and no animals, such as camels, drink the lake water. In addition, the administrative region of Alxa Right Banner was established in 1961. Due to government policies and the improvement of living conditions, most herders moved away from the desert in the last 20 or 30 years (based on communications with local herders). Therefore, grazing and local people have little effect on primary productivity. The TOC content reflects primary productivity, which mostly includes endogenous plants in the lake, such as algae and aquatic plants (Kai et al., 2019).
FIGURE 5. Relationships of TOC content with C/N ratio and TN content in the SY-2 core.
The significant positive relationship between TOC and TN (R2 = 0.98, p < 0.001; Figure 5B) observed for SY-2 core sediments suggests that TOC and TN are mainly autochthonous in the lake and that inorganic nitrogen from terrestrial materials is negligible (∼0.05%) (e.g., Liu et al., 2009). Changes in TN indicate the nutritional status of the lake, which is strongly subject to changes in water temperature. Water temperature not only affects the change in TN but also directly and significantly affects the growth of plankton in lakes, thus changing the content of endogenous organic carbon (Lu and An, 2010). Therefore, the significant positive relationship between TOC and TN indicates that higher values of TOC and TN represent higher primary productivity and higher temperatures.
Mineralogy
For the lakes in the hinterland of the BJD, the lacustrine sediments were mainly from the aeolian deposits around the lakes (Li et al., 2018). The mineral compositions of surface sediments in lakes show that detrital minerals compose more than 90% and that the saline minerals in lakes are autochthonous (Suhui et al., 2015).
Authigenic carbonate deposition is related to many factors, such as temperature, salinity, and primary productivity within lakes (Kelts and Hsü, 1978; Tucker and Wright, 1990). In this study, the contents of organic matter and carbonate increased almost simultaneously. Due to the increased productivity, more CO2 (aq) assimilation occurs by thriving algae photosynthesis (Opitz et al., 2012), leading to supersaturation of CO32−, and promoting the deposition of carbonates via the reaction 2HCO3− → CO2 (aq) + H2O + CO32− (Kelts and Hsü, 1978; Zhang et al., 2010). However, in the studied lake, the TOC and TN contents are very low, with average values of 0.77 and 0.13% in the 1950–2018 periods, respectively. This indicated that the primary productivity is very low compared to other lakes, such as Qinghai Lake (Chen et al., 2021) and Bosten Lake (Zhang et al., 2010). Therefore, the primary productivity may be minimal for carbonate precipitation.
Many previous studies suggest that salinity is the most important factor for carbonate precipitation in arid areas (Qiang et al., 2005; Wang et al., 2013; Li et al., 2016). The mineral composition of the surface sediments of the lakes in the BJD also indicated that the saline mineralogical composition and content in lake sediments vary with lake water salinity (Suhui et al., 2015). In core SY-2, the saline minerals are mainly carbonates, including monohydrocalcite, calcite, and dolomite. In the natural environment, monohydrocalcite is predominantly found in water with a high Mg/Ca ratio (high salinity) (Han et al., 2020), such as in the limestone of Ikka Fjord, Greenland (Mg/Ca > 5) (Dahl and Buchardt, 2006); Manito Lake sediments, Canada (Mg/Ca > 40) (Last, 2001); and Namco Lake sediments, Tibet (Mg/Ca > 10) (Li et al., 2009). High salinity, high Mg/Ca ratio, and high alkalinity in lake water facilitate the precipitation of dolomite (i.e., environments with high evaporation intensity) (Deckker and Last, 1988), and dolomite has also been considered an evaporative salt mineral in some studies (Qiang et al., 2005). Therefore, the carbonate content is regarded as an indicator of salinity in studies of lake change (Qiang et al., 2005; Wang et al., 2013).
Lake Evolution and Local Climate Records Over the Past 140 Years
Based on the TOC, TN, and carbonate mineral contents, the evolution of Sayinwusu Lake since 1880 can be divided into two periods. The first period dates from 1880 to 1950 (86–43 cm). During this period, the low contents of TOC and TN and predominantly detrital mineral composition indicate that the lake primary productivity and salinity were low (Figures 6A,B). The second period represents the time from 1950 to 2018 (above 43 cm). The contents of TOC, TN, and carbonate minerals increased rapidly at the beginning of the 1950s, indicating that the primary productivity and salinity of the lake increased (Figures 6A,B). Meanwhile, the simultaneous increases in TOC, TN, and carbonate minerals suggest an increase in regional temperature and evaporation effects. During the second period, the TOC, TN, and carbonate minerals were higher during 1955–1968 and 1998–2018, indicating relatively high temperatures and evaporation effects.
FIGURE 6. TOC and carbonate contents of the SY-2 sedimentary core and comparisons with other regional climate records. (A)-(B) The TOC and carbonate contents of the SY-2 sedimentary core in this study. (C) Reconstruction of precipitation at the southern margin of the BJD (Zhang et al., 2015). (D) Temperature changes in Northwest China (Ding, 2010). (E) Recharge rate of the BJD (Gates et al., 2008b). (F) Solar activity (Muscheler et al., 2007).
Due to the special geographical conditions, there have been a few studies on the reconstruction of regional climate and environment during the last several 100 years. A palynological study of Baoritaolegai Lake sediments in the southeastern BJD over the last 160 years identified three dry periods: the mid 1870s to the beginning of the 1900s, the beginning of the 1920s to the late 1930s, and the beginning of the 1960s to the present (Herzschuh et al., 2006). The tree rings of the shrub (Zygophyllum xanthoxylum Maxim) were affected by precipitation during the last 160 years, and three dry phases were identified: 1840s to early 1850s, early 1890s–1900s, and late 1970s to mid 1980s (Xiao et al., 2012). However, the salinity changes from the lake sediment archives in this study do not agree well with the climatic records of tree rings and palynology in the desert hinterland. There are two possible reasons for the differences. One explanation is that the local precipitation in the desert could not sustain the lakes (Ma et al., 2014). The lakes in the desert area are mainly recharged by groundwater, and the recharge source is from adjacent areas and/or other areas (e.g., Chen et al., 2004; Ma and Edmunds, 2006; Gates et al., 2008a; Shao et al., 2012; Dong et al., 2016; Wang et al., 2016). Similar to the groundwater recharge lakes in the Sahara Desert, lake evolution has little relevance in terms of the local climate but much pertinence regarding changes in groundwater recharge (Creutz et al., 2016). The other explanation is that the climate records of vegetation in the hinterland of the desert reflect precipitation before and during the vegetation growing season, especially the summer (Xiao et al., 2012). The hydrogen and oxygen isotopes of modern precipitation show that the precipitation in the desert is mainly from westerly moisture and that part of the summer is affected by the East Asian summer monsoon (Cao et al., 2020). Therefore, the climate reconstructed by vegetation records in desert areas is a mixed signal of westerly moisture and East Asian summer monsoon precipitation. Consequently, it is reasonable that there is no significant relationship between lake evolution and local precipitation in the BJD.
The Factors Influencing Lake Evolution
In this study, the simultaneous increases in TOC and TN contents indicate that the regional temperature rose at the beginning of the 1950s. Research integrating ice cores, stalagmites, and lake records reveals that the temperature of Northwest China warmed rapidly at the beginning of the 1950s (Figure 6D; Ding, 2010), which is consistent with the rapid warming trend in China (Ge et al., 2015). With rising temperatures, precipitation in the arid region of Northwest China has increased in recent decades (Chen et al., 2020; Liu et al., 2021). The reconstructed precipitation from tree rings shows that the annual precipitation began to increase at the beginning of the 1950s on the southern margin of the desert and the northeastern Tibetan Plateau (Figure 6C; Yang et al., 2010; Yang et al., 2014; Zhang et al., 2015; Liu et al., 2021). Although the recharge source of groundwater in the BJD is still controversial, previous studies have suggested that it is mainly the mountain areas in the southern BJD and/or the northern Tibetan Plateau (Chen et al., 2004; Ma and Edmunds, 2006; Gates et al., 2008a; Gates et al., 2008b; Dong et al., 2016). Therefore, the precipitation in recharge source areas has increased in recent decades. The recharge rate of groundwater in the southeastern BJD shows a high value after 1950 A.D. (Gates et al., 2008b), which indicates that the groundwater recharge amount of the lakes in the BJD increased (Figure 6E).
Although precipitation is important for lake evolution, evaporation is also an important control on the water balance, especially in arid and semiarid regions (Wu et al., 2020). Modern observations suggest that the evaporation of lakes is closely correlated with air temperature and water temperature in the BJD (Han et al., 2018). Due to the warm island effect of lakes in the BJD, the annual temperature in the lake group region is approximately 1.6°C higher than those in other regions (Liang et al., 2020), which may cause a more intense evaporation effect. When the enhancement of the evaporation effect caused by the temperature rise is much greater than the increased precipitation, the effective moisture decreases (Li et al., 2016; Wu et al., 2020). The salinization of lakes in the BJD at the beginning of the 1950s and the increased temperature simultaneously suggest that the increase in evaporation induced by the temperature rise was greater than that in groundwater recharge (Li et al., 2016; Wu et al., 2020). Wind speed is another important factor for evaporation. Due to the high sand mountains, the wind speed is low in the hinterland of the BJD (Ma and Wang, 2016). The carbonate content has no obvious relationship with the wind speed in the last 60 years but has good consistency with the temperature changes (Figure 7). This phenomenon is consistent with modern instrumental observations (Han et al., 2018).
FIGURE 7. Relationships between the carbonate contents of the SY-2 core (A) and the annual average temperature (B) and wind speed (C) during 1960–2017.
Regionally, tree-ring records suggest that the last dry period was from the beginning of the 1950s to the present in the Hexi Corridor (Deng et al., 2017). In the long term, the drought periods in the Hexi Corridor tend to coincide with solar activity, which may be a possible external driving factor (Figure 6F; Muscheler et al., 2007; Deng et al., 2017). Several lakes in the northeastern Tibetan Plateau have also shown salinization resulting from high temperatures in recent decades, such as Hala Lake (Cao et al., 2007), Sugan Lake (Chen et al., 2009), and Qinghai Lake (Zhang et al., 2004). Furthermore, dry basins or shrinking lakes in the geological period also occurred under the high temperature and precipitation climate in the northeastern Tibetan Plateau and Hexi Corridor (Liu et al., 2013; Wang et al., 2014; Wu et al., 2020). Therefore, for other areas of the world, although there are differences in the timing of temperature increases, they all lead to droughts and extreme events (Hegerl et al., 2018; Neukom et al., 2019; Woolway et al., 2020; Che et al., 2021).
In the context of global warming (Neukom et al., 2019), lake surface water temperatures have increased worldwide at a global average rate of 0.34°C decade−1, and global annual mean lake evaporation rates are forecast to increase 16% by 2,100 relative to 2006–2015 (Woolway et al., 2020). Arid zones are more sensitive than other areas to temperature changes during global climate change, especially desert areas (Chen et al., 2015; Huang et al., 2016; Liang et al., 2020). Remote sensing data show that the lake areas in the BJD and central Asia have decreased in recent decades (Zhang et al., 2013; Che et al., 2021). With ongoing global warming, our results suggest that lakes in arid areas, especially in desert areas, will become increasingly salty, and this issue should have been addressed earlier.
Conclusion
210Pb and 137Cs dating, TOC, TN, and mineral content analysis were used to reconstruct the lake hydrological changes during the past 140 years. From 1880 to 1950, the primary productivity and salinity of Sayinwusu Lake were low. From 1950 to 2018, the TOC, TN, and carbonate minerals increased rapidly at the beginning of the 1950s, indicating that the primary productivity and salinity of the lake increased.
At the beginning of the 1950s, the TOC and TN contents increased synchronously, indicating increases in primary productivity and temperature. Regional climate reconstruction data also suggest that precipitation and temperature have increased in recent decades. However, the enhancement of the evaporation effect caused by the temperature rise is much greater than the increased precipitation in arid areas, especially in desert areas.
Data Availability Statement
The original contributions presented in the study are included in the article/Supplementary Material; further inquiries can be directed to the corresponding authors.
Author Contributions
All authors listed have made substantial, direct, and intellectual contributions to the work and approved it for publication.
Funding
This research was financially supported by the National Natural Science Foundation of China (41807420 and 41871021), the National Key R and D Programme of China (No. 2019YFC0409201), the project of the China Geological Survey (121201106000150093) and the Basic Research Programme of Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences (CAGS) (SK202007).
Conflict of Interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s Note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
Acknowledgments
We are grateful to Li Zhuolun at Lanzhou University and Le Cao, Pucheng Zhu, Jinsong Yang, Dejun Wan, Kai Ning, Min Liu, and other colleagues at the Institute of Hydrogeology and Environmental Geology, CAGS, who have contributed to our field work and data analysis.
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Keywords: lake evolution, groundwater recharge, global warming, evaporation, arid areas
Citation: Jiang G, Wang N, Mao X, Zhao H, Liu L, Shen J, Nie Z and Wang Z (2021) Hydrological Evolution of a Lake Recharged by Groundwater in the Badain Jaran Desert Over the Past 140 years. Front. Earth Sci. 9:721724. doi: 10.3389/feart.2021.721724
Received: 07 June 2021; Accepted: 23 August 2021;
Published: 01 October 2021.
Edited by:
Zhiwei Xu, Nanjing University, ChinaReviewed by:
José Darrozes, UMR5563 Géosciences Environnement Toulouse (GET), FranceLi Wu, Anhui Normal University, China
Steffen Mischke, University of Iceland, Iceland
Copyright © 2021 Jiang, Wang, Mao, Zhao, Liu, Shen, Nie and Wang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Gaolei Jiang, jianggl198899@163.com; Nai’ang Wang, wangna@lzu.edu.cn