AUTHOR=Gao Yuan , Shen Lidu , Cai Rongrong , Wang Anzhi , Yuan Fenghui , Wu Jiabing , Guan Dexin , Yao Huaxia 

TITLE=Impact of Forest Canopy Closure on Snow Processes in the Changbai Mountains, Northeast China

JOURNAL=Frontiers in Environmental Science

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/environmental-science/articles/10.3389/fenvs.2022.929309

DOI=10.3389/fenvs.2022.929309

ISSN=2296-665X

ABSTRACT=<p>Forest canopy closure affects snow processes by changing the redistribution of snowfall, snow interception, accumulation, sublimation, and melt. However, how the forest closure impacts snow processes at different periods has not been well explored. We conducted 3-year measurements of snow density and depth and carried out snow process calculations (i.e., interception, sublimation, and snowmelt) from 2018 to 2021 in four mixed forests with different canopy closures and an open site in the Changbai Mountains, northeast China. We found that the snow density of the five study sites varied greatly (0.14–0.45 g/cm<sup>3</sup>). The snow depth (<italic>SD</italic>) at four mixed forests sites was smaller than that of the nearby open site. The <italic>SD</italic> decreased as the forest canopy closure increased. Additionally, the forest interception effect increased with the canopy closure and decreased as the snowfall intensity increased. The total interception efficiency of the four mixed forests in normal snow years changed from 34% to 73% and increased with forest canopy closure. The averaged sublimation rate (<italic>S</italic><sub><italic>s</italic></sub>) and snowmelt rate (<italic>S</italic><sub><italic>r</italic></sub>) of the four mixed forests varied during different periods of snow process. The <italic>S</italic><sub><italic>s</italic></sub> was 0.1–0.4 mm/day during the accumulation period and 0.2–1.0 mm/day during the ablation period, and the <italic>S</italic><sub><italic>r</italic></sub> was 1.5–10.5 mm/day during the ablation period. There was a good correlation between <italic>S</italic><sub><italic>s</italic></sub>, or <italic>S</italic><sub><italic>r</italic></sub>, and canopy closure, but interannual variation was observed in the correlation. The mean values of the effect of the four mixed forests on understory SWE (snow water equivalent) over the 3 years ranged from −45% to −65%. Moreover, the impact effect was correlated with the forest canopy closure and enhanced with the canopy closure. This study provided more scientific information for studies of snow cover response to forest management.</p>