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ORIGINAL RESEARCH article
Front. Environ. Sci.
Sec. Drylands
Volume 12 - 2024 |
doi: 10.3389/fenvs.2024.1397704
Estimation of latent heat flux of pasture and maize in arid region of Northwest China based on canopy resistance modeling
Provisionally accepted- 1 Jiangsu University, Zhenjiang, China
- 2 China Institute of Water Resources and Hydropower Research, Beijing, Beijing Municipality, China
- 3 Nanjing Hydraulic Research Institute, Nanjing, Jiangsu Province, China
Estimating the latent heat flux (λET) accurately is important for water-saving irrigation in arid regions of Northwest China. The Penman-Monteith model is a commonly used method for estimating λET, but the parameterization of canopy resistance in the model has been a difficulty in research. In this study, continuous observation of λET during the growing period of maize and grassland in Northwest China was conducted based on the Bowen ratio energy balance (BREB) method and the Eddy covariance system (ECS). Two methods, Katerji-Perrier (K-P) and Garcıá-Santos (G-A), were used to determine the canopy resistance in the Penman-Monteith model and the estimation errors and causes of the two sub-models were explored. The results indicated that both models underestimated the λET of grassland and maize. The K-P model performed relatively well (R 2 > 0.94), with the root mean square errors (RMSE) equaled 37.3 W/m 2 and 28.1 W/m 2 for grass and maize, respectively. The accuracy of the G-A model was slightly lower than that of the K-P model, with the determination coefficient (R 2 ) equaled 0.90 and 0.92, and the RMSE equaled 46.2 W/m 2 (grass) and 42.1 W/m 2 (maize). The vapor pressure deficit (VPD) was the main factor affecting the accuracy of K-P and G-A sub-models. The error of two models increased with the increasing in VPD for both crops.
Keywords: grassland, Maize, heat flux, Northwest region, Penman-Monteith model
Received: 10 Apr 2024; Accepted: 22 Jul 2024.
Copyright: © 2024 Wang, Yan, Zheng, Wu, Tian, Zhang, Zhu, Wang, Lakhiar and Liu. 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) or licensor 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:
Haofang Yan, Jiangsu University, Zhenjiang, China
Hexiang Zheng, China Institute of Water Resources and Hydropower Research, Beijing, 100038, Beijing Municipality, China
Jiabin Wu, China Institute of Water Resources and Hydropower Research, Beijing, 100038, Beijing Municipality, China
Delong Tian, China Institute of Water Resources and Hydropower Research, Beijing, 100038, Beijing Municipality, China
Chuan Zhang, Jiangsu University, Zhenjiang, China
Xingye Zhu, Jiangsu University, Zhenjiang, China
Youwei Liu, Jiangsu University, Zhenjiang, China
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