文献类型：期刊文献

英文题名：Evaluation of water use efficiency model in evapotranspiration partitioning from high-frequency eddy covariance data-a comparison between plantation sites

作者：Wang, Xin[1,2] Li, Zhipeng[1,2] Zhou, Yu[1,2] Wang, Yiheng[1,2] Ahmad, Sarir[4] Hu, Meijun[1,2] Sun, Shoujia[1,2,3] Huang, Hui[1,2,3] Zhang, Jinsong[1,2] Zhai, Lihai[5]

第一作者：Wang, Xin

通信作者：Li, ZP[1];Zhang, JS[1]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, Key Lab Tree Breeding & Cultivat, Natl Forestry & Grassland Adm, Beijing 100091, Peoples R China;[2]Henan Xiaolangdi Forest Ecosyst Natl Observat & Re, Jiyuan 454650, Peoples R China;[3]Nanjing Forest Univ, Collaborat Innovat Ctr Sustainable Forestry Southe, Nanjing 210037, Peoples R China;[4]Univ Agr Dera Ismail Khan, Khyber Akhtunkhwa, Pakistan;[5]State Owned Nanshan Forest Farm Jiyuan City, Jiyuan 459000, Henan, Peoples R China

年份：2025

卷号：372

外文期刊名：AGRICULTURAL AND FOREST METEOROLOGY

收录：;Scopus(收录号：2-s2.0-105006836332);WOS:【SCI-EXPANDED(收录号:WOS:001503802300002)】；

基金：The authors would like to thank the anonymous reviewers for their valuable comments and suggestions. The research was supported by the National Nonprofit Institute Research Grant of the Chinese Academy of Forestry (Grant No CAFYBB2022ZA00102) and the National Nonprofit Institute Research Grant of the Chinese Academy of Forestry (Grant No CAFYBB2023MA001) . We thank Zhipeng Li (Research Institute of Forestry, Chinese Academy of Forestry, Beijing, China) and Yu Zhou (Jining Polytechnic, Jining, China) for their technical support in ecosystem level eddy covariance data collection. The authors gratefully thank Dr. Todd Skaggs for providing the FVS code and Dr. Sarir Ahmad for helping with English editing and proofreading.

语种：英文

外文关键词：Flux partitioning; Water use efficiency; Soil moisture; Forest

摘要：Water use efficiency (WUE) represents a crucial parameter and a major source of error influencing the accuracy of evapotranspiration separation through flux variance similarity (FVS). However, there is a paucity of studies investigating the application of FVS for the separation of evapotranspiration across multiple plantations, thereby constraining our understanding of water use strategies in plantation forests. This study assessed the outcomes of four intercellular carbon dioxide models and an optimization model (Opt) within the FVS framework, utilizing Eddy Covariance (EC) data gathered from two broad-leaf plantations and four coniferous plantations. Additionally, we examined the relationship between WUE and solution rate, as well as the responsiveness of the proportion of transpiration to evapotranspiration (T:ET) to soil moisture. The results showed that the solution rate of the Sqrt model differed by only 1 %- 2 % from the constant Ci value (Ci) and the constant Ci/Ca ratio (K) model in plantations, excluding Pinus tabuliformis. Moreover, the Sqrt model exhibited an average overestimation of T:ET by 8 % compared to the Opt model. The solution rate of Ci, K, and Sqrt models were decreased with an increase in WUE. At a half-hour scale and daily scale, the plantation's solution rate was ranged from 39 % to 67 %, and 29 % to 76 %, respectively. Except for the Linear model, all other models effectively tracked the dynamic changes in soil moisture. This study enhanced our understanding about the distinctions and consistencies in FVS separation among five WUE models in plantations, providing a foundation for the selection of WUE models to elucidate water use strategies in plantations.