Seasonal variations in the transpiration-to-evapotranspiration ratio and their driving forces in China's terrestrial ecosystem during 1981–2021  

1981-2021年中国陆地生态系统蒸腾蒸散比的季节变化及其影响因素

作　　者：WANG Bin NIU Zhongen FENG Lili ZENG Na GE Rong FAN Jiayi 王彬;牛忠恩;冯莉莉;曾纳;葛蓉;樊珈奕

机构地区：[1]School of Resources and Environmental Engineering,Ludong University,Yantai 264025,Shandong,China [2]College of Hydraulic and Civil Engineering,Ludong University,Yantai 264025,Shandong,China [3]Research Institute of Forestry,Chinese Academy of Forestry,Beijing 100091,China [4]School of Environment and Resources,Zhejiang A&F University,Hangzhou 311300,China [5]Institute of Natural Resources and Environmental Audits,School of Government Audit,Nanjing Audit University,Nanjing 211815,China

出　　处：《Journal of Geographical Sciences》2025年第4期699-715,共17页地理学报(英文版)

基　　金：National Natural Science Foundation of China,No.42201312,No.42301538;Natural Science Foundation of Shandong Province,No.ZR2022QD118。

摘　　要：The transpiration-to-evapotranspiration ratio(T/ET)is a crucial indicator of the carbon-water cycle and energy balance.Despite the marked seasonality of warming and greening patterns,the differential responses of T/ET to environmental changes across the seasons remain unclear.To address this,we employed a model-data fusion method,integrating the Priestley–Taylor Jet Propulsion Lab model with observational datasets,to analyze the seasonal trends of T/ET in China’s terrestrial ecosystems from 1981 to 2021.The results showed that T/ET significantly increased in spring,summer,and autumn,with growth rates of 0.0018 a^(–1)(p<0.01),0.0024 a^(–1)(p<0.01),and 0.0013 a^(–1)(p<0.01),respectively,whereas the winter trends remained statistically insignificant throughout the study period.Leaf area index dynamics were identified as the primary driver of the increase in T/ET during summer,accounting for 79%of the trend.By contrast,climate change was the main contributor to the rising T/ET trends in spring and autumn,accounting for 72%and 77%of the T/ET increase,respectively.Additionally,warming is pivotal for climate-driven changes in T/ET trends.This study elucidated seasonal variations in T/ET responses to environmental factors,offering critical insights for the sustainable management of ecosystems and accurate prediction of future environmental change impacts.

关 键 词：transpiration-to-evapotranspiration ratio seasonal dynamics PT-JPL model China's terrestrial ecosystems 

分 类 号：P467[天文地球—大气科学及气象学]