Sensitivity of gross primary production and evapotranspiration to heat and drought stress in a young temperate plantation in northern China  

作　　者：Hongxian Zhao Zeyuan Zhou Feng Zhang Charles P.-A.Bourque Xin Jia Xinhao Li Peng Liu Haiqun Yu Yun Tian Chuan Jin Shaorong Hao Tianshan Zha 

机构地区：[1]State Key Laboratory of Efficient Production of Forest Resources,Beijing Forestry University,Beijing,100083,China [2]School of Soil and Water Conservation,Beijing Forestry University,Beijing,100083,China [3]Beijing Engineering Research Center of Soil and Water Conservation,Beijing Forestry University,Beijing,100083,China [4]Beijing Forestry Carbon Administration,Beijing,100013,China [5]Faculty of Forestry and Environmental Management,University of New Brunswick,28 Dineen Drive,Fredericton,New Brunswick,E3B 5A3,Canada [6]State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,College of Soil and Water Conservation Science and Engineering(Institute of Soil and Water Conservation),Northwest A&F University,Yangling,712100,China [7]School of Ecology,Hainan University,Haikou,570228,China [8]College of Life Sciences,Hebei University,Baoding,071002,China

出　　处：《Forest Ecosystems》2025年第2期177-189,共13页森林生态系统(英文版)

基　　金：supported by the National Key Research and Development Program of China(No.2020YFA0608100);the National Natural Science Foundation of China(NSFC,No.32071842 and 32101588)。

摘　　要：Assessing the sensitivities of ecosystem functions to climatic factors is essential to understanding the response of ecosystems to environmental change.Temperate plantation forests contribute to global greening and climate change mitigation,yet little is known as to the sensitivity of gross primary production(GPP)and evapotranspiration(ET)of these forests to heat and drought stress.Based on near-continuous,eddy-covariance and hydrometeorological data from a young temperate plantation forest in Beijing,China(2012-2019),we used a slidingwindow-fitting technique to assess the seasonal and interannual variation in ecosystem sensitivity(i.e.,calculated slopes,S_(GPP-Ta),S_(ET-Ta),S_(GPP-EF),and S_(ET-EF))in GPP and ET to anomalies in air temperature(T_(a))and evaporative fraction(EF).The EF was used here as an indicator of drought.Seasonally,daily SGPP-Ta,SET-Ta,and SGPP-EF were greatest in summer,reaching maxima of 1.120.56 g C··m^(-2)·d^(-1)·℃^(-1),1.360.56 g H_(2)O·m^(-2)·d^(-1)·℃^(-1),and 0.370.35 g C·m^(-2)·d^(-1),respectively.Evapotranspiration was constrained by drought,especially during the spring-to-summer period,SET-EF reaching0.510.34 g H_(2)O·m^(-2)·d^(-1).Variables EF,T_(a),soil water content(SWC),vapor pressure deficit(VPD),and precipitation(PPT)were the main controls of sensitivity,with SGPP-Ta and SET-Ta increasing with Ta,VPD,and PPT(<50 mm·d^(-1))during both spring and autumn.Increased drought stress during summer caused the positive response in GPP and ET to decrease with atmospheric warming.Variable SET-EF intensified(i.e.,became more negative)with decreasing EF and increasing Ta.Interannually,annual S_(GPP-Ta)and S_(ET-Ta)were positive,S_(GPP-EF)near-neutral,and S_(ET-EF)negative.Interannual variability in S_(GPP-Ta),S_(ET-Ta),S_(ET-EF),and S_(GPP-EF)was largely due to variations in bulk surface conductance.Our study suggests that the dynamics associated with the sensitivity of ecosystems to changes in climatic factors need to be considered in the management of plantation forests u

关 键 词：Climate change EVAPOTRANSPIRATION Forest plantation Gross primary production Heat and drought stress Ecosystem sensitivity 

分 类 号：S718.5[农业科学—林学]