文献类型：期刊文献

英文题名：Carbon fluxes and water-use efficiency in a Pinus tabuliformis plantation in Northeast China and their relationship to drought

作者：Gao, Xiang[1,2,3] Sun, Shoujia[1,2,3] Meng, Ping[1,2,3] Cai, Jinfeng[2] Pei, Songyi[4] Huang, Hui[1,2,3] Zhang, Jinsong[1,2,3]

第一作者：Gao, Xiang;高翔

通信作者：Zhang, JS[1]

机构：[1]Chinese Acad Forestry, Key Lab Tree Breeding & Cultivat, Natl Forestry & Grassland Adm, Res Inst Forestry, Beijing 100091, Peoples R China;[2]Nanjing Forest Univ, Coinnovat Ctr Sustainable Forestry Southern China, Nanjing 210037, Jiangsu, Peoples R China;[3]Henan Commun Vocat Technol Coll, Zhengzhou 450015, Henan, Peoples R China;[4]Chaoyang Teachers Coll, Chaoyang City 122000, Liaoning, Peoples R China

年份：2024

卷号：946

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20242716605467);Scopus(收录号：2-s2.0-85197102351);WOS:【SCI-EXPANDED(收录号:WOS:001264301200001)】；

基金：This project was supported financially by the Fundamental Research Funds for the Central Nonprofit Research Institution of CAF (CAFYBB2022SY001) and the National Natural Science Foundation of China (32301662) . The Henan Xiaolangdi Forest Ecosystem National Observation and Research Station provided biophysical sensors and an eddy covariance system.

语种：英文

外文关键词：Carbon fluxes; Water-use efficiency; Drought; Pinus tabuliformis plantation

摘要：The impact of extreme weather events on carbon fluxes and water-use efficiency (WUE) in revegetated areas under water-limited conditions is poorly understood. We analyzed changes in carbon fluxes and WUE over three years of eddy-covariance measurements in a Pinus tabuliformis plantation in Northeast China to investigate carbon fluxes and WUE responses to drought events at different time scales. Mean annual net ecosystem exchange (NEE), gross primary production (GPP), and ecosystem respiration (Re) were -368.48, 1042.42, and 673.94 g C m - 2 , respectively. Drought events increased NEE, as GPP was more sensitive to water stress than Re at different growing stages. Mean annual WUE was 2.46 g C kg -1 H 2 O, and plant phenology played a key role in WUE responses to drought. Water stress had negative and positive effects on daily WUE at the early and late growing stages, respectively, and daily WUE was generally insensitive to drought at the mid growing stage. A lagged effect existed in the carbon fluxes and WUE dynamics after drought events at various time scales. Water stress at the early growing stage was more important than that at other growing stages on annual carbon sequestration and WUE, as it dominated canopy growth in the current year. The annual mean normalized difference vegetation index controlled interannual variations in carbon fluxes and WUE in the plantation. Our findings contribute to the prediction of possible changes in carbon and water fluxes under climate warming in the afforested areas of Northeast China.