文献类型：期刊文献

中文题名：Hot temperature extremes and vapor pressure deficits co-explain changes in the timing of peak photosynthetic activity in the forest belt of northeast China

作者：Yu Zhang[1,2] Zhen Yu[3] Junwei Luan[1] Yi Wang[1] Xiaodan Ye[1] Shirong Liu[2]

第一作者：Yu Zhang;张宇

机构：[1]Institute of Resources and Environment,International Centre for Bamboo and Rattan,Key Laboratory of Bamboo&Rattan Science and Technology of National Forestry and Grassland Administration,Beijing 100102,People’s Republic of China;[2]Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration,Ecology and Nature Conservation Institute,Chinese Academy of Forestry,Beijing 100091,People’s Republic of China;[3]School of Applied Meteorology,Nanjing University of Information Science and Technology,Nanjing 210044,People’s Republic of China

年份：2025

卷号：36

期号：5

起止页码：8-22

中文期刊名：Journal of Forestry Research

外文期刊名：林业研究(英文版)

基金：supported by the National Key R&D Program of China(2021YFD2200405);the National Natural Science Foundationof China(Nos.U23A2002,31930078,and 31670450);the Fundamental Research Funds for ICBR(1632021023,1632019006,and1630032023002).

语种：英文

中文关键词：Peak photosynthetic activity;Climate change;Hot extremes;Leaf area index;Solar-induced chlorophyll fluorescence

分类号：S718.5

摘要：Climate changes in cold-temperate zones are increasingly altering the state of climatic constraints on photosynthesis and growth,leading to adaptive changes in plant phenology and subsequent seasonal carbon assimilation.However,the spatio-temporal patterns of climatic constraints and seasonal carbon assimilation are poorly understood.In this study,the timing of peak photosynthetic activity(DOY_(pmax))was employed as a proxy for plant adap-tive state to climatic constraints on growth to examine the spatio-temporal dynamics of DOY_(pmax).By using multiple remote sensing metrics,DOY_(pmax)was characterized with changes in the solar-induced chlorophyll fluorescence(SIF)and leaf area index(LAI)from 2000 to 2018.Based on SIF,the DOY_(pmax)was generally around day 190,while based on LAI was about 10 d later.Peak photosynthetic activity of forests occurs earlier compared to other vegetation types.Overall,the advanced DOY_(pmax)were observed based on both SIF and LAI,with annual rates of 0.2(P=0.31)and 0.3(P<0.05)d,respectively.DOY_(pmax)dynamics were influ-enced by hot temperature extremes and vapor pressure defi-cits(VPD)during the early growing season,regardless of sub-zone and different vegetation type.The generalized lin-ear mixed model(GLMM)showed the largest contribution by hot extremes to DOY_(pmax)dynamics accounted for 55.5%(DOY_(pmax_SIF))and 49.1%(DOY_(pmax_LAI)),respectively,fol-lowed by VPD(DOY_(pmax_SIF):23.1%;DOY_(pmax_LAI):29.5%).These findings highlight the crucial role of climate extremes in shaping seasonal carbon dynamics and regional carbon balance.