首页|Divergent contributions of spring and autumn photosynthetic phenology to seasonal carbon uptake of subtropical vegetation in China
Divergent contributions of spring and autumn photosynthetic phenology to seasonal carbon uptake of subtropical vegetation in China
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Phenological changes play a central role in regulating seasonal variation in the ecological processes,exerting significant impacts on hydrologic and nutrient cycles,and ul-timately influencing ecosystem functioning such as carbon uptake.However,the potential impact mechanisms of phenological events on seasonal carbon dynamics in subtropical re-gions are under-investigated.These knowledge gaps hinder from accurately linking photo-synthetic phenology and carbon sequestration capacity.Using chlorophyll fluorescence re-mote sensing and productivity data from 2000 to 2019,we found that an advancement in spring phenology increased spring gross(GPP)and net primary productivity(NPP)in sub-tropical vegetation of China by 2.1 gC m-2 yr-1 and 1.4 gC m-2 yr-1,respectively.A delay in autumn phenology increased the autumnal GPP and NPP by 0.4 gC m-2 yr1 and 0.2 gC m-2 yr-1,respectively.Temporally,the contribution of the spring phenology to spring carbon uptake increased significantly during the study period,while this positive contribution showed a non-significant trend in summer.In comparison,the later autumn phenology could significantly contribute to the increase in autumnal carbon uptake;however,this contributing effect was weakened.Path analysis indicated that these phenomena have been caused by the in-creased leaf area and enhanced photosynthesis due to earlier spring and later autumn phenology,respectively.Our results demonstrate the diverse impacts of vegetation phe-nology on the seasonal carbon sequestration ability and it is imperative to consider such asymmetric effects when modeling ecosystem processes parameterized under future cli-mate change.
School of Geographic Sciences,Hunan Normal University,Changsha 410081,China
Department for Biogeochemical Integration,Max-Planck-Institute for Biogeochemistry,Jena 07745,Germany
Department of Biology Sciences,Institute of Environment Sciences,University of Quebec at Montreal,C.P.8888,Succ.Centre-Ville,Montreal H3C 3P8,Canada
National Natural Science Foundation of ChinaJoint Fund for Regional Innovation and Development of the National Natural Science Foundation of ChinaScience and Technology Innovation Program of Hunan Province,China
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