Elevation response of above-ground net primary productivity for Picea crassifolia to climate change in Qilian Mountains of Northwest China based on tree rings

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外文摘要：Current ecosystem models used to simulate global terrestrial carbon balance gener-ally suggest that terrestrial landscapes are stable and mature,but terrestrial net primary productivity(NPP)data estimated without accounting for disturbances in species composition,environment,structure,and ecological characteristics will reduce the accuracy of the global carbon budget.Therefore,the steady-state assumption and neglect of elevation-related changes in forest NPP is a concern.The Qilian Mountains are located in continental climate zone,and vegetation is highly sensitive to climate change.We quantified aboveground bio-mass(AGB)and aboveground net primary productivity(ANPP)sequences at three elevations using field-collected tree rings of Picea crassifolia in Qilian Mountains of Northwest China.The results showed that(1)There were significant differences between AGB and ANPP at the three elevations,and the growth rate of AGB was the highest at the low elevation(55.99 t ha-1 10a-1).(2)There are differences in the response relationship between the ANPP and climate factors at the three elevations,and drought stress is the main climate signal affecting the change of ANPP.(3)Under the future climate scenario,drought stress intensifies,and the predicted de-cline trend of ANPP at the three elevations from mid-century to the end of this century is-0.025 t ha-1 10a-1,respectively;-0.022 t ha-1 10a-1;At-0.246 t ha-1 10a-1,the level of forest produc-tivity was significantly degraded.The results reveal the elevation gradient differences in forest productivity levels and provide key information for studying the carbon sink potential of boreal forests.

外文关键词：

global climate changetree ringaboveground net primary productivityaboveground biomassdrought stressQilian Mountains

作者：

WU Xuan、JIAO Liang、DU Dashi、XUE Ruhong、WEI Mengyuan、ZHANG Peng

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作者单位：

College of Geography and Environment Science,Northwest Normal University,Lanzhou 730070,China

Key Laboratory of Resource Environment and Sustainable Development of Oasis,Northwest Normal Univer-sity,Lanzhou 730070,China

基金：

CAS"Light of West China"ProgramCultivation Program of 2022 Major Scientific Research Project of Northwest Normal UniversityNational Natural Science Foundation of Gansu

项目编号：

2020XBZG-XBQNXZ-AWNU-LKZD2022-0420JR10RA093

出版年：

2024

DOI：

10.1007/s11442-024-2199-x

地理学报(英文版)

中国地理学会,中国科学院地理科学与资源研究所

地理学报(英文版)

CSTPCD

影响因子：1.307

ISSN：1009-637X

年,卷(期)：2024.34(1)