首页|Effect of climate change on seasonal water use efficiency in subalpine Abies fabri

Effect of climate change on seasonal water use efficiency in subalpine Abies fabri

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Abies fabri is a typical subalpine dark coniferous forest in southwestern China.Air temperature increases more at high elevation areas than that at low elevation areas in mountainous regions,and climate change ratio is also uneven in different seasons.Carbon gain and the response of water use efficiency (WUE) to annual and seasonal increases in temperature with or without CO2 fertilization were simulated in Abies fabri using the atmospheric-vegetation interaction model (AVIM2).Four future climate scenarios (RCP2.6,RCP4.5,RCP6.o and RCP8.5) from the Coupled Model Intercomparison Project Phase 5 (CMIP5) were selectively investigated.The results showed that warmer temperatures have negative effects on gross primary production (GPP) and net primary production (NPP) in growing seasons and positive effects in dormant seasons due to the variation in the leaf area index.Warmer temperatures tend to generate lower canopy WUE and higher ecosystem WUE in Abies fabri.However,warmer temperature together with rising CO2 concentrations significantly increase the GPP and NPP in both growing and dormant seasons and enhance WUE in annual and dormant seasons because of the higher leaf area index (LAI) and soil temperature.The comparison of the simulated results with and without CO2 fertilization shows that CO2 has the potential to partially alleviate the adverse effects of climate warming on carbon gain and WUE in subalpine coniferous forests.

Climate changeCarbon gainWater use efficiencyAtmospheric-vegetation interaction model

SUN Xiang-yang、WANG Gen-xu、HUANG Mei、HU Zhao-yong、SONG Chun-lin

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Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China

Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101

This study was supported by the Natural Science Foundation of ChinaThis study was supported by the Natural Science Foundation of Chinakey research projects of frontier sciences CASChinese Academy of Science (‘West Star’ project)CAS/SAFEA international partnership program for creative research teams

4140104441310013QYZDJ-SSW-DQC006KZZD-EW-TZ-06

2017

10.1007/s11629-016-3867-9

山地科学学报(英文版)
中国科学院水利部成都山地灾害与环境研究所

山地科学学报(英文版)

CSTPCDCSCDSCI
影响因子：0.228
ISSN：1672-6316
年,卷(期)：2017.14(1)
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