青藏高原植被光能利用效率时空变化  

Spatial-temporal dynamics of vegetation light use efficiency and its driving factors on the Qinghai-Xizang Plateau

作　　者：其美拉姆 郑诚 袁浏欢 吴沛桐 谭凯 申乔天 史海静[3,4] QIMEI Lamu;ZHENG Cheng;YUAN Liuhuan;WU Peitong;TAN Kai;SHEN Qiaotian;SHI Haijing(Agriculture and Rural Affairs Bureau of Qushui County,Lhasa 850699,Xizang,China;College of Grassland Agriculture,Northwest A&F University,Yangling 712100,Shaanxi,China;Institute of Soil and Water Conservation,Northwest A&F University,Yangling 712100,Shaanxi,China;Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling 712100,Shaanxi,China)

机构地区：[1]西藏拉萨市曲水县农业农村局,西藏拉萨850699 [2]西北农林科技大学草业与草原学院,陕西杨凌712100 [3]西北农林科技大学水土保持研究所,陕西杨凌712100 [4]中国科学院水土保持与生态环境研究中心,陕西杨凌712100

出　　处：《干旱区研究》2024年第10期1731-1739,共9页Arid Zone Research

基　　金：国家自然科学基金项目(41501055);国家科技基础条件平台建设项目(2005DKA2300)。

摘　　要：研究青藏高原植被光能利用效率(Light Use Efficiency,LUE)时空变化特征对确定陆地生态系统碳汇和未来功能维持具有重要的生态价值和现实意义。本研究利用1982—2018年GLASS数据以及气候数据,采用趋势分析和偏相关分析方法,探究了青藏高原植被光能利用效率年际动态变化特征及其与温度、降雨、饱和水汽压差(Va⁃por Pressure Deficit,VPD)和太阳辐射的关系。结果表明:(1)1982—2018年,青藏高原植被生态系统LUE总体上呈显著线性增长趋势,增长速率为3.16×10^(-3)g C·MJ^(-1)·a^(-1)。(2)青藏高原植被生态系统LUE空间分布具有较强的异质性,表现为由西向东递增的空间分布格局。由趋势分析结果可知,中部和东北部地区LUE年际增长趋势明显。(3)相较降水和VPD等因子,温度与植被LUE年际变化的关系更为密切。本研究成果能够为揭示青藏高原植被生态系统对气候变化的响应提供依据。Investigating the spatial-temporal variation characteristics of vegetation light-use efficiency on the Qinghai-Xizang Plateau has important ecological value and practical significance for determining the carbon sink and future function maintenance of terrestrial ecosystems.This study was conducted to explore the interannual dynamic variation characteristics of vegetation light-use efficiency on the Qinghai-Xizang Plateau and its relationship with temperature,rainfall,VPD,and solar radiation using GLASS data and climate data from 1982 to 2018 and trend analysis and partial correlation analysis methods.Results showed that(1)From 1982 to 2018,the LUE of the Qinghai-Xizang Plateau vegetation ecosystem generally exhibited a significant linear growth trend,with a growth rate of 3.16×10^(−3)g C·MJ^(−1)·a^(−1).(2)The spatial distribution of LUE in the Qinghai-Xizang Plateau vegetation ecosystem had strong spatial heterogeneity,exhibiting an increasing spatial trend from west to east.The trend analysis revealed an obvious interannual growth trend of LUE in the central and northeastern regions.(3)Temperature was more closely related to interannual changes in the LUE of vegetation than factors such as precipitation and VPD.This study provides a basis for revealing the response of the Qinghai-Xizang Plateau vegetation ecosystem to climate change.

关 键 词：植被 光能利用效率 气候因子 时空动态 青藏高原 

分 类 号：Q948[生物学—植物学]