藏东南植被碳利用效率的时空变化与生态网络构建  

Spatiotemporal Variation of Carbon Utilization Efficiency and Ecological Network Construction of Vegetation in Southeastern Xizang

作　　者：卢杰[1,2,3] 施奇 韩嘉华 于强 LU Jie;SHI Qi;HAN Jiahua;YU Qiang(Institute of Xizang Plateau Ecology,Xizang Agricultural and Animal Husbandry University;Key Laboratory of Forest Ecology on Xizang Plateau Xizang Agricultural and Animal Husbandry University,Ministry of Education;Key Laboratory of Alpine Vegetation Ecological Security in Xizang,Linzhi,Xizang,860000;School of Ecology and Environment,Xizang University,Lasa,Xizang,850000;College of Forestry,Beijing Forestry University,Beijing,100083,China)

机构地区：[1]西藏农牧学院高原生态研究所 [2]西藏高原森林生态教育部重点实验室 [3]西藏自治区高寒植被生态安全重点实验室,西藏林芝860000 [4]西藏大学生态环境学院,西藏拉萨850000 [5]北京林业大学林学院,北京100083

出　　处：《高原农业》2025年第1期1-15,64,F0002,共17页Journal of Plateau Agriculture

基　　金：西藏农牧学院学术名师支持计划(XZNMXYRCDWJS-2024-05);西藏高原森林生态教育部重点实验室开放课题(XZA-JYBSYS-2023-04)。

摘　　要：碳循环在全球生态系统中起着至关重要的作用,碳循环的反馈效应将对未来的气候变化具有重要影响。本研究以西藏地区东南部(林芝市和昌都市)为研究区域,以相应月份和年份MOD17A2HGF GPP,MOD17A2HGF PSN_(net)数据为主要数据源,探讨时空变化格局,并结合气象数据对藏东南植被CUE进行相应系统分析,还建立一个生态网络来研究CUE变化对生态系统稳定性的影响。研究结果表明:月尺度上,区域CUE随生长季变化明显,变异规律在不同植被类型中有所差异。年尺度上,CUE整体呈现不显著的上升趋势,但2019-2022年CUE波动幅度加大。藏东南CUE随温度和降水变化,且温度对CUE变化更显著,相关性较强。气温和降水对藏东南区域CUE变化趋势呈现相反的现象。藏东南地区生态节点和廊道的数量逐年减少,需要添加生态垫脚石增加生态源地,减少生态廊道提高藏东南生态系统稳定。藏东南生态源区CUE的变化对整个生态系统的影响尤为显著。The carbon cycle plays a crucial role in the global ecosystem,and the feedback effects of the carbon cycle have significant impacts on future climate change.This study focused on the southeastern region of the Xizang Autonomous Region(Linzhi and Changdu)as the research area.Using MOD17A2HGF GPP and MOD17A2HGF PSN_(net) data for the corresponding months and years as the primary data sources,the study explored spatiotemporal variation patterns and systematically analyzed the changes in vegetation CUE(Carbon Utilization Efficiency)in southeastern Xizang in relation to meteorological data.Furthermore,an ecological network was constructed to investigate the impact of CUE changes on the stability of the ecosystem.The results were as follows:On a monthly scale,the regional CUE showed significant variation with the growing season,with differing patterns of variation across different vegetation types.On an annual scale,CUE showed an overall non-significant upward trend,but fluctuations increased between 2019 and 2022.CUE in southeastern Xizang varied with changes in temperature and precipitation,with temperature having a more significant and stronger correlation with CUE changes.Temperature and precipitation exhibited opposite trends in their effects on CUE in this region.The number of ecological nodes and corridors in southeastern Xizang had decreased annually,indicating a need for additional ecological stepping stones to increase ecological source areas and reduce ecological corridors,thereby enhancing the stability of the southeastern Xizang ecosystem.The changes in CUE within the ecological source areas of southeastern Xizang had particularly notable impacts on the entire ecosystem.

关 键 词：藏东南 碳利用效率 时空变化 网络构建 

分 类 号：Q948[生物学—植物学]