塔里木盆地南缘植被NPP时空变化特征及驱动因素——以和田地区为例  

Spatio⁃temporal variations and driving factors of vegetation NPP at the southern edge of Tarim Basin:A case study of Hotan area

作　　者：沈文婕 王双成 刘溢 张晓凡 刘勤[3] 郑天亮 杨晴雯[1] 裴向军[1,4] 李景吉[1,4] SHEN Wen-jie;WANG Shuang-cheng;LIU Yi;ZHANG Xiao-fan;LIU Qin;ZHENG Tian-liang;YANG Qing-wen;PEI Xiang-jun;LI Jing-ji(College of Ecology and Environment,Chengdu University of Technology,Chengdu 610059,China;Hydrogeological and Engineering Geological Team of Xinjiang Bureau of Geo-Exploration&Mineral Development,Changji,Xinjiang 831100,China;Institute of Mountain Hazards and Environment,Chinese Academy of Science,Chengdu 610041,China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]成都理工大学生态环境学院,成都610059 [2]新疆维吾尔自治区地质矿产勘查开发局第二水文工程地质大队,新疆昌吉831100 [3]中国科学院水利部成都山地灾害与环境研究所,成都610041 [4]成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都610059

出　　处：《西南农业学报》2023年第10期2108-2115,共8页Southwest China Journal of Agricultural Sciences

基　　金：国家重点研发项目(2019QZKK0307);新疆维吾尔自治区地质矿产勘查开发局地质勘查项目(XGMB202356)。

摘　　要：【目的】研究干旱荒漠区植被净初级生产力(Net Primary Productivity,NPP)时空变化特征及驱动因素,为揭示敏感区植被变化驱动机制提供科学依据。【方法】基于MOD17A3数据,运用趋势分析、变异系数和相关性分析等方法,探讨2000—2020年和田地区植被NPP时空变化特征及驱动因素。【结果】①2000—2020年和田地区植被NPP整体呈波动增加趋势,空间上呈“条带”分布特征。②95.90%植被区域NPP变化斜率大于0,植被整体呈改善趋势;植被NPP波动程度较高,整体稳定性较低。③和田地区植被NPP与降水呈正相关,与气温呈弱负相关的特征明显;67.51%植被区域NPP受非气候因素驱动;气候因素驱动中,降水对植被NPP的驱动作用强于气温。④和田地区整体呈裸地、灌丛减少,草地、永久性冰雪、耕地和水体增加的变化特征,土地利用类型间的转移对植被NPP以促进作用为主;裸地转变为草地是近二十年来研究区最主要的土地利用转移方向,变化区域植被NPP多呈上升趋势。【结论】植被NPP变化受气候因素和人类活动的综合影响,生态工程对植被的积极作用是和田地区植被NPP增加的主要原因。【Objective】The study aimed to analyze the spatial and temporal changes of NPP and its drivers in arid desert areas to provide sci⁃entific evidence for revealing the mechanism of vegetation change in sensitive areas.【Method】Based on MOD17A3 data,the trend analysis,coefficient of variation and correlation analysis were used to investigate the characteristics of spatial and temporal changes in NPP and its driv⁃ers in Hotan area from 2000 to 2020.【Result】(i)From 2000 to 2020,the NPP in Hotan area showed an overall trend of fluctuation and in⁃crease,with a spatial distribution of‘strips’.(ii)The variation trend of NPP was improved with 95.90%of the vegetated areas greater than zero,with higher volatility and lower stability in NPP.(iii)NPP in Hotan area showed a positive correlation with precipitation and a weak negative correlation with temperature,and the 67.51%of NPP in vegetated areas driving by non⁃climatic factors,with the precipitation playing a stronger role than temperature among the climatic factors.(iv)Changes in land use types showed a decrease in barren and scrubland and an increase in grassland,permanent snow and ice,cropland and water bodies,with shifts between land use types having a predominantly positive effect on NPP.In two decades,the conversion of barren land to grassland was the most important direction of land use transfer in Hotan area,and the vegetation NPP mostly showed an increasing trend in this area.【Conclusion】The changes in NPP were influenced by a combination of climatic factors and human activities,and the positive effect of ecological engineering on vegetation was the main reason for the increase in NPP in Hotan area.

关 键 词：净初级生产力(NPP) 气候变化 驱动因子 MOD17A3 和田地区 

分 类 号：S181[农业科学—农业基础科学]