青藏高原干旱荒漠地区叶面积指数时空变化及影响因素  

Spatiotemporal variation and influencing factors of leaf area index in the arid desert area of the Qinghai-Tibet Plateau

作　　者：郭玉超 任鸿瑞[1] GUO Yuchao;REN Hongrui(Department of Geomatics,Taiyuan University of Technology,030024,Taiyuan,China)

机构地区：[1]太原理工大学测绘科学与技术系,太原030024

出　　处：《中国水土保持科学》2023年第5期38-50,共13页Science of Soil and Water Conservation

基　　金：第二次青藏高原综合科学考察研究项目“西风季风协同作用及其环境效应”(2019QZKK0106)。

摘　　要：探索青藏高原干旱荒漠地区植被生长状况及其影响因素,以期为该地区生态环境治理、可持续发展及环境保护提供参考。基于GLASS LAI数据,辅助气候、地形、社会等因子,采用最大值合成法、趋势分析法、变异系数法与偏相关分析法,分析1981—2018年青藏高原干旱荒漠地区植被叶面积指数(LAI)时空变化格局。结果表明:1)植被LAI在这38 a间呈显著增加趋势(P<0.05),有64.85%的区域趋于增长,35.15%的区域趋于退化;2)不同海拔区间植被LAI变化特征有所差异,海拔≤2000 m呈不显著降低趋势(P>0.05),海拔>2000 m均呈显著增加趋势(P<0.05),其波动程度在海拔>6000 m及海拔≤2000 m区间更高;3)植被LAI与气温、降水呈正相关区域所占比例分别为63.93%和52.72%,其中通过显著性检验区域比例分别为11.56%和4.45%,气温与降水相比对植被LAI变化影响更为显著。1981—2018年间,研究区气候逐渐向暖湿化方向转变,对植被生长产生积极影响。经济发展、人口数量上升给该区植被覆盖带来一定负面影响,体现在土地利用变化上主要显示为草地退化、未利用土地扩张的特征。[Background]Ecological environment in the arid desert area of the Qinghai-Tibet Plateau is fragile,anti-interference ability is low and vegetation growth is easily affected by external conditions.Under the influence of climate change characterized by global warming and encroachment from human grazing,construction and other activities,problems such as the decline of grassland productivity and the expansion of decertified land area have become increasingly apparent in this area.In this context,it is urgent to study the temporal and spatial distribution of vegetation cover and its change characteristics in this area,and monitoring vegetation growth by remote sensing data is of great significance for regional desertification control,land sustainable utilization and ecological environment protection.[Methods]Based on global land surface satellite(GLASS)LAI data and auxiliary factors such as temperature,precipitation,topography,population(POP)and gross domestic product(GDP),this study used maximum synthesis method,trend analysis method,coefficient of variation method and partial correlation analysis method to explore the spatiotemporal variation of vegetation LAI and its relationship with temperature and precipitation in the arid desert area of the Qinghai-Tibet Plateau(including 4 physical regions:H1D1:Kunlun high mountain and plateau alpine desert region.H2D1:Qaidam Basin desert region.H2D2:Kunlun mountain north desert region.H2D3:Ngali mountain desert region)from 1981 to 2018.At the same time,the influence of POP and GDP change on land use and vegetation cover were analyzed.[Results]The spatial distribution of LAI of vegetation was generally low and showed a significant increasing trend during the past 38 years(P<0.05).In the study area,64.85%of areas tended to increase and 35.15%of areas tended to degenerate.In these four physical regions,the LAI distribution of vegetation from high to low was H2D3,H2D2,H2D1 and H1D1.2)There were differences in LAI change characteristics of vegetation at different altitude ranges,s

关 键 词：叶面积指数 变化格局 干旱荒漠地区 青藏高原 

分 类 号：Q948[生物学—植物学] TP79[自动化与计算机技术—检测技术与自动化装置]