增强型植被指数时空变化特征及其驱动机理  

Spatial and temporal variations and thedriving mechanism of the enhanced vegetation index

作　　者：尚雪 何钊全 张铜会 SHANG Xue;HE Zhaoquan;ZHANG Tonghui(Network and Information Center,Yan’an University,Yan’an,Shaanxi 716000,China;School of Life Sciences,Yan’an University,Yan’an,Shaanxi 716000,China;Yan’an Key Laboratory of Ecological Restoration,Yan’an,Shaanxi 716004,China;Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou,Gansu 730000,China)

机构地区：[1]延安大学网络信息中心,陕西延安716000 [2]延安大学生命科学学院,陕西延安716000 [3]延安市生态恢复重点实验室,陕西延安716004 [4]中国科学院西北生态环境资源研究院,甘肃兰州730000

出　　处：《森林与环境学报》2020年第5期478-485,共8页Journal of Forest and Environment

基　　金：国家自然科学基金项目(41371053,30972422,51669034,51809224);国家重点研发计划(2017YFC0506706,2017YFC0504704);博士科学研究启动项目(205040305)。

摘　　要：基于2005—2019年增强型植被指数(EVI)数据,分析陕北地区EVI时空变化特征及其驱动机理。结果表明,2005—2019年,陕北地区植被EVI空间分布差异明显,总体上表现为,东南丘陵沟壑区植被覆盖度较高,西北风沙区及城镇建设用地区域植被覆盖度较低。2005—2019年,各环境因子对EVI的影响程度排序为:年平均降水量>干燥度指数>植被类型>地貌类型>≥10℃积温>土壤类型>坡度>年平均气温>高程>坡向。其中,年平均降水量和干燥度指数的解释力均在40%以上,是影响EVI变化的主要因子。各环境因子对陕北地区EVI变化的影响存在相互增强和非线性增强交互关系。Based on enhanced vegetation index(EVI)data from 2005 to 2019,this study analyzed the spatial and temporal variations,as well as the driving mechanism,of the EVI in northern Shaanxi.The main results were as follows:the spatial distribution of the EVI in northern Shaanxi was significantly different from 2005 to 2019,which generally manifested as higher vegetation coverage in the southeastern hilly and gully region,and lower vegetation coverage in the northwest sandstorm area and urban construction land area.The influence degree of each environmental factor on the EVI from 2005 to 2019 was ranked as:annual precipitation>drought-index>vegetation type>landform type>≥10℃cumulative temperature>soil type>slope>mean temperature>elevation>slope direction.Among them,the explanatory power of the annual precipitation and dryness index was above 40%,and these were the main factors influencing the change in the EVI.The influence of each environmental factor on the EVI in northern Shaanxi was mutually and nonlinearly reinforcing.

关 键 词：增强型植被指数 环境因子 驱动机理 陕北地区 

分 类 号：P901[天文地球—自然地理学]