摘要
基于2000—2020年MODIS增强型植被指数数据,采用趋势分析、变异系数等方法分析广西21年EVI值时空变化趋势,并利用地理探测器模型对广西植被覆盖的驱动机制进行了研究。结果表明,2000—2020年广西植被覆盖整体呈现稳中有升的趋势,多年平均EVI值为0.399 3。广西植被改善区域面积为55.92%,主要分布于研究区中部和南部;区域空间上,EVI值主要表示为低波动变化,低波动区域面积占比为84.16%。9个环境因子对EVI值的解释力从大到小依次是植被类型>地貌类型>GDP>人口>坡度>高程>土壤类型>气温>降水量,环境因子两两相互作用,均为非线性增强交互关系。
Based on the MODIS Enhanced Vegetation Index(EVI)data from 2000 to 2020,the method of trend analysis,and coefficient of variation were used to analyze the temporal and spatial trends of EVI vegetation index in Guangxi Province for 21 years.The driving mechanism of EVI vegetation index in Guangxi Province was studied by using the Geographic detector model.The results showed that:Overall,the EVI vegetation index showed an upward trend in the last 21 years,the multi-year average value of EVI vegetation index is 0.3993.The area of vegetation improvement accounted for 55.92%of the total area of the Guangxi,which is mainly distributed in the middle and south of the study area;Spatially,the EVI vegetation index is mainly expressed as low fluctuation,and the area of low fluctuation area accounts for 84.16%.The influence degree of nine environmental factors on the EVI was ranked as:vegetation>geomorphic type>GDP>population>slope>altitude>soil type>temperature>precipitation.The correlation between those environmental factors showed as non-linear enhanced interactions.
作者
陈丽梅
莫婷婷
CHEN Li-mei;MO Ting-ting(Guangxi Institute of Natural Resources Survey and Monitoring,Nanning,Guangxi 530200)
出处
《安徽农业科学》
CAS
2023年第13期55-59,共5页
Journal of Anhui Agricultural Sciences
基金
广西重点研发计划(桂科AB22080077)
广西科技基地和人才专项(桂科AD20238044)
广西空间信息与测绘重点实验室基金项目(191851011)。
关键词
植被覆盖
EVI指数
时空变化
地理探测器
广西
Vegetation coverage
Enhanced vegetation index
Spatial-temporal change
Geographic detector
Guangxi
