摘要
以美国国家航天局(NASA)提供的MODIS卫星影像数据计算所得的植被归一化指数(NDVI)数据为基础,研究三峡库区2000-2019年间植被覆盖的时空变化.采用最小二乘法分析三峡库区20年来植被覆盖变化的趋势,研究三峡库区NDVI变化的持续性特征.结果表明:(1)三峡库区植被在空间分布上具有明显的差异,其中库区东部植被覆盖优于库区的西部;(2)20年来三峡库区的植被覆盖均值为0.54,植被覆盖度较好,但存在年际波动;(3)三峡库区存在明显的生长季节,时间为4-9月;(4)植被呈上升趋势的区域占总面积的95.44%,仅4.56%的地区植被负增长.对三峡库区NDVI空间格局变化的分析可为其生态保护提供理论和数据支撑.
The spatial and temporal changes of vegetation cover in the Three Gorges reservoir area from 2000 to 2019 was inves⁃tigated based on the normalized difference index of vegetation(NDVI)calculated from the MODIS satellite image data provided by NASA.The trend of vegetation cover change in the Three Gorges reservoir area over the past 20 years was analyzed by the least squares method,and the persistence characteristics of NDVI changes in the Three Gorges reservoir area were studied.The study shows that:(1)the spatial distribution of vegetation in the Three Gorges reservoir area has obvious differences,with vegeta⁃tion cover in the eastern part of the reservoir area being better than that in the western part of the reservoir area;(2)the mean val⁃ue of vegetation cover in the Three Gorges reservoir area over the past 20 years is 0.54,with better vegetation cover,but there are inter⁃annual fluctuations;(3)there is a distinct growing season in the Three Gorges reservoir area,which lasts from April to September;(4)vegetation increases in 95.6%of the total area,and only 4.56%of the area has negative vegetation growth.The spa⁃tial pattern change of NDVI has general theoretical and practical significance for the Three Gorges reservoir area.
作者
叶润根
陈国建
王震
何谦
张春叶
YE Rungen;CHEN Guojian;WANG Zhen;HE Qian;ZHANG Chunye(School of Geography and Tourism,Chongqing Normal University,Chongqing 401331,China)
出处
《宜宾学院学报》
2021年第6期81-84,98,共5页
Journal of Yibin University
基金
国家自然科学基金项目“紫色土坡耕地土石复合坎结构与水土保持效应研究”(41471234)。
关键词
三峡库区
NDVI
时空变化
Three Gorges reservoir area
NDVI
temporal and spatial variation
