摘要
本研究以四川省昭觉县为研究对象,选取2000年和2020年Landsat7高分辨率遥感影像数据,提取归一化植被指数(Normal Difference Vegetation Index,NDVI),并运用空间自相关等方法,对昭觉县植被覆盖度时空变化特征进行分析。结果表明:(1)2000-2020年,昭觉县植被覆盖度总体水平较高,且北部、东部、南部高于中部、西部地区。2000年和2020年全县NDVI均值分别为0.6414和0.6384;(2)2000-2020年,昭觉县植被覆盖度西南部、东北部和中部有明显退化趋势,西北部、南部和东部呈现改善趋势。2000-2020年,昭觉县植被覆盖度明显退化区、中度退化区、基本不变区、中度改善区、明显改善区分别占全县面积的6.66%、9.58%、68.44%、4.09%、11.23%;(3)2000-2020年,昭觉县植被覆盖度变化空间集聚现象明显,空间自相关性较强。
Taking Zhaojue County as the research object,Landsat remote sensing image data from 2000 and 2020 were selected to extract the Normalized Difference Vegetation Index(NDVI),and spatial autocorrelation and other methods were used to comprehensively analyze the spatiotemporal changes in vegetation coverage in Zhaojue County from 2000 to 2020.The results indicate that:(1)From 2000 to 2020,the overall level of vegetation coverage in Zhaojue County was relatively high,and the northern,eastern,and southern regions were higher than those in the central and western regions.The average NDVI values for the entire county in 2000 and 2020 were 0.6414 and 0.6384,respectively;(2)From 2000 to 2020,the vegetation coverage of Zhaojue County remained generally stable,with a significant improvement trend in the northwest,south,and east,but a significant degradation trend in the southwest,northeast,and central regions.From 2000 to 2020,the vegetation coverage of Zhaojue County significantly improved,moderately improved,basically unchanged,moderately degraded,and significantly degraded areas accounted for 11.23%,4.09%,68.44%,9.58%,and 6.66%of the total county area,respectively;(3)From 2000 to 2020,the overall pattern of vegetation cover change in Zhaojue County showed strong spatial autocorrelation,and the vegetation cover change showed a significant spatial agglomeration distribution trend.
作者
李昌贵
杨建勇
Li Changgui;Yang Jianyong(Sichuan Changjiang Afforestation Bureau Group Co.,Ltd,Yibin,China;Sichuan Forestry Survey and Design Institute Co.,Ltd,Chengdu,China)
出处
《科学技术创新》
2023年第17期13-17,共5页
Scientific and Technological Innovation
关键词
植被覆盖度
时空变化
特征分析
昭觉县
vegetation coverage
temporal and spatial changes
feature analysis
Zhaojue County
