基于Landsat的兴安县植被覆盖度时空变化研究

Spatial-temporal Change of Vegetation Coverage in Xing'an County Based on Landsat

本研究使用兴安县Landsat影像,采用像元二分模型估算植被覆盖度(FVC),并使用一元线性回归法分析植被覆盖度变化趋势。结果表明:(1)研究区平均FVC在2013-2021年间呈“S”型的上升趋势,在2016年达到最大(0.754),在2019年最小(0.635),平均FVC为0.707;(2)年平均FVC空间分布呈现南北高、中间低的分布情况,其中高等级FVC占比最多,低等级FVC占比最少;(3)研究区多年植被覆盖变化趋势向好。

Landsat images of Xing 'an County were used in this study.The binary pixel model was used to estimate the vegetation coverage(FVC),and the single linear regression method was used to analyze the change trend of vegetation coverage.The results showed as follows:(1) The average FVC area showed an "S"-shaped upward trend from 2013 to 2021,reaching the maximum(0.754) in 2016 and the minimum(0.635) in 2019,with an average FVC of 0.707;(2) The spatial distribution of annual average FVC was high in the north and south,and low in the middle,in which high-grade FVC accounted for the most and low-grade FVC accounted for the least;(3) The change trend of vegetation cover in the study area has been good for many years.