基于NDVI的植被覆盖变化分析——以甘肃省甘南藏族自治州为例
Change Analysis of Vegetation Coverage Based on the NDVI used Gannan Tibetan Autonomous Prefecture as an Example
包琼 1颉继珍 1吴翠霞 1雷元奇1
作者信息
- 1. 甘肃省土地开发整理中心,甘肃兰州 730000
- 折叠
摘要
为明确区域内植被覆盖状态,揭示地表植被的变化趋势,进而为揭示区域环境变化奠定基础,本文利用像元二分法计算了甘肃省甘南藏族自治州2000-2022年植被覆盖度,分析了甘南州植被覆盖空间变化特征、时间变化特征.结果表明:1)低植被覆盖度主要分布在甘南州北部,高植被覆盖度主要分布在甘南州东南部和西南部;2)2000-2022年,植被高覆盖度区域面积减少了88 168.75 hm2;植被低覆盖区域面积增加了3 268.75 hm2;3)2000-2005年植被覆盖度呈上升趋势,植被覆盖度改善的面积大于退化面积;2005-2015年植被覆盖度呈下降趋势,植被覆盖度改善面积小于植被覆盖度退化面积;2015-2022年植被覆盖度呈上升趋势,植被覆盖度改善的面积大于退化面积;总体来看,2000-2022年间,甘南州植被覆盖度呈现"上升—下降—上升"的波动趋势,改善面积为716 237.50hm2,而退化面积为857 193.75 hm2,植被覆盖度总体下降.
Abstract
Clarifying the vegetation coverage status within a region can explain the trend of changes in landmark vegetation,laying a foundation for explaining regional environmental changes.This article uses the pixel dichotomy method to calculate the vegetation coverage in Gannan Tibetan Autonomous Prefecture from the year of 2000 to 2022,and analyzes the spatial and temporal changes features.The results show that:1)Low vegetation coverage is mainly distributed in the northern part of Gannan Prefecture,while high vegetation coverage is mainly distributed in the southeastern and southwestern parts of Gannan Tibetan Autonomous Prefecture;2)From 2000 to 2022,the area of high vegetation coverage decreased by 88 168.75 hm2,the area of low vegetation coverage increased by 3 268.75 hm2;3)The vegetation coverage increased from 2000 to 2005,and the area of vegetation coverage improvement was larger than the area of degradation.From 2005 to 2015,the degree of vegetation coverage showed a downward trend,and the area of vegetation coverage improvement was smaller than that of vegetation coverage degradation.From 2015 to 2022,the degree of vegetation coverage showed an upward trend,and the area of vegetation coverage improvement was larger than that of degradation.Overall,from 2000 to 2022,the vegetation corerage in cannan prefecfure shoured a fluctuating trend of"rising-falling-rising",the area of vegetation coverage improvement in Gannan Tibetan Autonomous Prefecture was 716 237.50 hm2,while the area of degradation was 857 193.75 hm2,and the degree of coverage showed a downward trend.
关键词
NDVI/像元二分法/植被覆盖度/生态环境质量/甘南州Key words
NDVI/pixel dichotomy/vegetation coverage/ecological environment quality/Gannan Tibetan Autonomous Prefecture引用本文复制引用
基金项目
甘肃省自然资源厅科技创新型项目(202243)
出版年
2024
NETL
NSTL
万方数据