2002-2021年雅砻江锦屏一级水电站库区NDVI时空变化及其与气候因子的相关性
Spatial-temporal changes of NDVI and their relationships with climate factors in the reservoir area of Jinping hydropower station(grade 1)on the Yalong River from 2002 to 2021
刘丽 1姬星 2胡祥 2徐丹 1童芳 2张洪茂3
作者信息
- 1. 雅砻江流域水电开发有限公司,四川 成都 610000
- 2. 武汉市伊美净科技发展有限公司,湖北 武汉 430070
- 3. 华中师范大学 生命科学学院,湖北 武汉 430079
- 折叠
摘要
利用长时间序列的MODIS遥感影像和气象数据,应用归一化植被覆盖度指数(NDVI)、趋势分析、Mann-Kendall统计检验法、相关分析等方法,分析了 2002-2021 年雅砻江锦屏一级水电站库区植被覆盖的时空分布和变化趋势,对植被覆盖度的变化突变点进行识别,探讨了区域植被覆盖度与气候的关系,解释了可能导致植被覆盖度变化的原因.结果表明:1)近 20 年来,锦屏一级水电站库区NDVI总体呈增长趋势,海拔 3 000～3 500 m是区域内NDVI最高的区间,NDVI呈现减少主要为近库区沿岸海拔 2 500m以下区域,呈现增加的主要集中在库区西南部、西北部及东北部海拔 2 500～3 500 m区域;2)锦屏一级水电站库区蓄水前 10 年植被覆盖度增加速度低于蓄水后 10 年的植被覆盖度增加速度,并在蓄水完成的 2014 年出现了转折点;3)锦屏一级水电站库区植被覆盖度的变化与湿度、降水相关,区域内生态保护与恢复工程和库区防护林营造工程的实施也起到了一定成效.
Abstract
Based on long time series MODIS remote sensing images and meteorological data,we analyzed the spatiotemporal distribution and changes of vegetation coverage and the relationship with climate factor in the reservoir area of Jinping hydropower station(grade 1)from 2002 to 2021.The results showed that:1)In the past 20 years,the vegetation coverage of Jinping hydropower station(grade 1)has shown an increasing trend,in which,the highest vegetation coverage distributed between 3 000～3 500 m of elevation;The decrease of NDVI was mainly in the coastal area below 2 500 m,and the increase was mainly concentrated in the southwest,northwest and northeast of the reservoir area between 2 500～3 500 m of elevation;2)The growth rate of vegetation coverage in the first 10 years before the water storage in Jinping hydropower station(grade 1)was lower than that in the 10 years after the water storage,and change-point occurred in 2014 when water retain in Jinping grade 1 was completed;3)The changes in vegetation coverage in the Jinping hydropower station(grade 1)hydropower station reservoir were associated with annual humidity and annual precipitation,and benefited from the implementation of ecological protection and restoration projects and the construction of protective forests in the reservoir area.
关键词
NDVI/时空变化/锦屏一级水电站库区/水库蓄水/气候因子Key words
NDVI/spatiotemporal variation/Jinping hydropower station(grade 1)/reservoir impound/climate factors引用本文复制引用
出版年
2024
NETL
NSTL
万方数据