Analysis of Spatiotemporal Changes of NDVI in the Vegetation Growing Season in Qinghai-Tibet Plateau Based on MODIS Data
杜宜臻 1崔岩 1倪杰1
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作者信息
1. 枣庄学院旅游与资源环境学院,山东枣庄 277160
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摘要
利用2001-2020 年分辨率1 km MODIS归一化植被指数(NDVI)产品探讨青藏高原生长季植被的时空变化特征及规律.研究发现青藏高原生长季植被NDVI在空间上具有异质性,其数值从东南向西北逐渐递减,多年均值为0.14;近20a来NDVI的稳定生长区和改善区面积达到94%,青藏高原整体呈现出变绿趋势;NDVI与海拔呈负相关关系,平均海拔每升高1 000 m,NDVI下降0.09.研究结果为保护青藏高原生态系统等方面提供一定的科学参考.
Abstract
Based on the MODIS normalized difference vegetation index(NDVI)data from 2001 to 2020,the spatial-temporal variation characteristics of vegetation and their relationship with the beginning of the growing season(SOS),the end of the growing season(EOS),and altitude.The results show that NDVI in the growing season of the QTP has obvious spatial hetero-geneity,and its value gradually decreases from southeast to northwest,with an annual mean of 0.14.In recent 20 years,the area of stable growth and improvement reached totaled 94%,which means the ecological environment of the QTP showed a green trend.What is more,there is a negative correlation between the NDVI and altitude,and NDVI decreases by 0.09 for ev-ery 1 km increase in average altitude.The results aim to provide scientific references for future research on the restoration of the ecological environment and sustainable development of the QTP.
关键词
青藏高原/归一化植被指数/变化规律/海拔
Key words
Qinghai Tibet Plateau/normalized difference vegetation index/variation characteristics/altitude
维普
万方数据