Spatial-temporal variation of NDVI and its climatic response in Li River Basin based on GEE

Applied and Computational Engineering Pub Date : 2024-05-07 DOI:10.54254/2755-2721/59/20240777

Yang Yihui, Zhang Lin

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Abstract

Vegetation serves as a crucial indicator of ecological environment in different regions. Land cover vegetation is significantly impacted by climatic factors and human activities, and good coverage can enhance the quality of the local ecological environment. The Lijiang River Basin is a typical karst landscape with a delicate ecological environment. Describing changes in the characteristics of vegetation cover under different influencing factors carries significant significance for the restoration of vegetation in karst areas, taking the Li River Basin as an example. This study is based on the vegetation NDVI dataset MOD13Q1 of the Li River Basin from 2000 to 2020. Results showed that: over the past 21 years, the Normalized Difference Vegetation Index (NDVI) mean value in the Li River Basin was around 0.85. The Li River Basins inter-annual growth rate was 0.011/10yr; nevertheless, there are substantial discrepancies among regions. Vegetation was notably more impacted by temperature than precipitation in terms of land cover. NDVI exhibited a decline trend from the central area to the peripheral areas. Additionally, there was a lack of vegetation cover on the upper, western side of the middle reaches, and eastern side of downstream.

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基于 GEE 的漓江流域 NDVI 时空变化及其气候响应

植被是衡量不同地区生态环境的重要指标。地表植被受气候因素和人类活动的影响较大，良好的植被覆盖可以提高当地的生态环境质量。丽江流域是典型的喀斯特地貌，生态环境脆弱。以漓江流域为例，描述不同影响因素下植被覆盖特征的变化对喀斯特地区植被恢复具有重要意义。本研究基于 2000-2020 年漓江流域植被 NDVI 数据集 MOD13Q1。结果表明：在过去 21 年中，漓江流域归一化植被指数（NDVI）平均值约为 0.85。漓江流域的年际增长率为 0.011/10yr，但区域间差异较大。从土地植被来看，温度对植被的影响明显大于降水。从中心地区到周边地区，NDVI 呈下降趋势。此外，上游、中游西侧和下游东侧缺乏植被覆盖。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Applied and Computational Engineering

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