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植被的时空变化及其与孟加拉国不同水气候因素的关系

Swadhin Das¹, Showmitra Kumar Sarkar¹

¹Department of Urban and Regional Planning, Khulna University of Engineering & Technology (KUET), Khulna, 9203, Bangladesh.

|August 3, 2023

概括

孟加拉国植被变化与气候变化有关. 增强植被指数 (EVI) 更好地反映了这些变化及其与气候因素 (如蒸发转化) 的联系,而不是规范差异植被指数 (NDVI).

科学领域:

环境科学环境科学
遥感遥感遥感遥感
气候变化研究气候变化研究

背景情况:

孟加拉国因气候变化而面临生态多样性挑战.
了解植被动态对于环境管理至关重要.

研究的目的:

调查孟加拉国的时空植被变化.
分析植被指数与水气候因素之间的关系.

主要方法:

使用了MODIS卫星图像和谷歌地球引擎 (GEE).
从2001年至2020年分析了规范差异植被指数 (NDVI),增强植被指数 (EVI),降水量 (PPT),蒸发透气量 (ET) 和陆地表面温度 (LST).
应用曼-肯达尔趋势测试和相关性分析.

主要成果:

NDVI和EVI都显示出明显的趋势,其中Sen的斜率值为正值.
与NDVI (r2=0.17) 相比,EVI与水气候因素,特别是ET (r2=0.37) 的相关性更强.
蒸发透气解释了17%的NDVI波动;在NDVI和降水之间没有发现相关性.

结论:

在检测与水气候因素相关的植被变化方面,EVI比NDVI更有效.
该研究强调了孟加拉国EVI和气候变量之间的显著关系.

关键词:

孟加拉国孟加拉国孟加拉国这就是EVI EVI EVI.地理信息系统 (GIS) 是一个谷歌的地球引擎.NDVI NDVI 在线阅读植物动态植物动态

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