珠江流域植被覆盖时空变化分析

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Abstract

NDVI is an important index denoting a region's vegetation cover.Based on RS&GIS technology,this paper analyses and illustrates spatio-temporal changes of NDVI in the Pearl River Basin,by using 8 km resolution Global Inventory Modeling and Mapping Studies(GIMMS) Normalized Difference Vegetation Index(NDVI) dataset,monthly from 1982～2003.The main conclusions are:(1) In general,NDVI values show the decreasing trend(no passing the confidence level of 95%) in the Pearl River Basin in recent 22 years(1982~2003).Suggesting terrestrial vegetation activity in the Pearl River Basin continues to degrade.(2) In spring,NDVI values show the increasing trend(no passing the confidence level of 95%),but in summer,autumn and winter NDVI values show the decreasing trend(no passing the confidence level of 95%).(3) In the middle and lower reaches of the Pearl River,NDVI values display the decreasing trend at different confidence level,especially in the Pearl River Delta region displaying the significant decreasing tendency(at the 99% confidence level).But in the upper reaches,such as Nanpanjiang River,Beipanjiang River,Youjiang River,Zuojiang River and Yujiang River watershed,NDVI values display the increasing tendency(but no passing the confidence level of 95%).These spatial differences of change tendency in the Pearl River Basin are influenced by rapid urbanization,agricultural activity and climate change(precipitation,temperature change et al.) together.

Key words： NDVI Vegetation cover GIS Spatio-temporal changes The Pearl River Basin

Received: 25 August 2006

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	Articles by authors
	WANG Zhao-li
	CHEN Xiao-hong

Cite this article:

WANG Zhao-li,CHEN Xiao-hong. Spatio-temporal changes of NDVI in the Pearl River Basin[J]. , 2006, 25(4): 303-307.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2006/V25/I4/303

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