Increasing terrestrial vegetation activity in China, 1982-999
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- 作者：Jingyun Fang (1)
Shilong Piao (1)
Jinsheng He (1)
Wenhong Ma (1) - 关键词：China ; NDVI ; vegetation activity ; climate change ; agricultural production ; urbanization
- 刊名：Science China Life Sciences
- 出版年：2004
- 出版时间：May 2004
- 年：2004
- 卷：47
- 期：3
- 页码：229-240
- 全文大小：1840KB
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Shilong Piao (1)
Jinsheng He (1)
Wenhong Ma (1)
1. Department of Ecology, College of Environmental Sciences, and Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, 100871, Beijing, China
文摘
Variations in vegetation activity during the past 18 years in China were investigated using the normalized difference vegetation index (NDVI) derived from the 3rd generation time series dataset of NOAA-AVHRR from 1982 to 1999. In order to eliminate the effects of non-vegetation factors, we characterized areas with NDVI < 0.1 as “sparsely vegetated areas-and areas with NDVI ?.1 as “vegetated areas- The results showed that increasing NDVI trends were evident, to varying extents, in almost all regions in China in the 18 years, indicating that vegetation activity has been rising in recent years in these regions. Compared to the early 1980s, the vegetated area increased by 3.5% by the late 1990s, while the sparsely vegetated area declined by 18.1% in the same period. The national total mean annual NDVI increased by 7.4% during the study period. Extended growing seasons and increased plant growth rates accounted for the bulk of these increases, while increases in temperature and summer rainfall, and strengthening agricultural activity were also likely important factors. NDVI changes in China exhibited relatively large spatial heterogeneity; the eastern coastal regions experienced declining or indiscernibly rising trends, while agricultural regions and western China experienced marked increases. Such a pattern was due primarily to urbanization, agricultural activity, regional climate characteristics, and different vegetation responses to regional climate changes.