1982-1999年我国陆地植被活动对气候变化响应的季节差异
收稿日期: 2002-04-17
修回日期: 2002-10-09
网络出版日期: 2003-01-25
基金资助
国家重点基础研究发展规划项目 (G2000046801); 国家自然科学基金项目 (40152003)
Seasonal Changes in Vegetation Activity in Response to Climate Changes in China between 1982 and 1999
Received date: 2002-04-17
Revised date: 2002-10-09
Online published: 2003-01-25
Supported by
National Key Project for Basic Research, No.G2000046801; National Natural Science Foundation of China, No.40152003
利用NOAA-AVHRR数据，以归一化植被指数 (NDVI) 作为植被活动的指标，研究中国1982~1999 年四季植被活动的变化，探讨植被活动对全球变化的主要响应方式。结果表明，18年来，中国植被四季平均NDVI均呈上升趋势。春季是中国植被平均NDVI上升趋势最为显著 (P<0.001)、增加速率最快的季节，每年平均增加1.3%；而秋季是NDVI上升趋势最不显著的季节 (P=0.075)。不同植被类型的季节平均NDVI的年变化分析表明，生长季的提前是中国植被对全球变化响应的最主要方式，但这种季节响应方式存在明显的区域性差异。夏季平均NDVI增加速率达到最大的地区主要分布在西北干旱区域和青藏高寒区域，而东部季风区域的植被主要表现为春季NDVI增加速率最大。
关键词： NDVI；季节变化；气候变化；植被活动
朴世龙,方精云 . 1982-1999年我国陆地植被活动对气候变化响应的季节差异[J]. 地理学报, 2003 , 58(1) : 119 -125 . DOI: 10.11821/xb200301014
In the present study, using normalized difference vegetation index (NDVI) as an indicator of vegetation activity, seasonal trends of vegetation activity and their dynamic responses to climate changes in China were explored based on remotely sensed data (NOAA-AVHRR) from 1982 to 1999. As a result, spatially averaged seasonal NDVI in China showed a pronounced increase in all four seasons (spring, summer, autumn and winter) during the past 18 years. The average spring NDVI indicated the most significant increase (P<0.001) with a mean rate of 1.3%, while the average autumn NDVI showed the least increase (P=0.075). Analyzing interannual changes in seasonal mean NDVI by vegetation type, it was found that the advance of growing season was a major way for response of vegetation activity to climate changes and that the way exhibited a large regional heterogeneity. In the past 18 years, regions with the largest increase rate of summer NDVI appeared in Northwest China and the Tibetan Plateau, while areas with that of spring NDVI occurred in the eastern part of the country.
Key words： climate change; NDVI; seasonal change; vegetation activity
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