| 1982-1999年我国陆地植被活动对气候变化响应的季节差异 |
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| 引用本文： | 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. |
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| 作者姓名： | 朴世龙 方精云 |
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| 作者单位： | 北京大学城市与环境学系,北京大学生态学研究与教育中心,北京,100871 |
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| 基金项目： | 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)~~ |
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| 摘 要： | 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。
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| 关 键 词： | 1982－1999年 陆地 植被活动 NDVI 季节变化 气候变化 中国 二氧化碳 |
| 收稿时间： | 2002-04-17 |
| 修稿时间： | 2002年4月17日 |
Seasonal Changes in Vegetation Activity in Response to Climate Changes in China between 1982 and 1999 |
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| PIAO Shilong,FANG Jingyun.Seasonal Changes in Vegetation Activity in Response to Climate Changes in China between 1982 and 1999[J].Acta Geographica Sinica,2003,58(1):119-125. |
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| Authors: | PIAO Shilong FANG Jingyun |
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| Institution: | Department of Urban & Environmental Sciences, and Center for Ecological Research & Education, Peking University, Beijing 100871, China |
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| Abstract: | In the present study, using normalized difference vegetati on 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 1 982 to 1999. As a result, spatially averaged seasonal NDVI in China showed a pronounced increase in all four seasons (spring, summer, autumn and win ter) 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 int erannual changes in seasonal mean NDVI by vegetation type, it was fou nd 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 i n the eastern part of the country. |
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| Keywords: | climate change NDVI seasonal chang e vegetation activity |
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