地理研究

地理研究 ›› 2004, Vol. 23 ›› Issue (6): 753-759.doi: 10.11821/yj2004060005

• 论文 • 上一篇    下一篇

黄河流域NDVI时空变化及其与降水/径流关系

李春晖, 杨志峰   

  1. 北京师范大学环境学院水沙科学教育部重点实验室,北京100875
  • 收稿日期:2004-04-02 修回日期:2004-08-10 出版日期:2004-12-15 发布日期:2004-12-15
  • 作者简介:李春晖(1976-),男,安徽阜阳人,博士后.主要从事水资源、水环境评价研究,已发表文章30余篇。 E-mail:chunhuili@263.net
  • 基金资助:

    国家重点基础研究发展规划项目(G1999043605)

Spatio-temporal changes of NDVI and their relations with precipitation and runoff in the Yellow River Basin

LI Chun-hui, YANG Zhi-feng   

  1. School of Environment, Beijing Normal University, Key Laboratory for Water and Sediment Sciences, Ministry of Education,Beijing 100875, China.
  • Received:2004-04-02 Revised:2004-08-10 Online:2004-12-15 Published:2004-12-15

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241 | 54

摘要：

NDVI是表征区域植被覆盖的重要指标。本文把黄河流域划分为 16个区域 ,利用Pathfinder (探路者 )的AVHRR NDVI资料 ,得到各区域 1982～ 1998年NDVI统计序列 ,详细分析了各区域NDVI时空变化特征。研究表明 ,17年来黄河流域各分区年平均NDVI都呈增加趋势 ,说明植被覆盖增加 ,生态环境好转 ,但是 8月份龙羊峡以上和兰河干流区间NDVI则有所下降 ,生态环境有局部恶化趋势。最后研究各区域NDVI与降水、径流和径流系数的年内、年际相关关系 ,结果表明 :从年内变化看 ,黄河流域各区域NDVI变化与降水、径流变化呈明显的正相关 ;从年际变化看 ,黄河流域各区域NDVI波动趋势与降水具有一定的相关性 ,但与径流、径流系数变化的关系相对复杂 ,不具有明显的相关性

关键词: NDVI, 植被覆盖, 降水, 径流, 黄河流域

Abstract:

NDVI is an important index denoting a region's vegetation cover. In this paper, the Yellow River Basin is divided into 16 sub-regions and their NDVI series of 1982-1998 are obtained from AVHRR-NDVI of Pathfinder. The spatio-temporal changes of NDVI in the Yellow River Basin are analyzed. The results show that:(1) In general, NDVI in all sub-regions reaches peak value in July or August within a year in the Yellow River Basin. In average in the 17 years, the NDVI values show the increasing trends in August and in annual average in other sub-regions except that they show the downward trends in the Sanhua and the above Longyang gorge sub-regions in August. These imply that the coverage percentage of the vegetation presents a rising trend and the ecological quality is being improved on the whole in the Yellow River Basin, but there is some deteriorating trend in some sub-regions in August. (2) With obvious differences in the 16 sub-regions, the higher annual values of NDVI occur in the Taohe, Yiluohe and Weihe sub-regions, while the lower in the indraft area and the Lanhe sub-regions. The spatial changes of NDVI are unanimous with precipitation in most part of the Yellow River Basin, and the average changing rates of NDVI in different sub-regions are different. Finally, the relations of NDVI between precipitation, runoff and runoff coefficient in every sub-region are researched. The results show that NDVI has some apparent positive correlations with precipitation and natural runoff within a year, and furthermore, NDVI has some time lags behind precipitation. From the perspective of inter-annual changes, NDVI has some positive correlations with precipitation, but has complex relations with natural runoff and runoff coefficient variability. There is no, if any, obscure correlations between them.

Key words: NDVI, vegetation cover, precipitation, runoff, the Yellow River Basin