地理科学进展

地理科学进展 ›› 2006, Vol. 25 ›› Issue (6): 102-107.doi: 10.11820/dlkxjz.2006.06.012

• 土地利用与模型应用 • 上一篇    下一篇

陕北榆林地区土地覆被变化分析

李忠峰,蔡运龙   

  1. 北京大学资源环境与地理学系, 土地科学中心, 北京100871
  • 收稿日期:2005-08-01 修回日期:2006-09-01 出版日期:2006-11-25 发布日期:2006-11-25
  • 作者简介:李忠峰( 1975- )| 男, 北京大学城市与环境学院博士后, 主要从事3S 与区域发展研究.
  • 基金资助:

    国家自然科学基金项目( 40571002) ; 国家重点基础研究计划(2006CB400505).

Land Cover Change and its Causes in Yulin Distr ict

LI Zhongfeng|CAI Yunlong   

  1. Department of Resources, Environment and Geography, the Centre for Land Study|Peking University, Beijing 100871
  • Received:2005-08-01 Revised:2006-09-01 Online:2006-11-25 Published:2006-11-25

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被引次数

17 | 4

摘要：

基于1981~2001 年NOVAA/AVHRR 和1998~2004 年SPOT VEGETATION 归一化植被 指数(NDVI) 数据， 对榆林地区植被动态变化进了定量研究， 并且利用多年气象数据分析了降水 和温度变化情况。结果表明: 榆林地区植被有了明显改善， 其改善状况集中于8、9、10 月份; 植被 覆被变化具有明显的区域差异， 北部植被覆盖改善的趋势明显， 且变化比较平稳; 南部增加趋势 不明显， 有的地方还呈下降趋势， 变化幅度大。

关键词: 归一化植被指数, 区域差异, 土地覆被, 榆林地区

Abstract:

Yulin district is located in the most Northern part of Shaanxi province, between 36°57′and 39°34′N, and 107°28′and 111°15′E. Yulin district is one of the areas of the most serious soil erosion in the world and receives a lot of attention from the Chinese government and international societies. After the establishment of the People's Republic of China, the desertification intensity declined because of rehabilitation measures. However, there is lack of knowledge concerning the dynamics of land cover and the complex role of factors in inducing changes in land cover. In the study, by usage of normalized difference vegetation index(NDVI) as an indicator of vegetation activity, seasonal trends of vegetation activity and their dynamic responses to climate changes in Yulin district were explored based on remotely sensed data (NOAA- AVHRR and VEGETATION) from 1981 to 2004. As a result, spatially averaged seasonal NDVI in Yulin showed a pronounced increase during the last two decades. The average autumn NDVI indicated the most significant increase. By analyzing inter- annual changes in seasonal NDVI, 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. From the southeast to the northwest, change amplitude showed a declining trend.

Key words: land cover, NDVI, regional heterogeneity, Yulin district

中图分类号: 

  • F301.24