近20年来黄河流域植被覆盖变化分析
收稿日期: 2002-04-15
修回日期: 2002-10-08
网络出版日期: 2002-11-25
基金资助
国家重点基础研究规划项目(G1999043601)
The Vegetation Cover over Last 20 Years in Yellow River Basin
Received date: 2002-04-15
Revised date: 2002-10-08
Online published: 2002-11-25
Supported by
National Key Program for Basic Research, No.G1999043601
杨胜天,刘昌明,孙睿 . 近20年来黄河流域植被覆盖变化分析[J]. 地理学报, 2002 , 57(6) : 679 -684 . DOI: 10.11821/xb200206007
Vegetation cover is a major feature for ecological system. The change of vegetation cover in large area is mainly caused by climate and human activities. The Yellow River, the second largest river in China with a basin of 752,443 km2, includes semi-arid and arid environment. Therefore, it is necessary to study the change of vegetation cover in the Yellow River Basin, which will help us understand climate influences and impacts of human activities. In order to understand the change of vegetation cover in the Yellow River Basin and its influencing factors, we use the data of AVHRR-NDVI and the information of 76 meteorological stations in the Yellow River Basin covering 1982-1999 to analyze their spatial distribution and dynamic change in spring, summer and autumn. On the basis of calculating the NDVI mean deviation and Moisture Index (MI) mean deviation, we study the feature of MI mean deviation, the speed of NDVI mean deviation and the correlation between them. Finally, some conclusions are drawn. Firstly, the climate was relatively humid from 1982 to 1992 and relatively dry since 1993. The environment in the Yellow River Basin tended to be desiccated, but the vegetation cover is increasing. Secondly, the correlation between NDVI mean deviation and MI mean deviation demonstrates that the humid climate was helpful for vegetation cover. Thirdly, the average speed of vegetation cover increase was 0.58%. The speed of vegetation cover increase in the loess region and catchment area is 0-3.8%, which shows the achievement of ecological measurements in China. The vegetation cover in desert and riverhead region is decreasing, the speed of which is 0-3.0%, a reflection of the climate change.
Key words: the Yellow River; vegetation cover; Moisture Index; remote sensing
[1] Deferis R S, Townshend J R G. NDVI-derived land cover classification at a global scale. International Journal of Remote Sensing, 1994, 15: 3567-3586.
[2] Tucher C J, Townshend J R G, Goff T E. African land-cover classification using satellite data. Science, 1985, 227: 369-375.
[3] Sun Hongyu, Wang Changyao, Niu Zheng et al. Analysis of the vegetation cover change and the relationship between NDVI and environmental factors by NOAA times series data. Journal of Remote Sensing, 1998, 2(3): 204-210.
[孙红雨, 王长耀, 牛铮 等. 中国地表植被覆盖变化及其与气候因子关系. 遥感学报, 1998, 2(3): 204-210.]
[4] Li Xiaobing, Wang Ying, Li Kerang. NDVI sensitivity to seasonal and interannual rainfall variations in northern China. Acta Geographica Sinica, 2000, 55(suppl.): 85-89.
[李晓兵, 王瑛, 李克让. NDVI对降水季节性和年际变化的敏感性. 地理学报, 2000, 55(增刊): 85-89.]
[5] Sun Rui, Liu Changming, Zhu Qijiang. Relationship between the fractional vegetation cover change and rainfall in the Yellow River Basin. Acta Geographica Sinica, 2001, 56(6): 667-672.
[孙睿, 刘昌明, 朱启疆. 黄河流域植被覆盖动态变化与降水的关系. 地理学报, 2001, 56(6): 667-672.]
[6] Piao Shilong, Fang Jingyun. Dynamic vegetation cover change over the last 18 years in China. Quaternary Sciences, 2001,21(4): 294-302.
[朴世龙, 方精云. 最近18年来中国植被覆盖的动态变化. 第四纪研究, 2001, 21(4): 294-302.]
/
〈 |
|
〉 |