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中国沙漠 ›› 2006, Vol. 26 ›› Issue (5): 687-692.

• 沙漠与沙漠化 • 上一篇    下一篇

现代草地沙漠化中自然因素贡献率的确定方法

李振山1, 贺丽敏1, 王 涛2   

  1. 1.北京大学 环境工程系, 水沙科学教育部重点实验室, 北京 100871; 2.中国科学院 寒区旱区环境工程研究所 沙漠与沙漠化重点实验室, 甘肃 兰州 730000
  • 收稿日期:2004-12-16 修回日期:2005-01-21 出版日期:2006-09-20 发布日期:2006-09-20

A Method for Determining the Contribution of Natural Factors on Sandy Pasture Desertification

LI Zhen-shan1, HE Li-min1, WANG Tao2   

  1. 1.Department of Environmental Engineering, Peking University, Beijing 100871, China; The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China; 2.Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
  • Received:2004-12-16 Revised:2005-01-21 Online:2006-09-20 Published:2006-09-20

摘要: 基于草地沙漠化发展过程中流沙面积变化模型和植被盖度变化模型,结合沙漠化监测资料,提出了一种定量确定自然因素在沙漠化中贡献率的方法,从而也可以间接地推算人为因素在沙漠化中的贡献率。以内蒙古奈曼旗现代草地沙漠化为例对模型进行了应用,效果良好,并发现人类活动停止后,如果随后不出现持续的干旱年份,沙漠化所造成的流沙一般经过4~5 a的时间就会自然消失,说明在计算时段内草地沙漠化中自然因素的贡献率为零。

关键词: 草地沙漠化, 自然因素, 贡献率, 流沙盖度, 植被盖度, 模型

Abstract: Based on models for drifting sand cover and vegetation cover and dynamical monitors of desertification, an analytical method was proposed for determining the quantity effect of natural factors on sandy pasture desertification. Models for drifting sand cover include the sand transport rate model, threshold wind model and erosion rate model. The model of vegetation cover is featured by consideration of effect of the drifting sand on utilization of precipitation. The application of the method in the pasture desertification in Neman Banner, Inner Mongolia shows good results. It take about 4 or 5 years for the desertified pasture rehabilitating after the human activities stop, if not drought years occur in succession. Natural factors had no contribution to the pasture desertification in Neiman Banner in recent years.

Key words: sand pasture desertification, contribution ratio, natural factor, drifting sand cover, vegetation cover, model

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