文献类型： 外文期刊

作者： Sun, DF ¹ ; Dawson, R ² ; Li, H ² ; Li, BG ² ;

作者机构： 1.China Agr Univ, Coll Nat Resources & Environm Sci, Minist Educ, Lab Plant Soil Interact Proc, Beijing, Peoples R China

2.China Agr Univ, Coll Nat Resources & Environm Sci, Minist Educ, Lab Plant Soil Interact Proc, Beijing, Peoples R China; China Agr Univ, Coll Nat Resources & Environm Sci, Beijing, Peoples R China; Beijing Acad Agr & Forestry, Beijing, Peoples R China

关键词： China; desertification monitoring; landscape pattern analysis; muti-temporal remote sensing; oasis

期刊名称：ENVIRONMENTAL MONITORING AND ASSESSMENT （ 影响因子：2.513； 五年影响因子：2.871 ）

ISSN： 0167-6369

年卷期： 2005 年 108 卷 1-3 期

页码：

收录情况： SCI

摘要： Monitoring environmental processes is becoming increasingly important wherever there is increasing population and economic development pressure placed on fragile environments. Remote sensing, digital image processing, and spatial analysis have proven to be useful technologies in both assessing and monitoring environmental change. In this study, they were used to assess desertification processes and change in Minqin County, China from 1988 to 1997. The results suggest that wind erosion was the dominant cause of desertification in more than half of the study area. Coupled with this were increases in salinization processes, affecting 33.62% of the land area in 1997. Overall, moderate desertification was found to be the dominant desertification grade (43.64% of total area), followed by extreme/severe desertification (26.15% of total area) in 1997. In addition, examination of landscape pattern changes indicated that desertification processes at the landscape level were becoming evident at increasing levels of fragmentation, complexity in shape, and isolation of patches. Major fluctuations in desertification type and grade were found at the fringes of oases, where an ongoing shift was taking place between cultivation, abandonment, and reclamation.