摘要
浑善达克沙地地处环境脆弱的东亚夏季风北缘,沙漠化进程备受关注。综述了关于浑善达克沙地近30年来沙漠化的研究进展,并从沙漠化过程、成因和发展趋势等方面讨论了研究中存在的问题。认为沙漠化过程研究难以深入,主要原因是在沙漠化速度和程度方面存在分歧,对沙漠化概念理解、研究材料及评价指标选择上存在差异。浑善达克沙地沙漠化是自然和人为因素共同作用的结果,沙漠化过程研究结果的分歧导致了成因的多解性,其中自然和人为因素的耦合与反馈过程、生态系统阈值、极端事件的影响是成因分析中需要解决的问题。全球变暖将导致浑善达克沙地沙漠化在21世纪进一步发展。
Located in the northern margin of East Asian summer monsoon,Hunshandake Sandy Land is well-known for its ecologically vulnerable characteristics,and its desertification processes are concerned by both public and scientific communities.In this paper,we reviewed studies of the desertification in Hunshandake Sandy Land during the last 30 years.The current inconsistencies of understanding the desertification in this region were discussed in detail,regarding processes,causes and future trends.It shows that investigations on desertification processes are not thorough yet although a large number of publications are available.Different perspectives on the concept of desertification and differences in the selections of research materials and assessment indexes cause the discrepancies about the view on desertification degree and rate in Hunshandake Sandy Land.Combination of high resolution remote sensing and comprehensive field investigations is needed to unveil the complex ecological processes of sandy land.The system for monitoring desertification processes should be developed from these studies.Desertification in the Hunshandake Sandy Land is originated from interactions between human activity and climate changes,and uncertainties in desertification processes studies lead to the confusion about the causes of desertification.To distinguish between climate and human-induced desertification,a clear understanding of desertification processes,especially further investigations on feedback,coupling effects and threshold of sandy land system and effects of extreme events on desertification,are required.Desertification is likely to proceed in Hunshandake Sandy Land as a consequence of global warming.And improving the spatio-temporal accuracy of assessing dune activity in the future is not only a significant but also a challenging work for scientists to accomplish.
出处
《地球科学进展》
CAS
CSCD
北大核心
2010年第6期647-655,共9页
Advances in Earth Science
基金
中国科学院知识创新工程重要方向项目“沙漠高大沙丘的形成、发育与全球变化”(编号:KZCX2-YW-119)
国家自然科学基金重点项目“浑善达克沙地的形成、末次间冰期以来的演变过程及其对全球变化的响应”(编号:40930105)资助
关键词
沙漠化
遥感
浑善达克沙地
Desertification
Remote sensing
Hunshandake Sandy Land.
