The role of seasonal river in the evolution of desertification in semi arid region: taking Tabu river basin of Inner Mongolia as an example
Received date: 2003-11-15
Revised date: 2004-04-14
Online published: 2004-08-15
Desertification issue of farming pastoral interlaced area has been paid attention to by the whole society In different areas, the developing mode and process of desertification are quite different It is characterized by distinct regionality and differences in the cause of desertification. A noticeable scientific subject is the role of seasonal rivers in the evolution of desertified landforms in semi arid region Siziwang county located in the central part of Inner Mongolia and to the northwest of Ulanqab League lies between 110°20′～113°00′E and 41°10′～43°22′N It covers an area of 24016 km 2 , and topographically,it is higher in the southern part than in the northern Tabu river has many seasonal branches It is the longest river in Siziwang county In Tabu river basin, there are abundant outcrops of Tertiary and Quaternary fluvial lacustrine facies, and there are many sandbelts and ridges along the branch rivers At present, the most serious desertification process is in Ulanqab League of Inner Mongolia Taking Tabu river basin of Siziwang county as an example, and based on RS image processing and analyzing, the paper researches the role of seasonal rivers in the evolution of desertification in semi arid area, and analyzes idiographic mechanism and pattern of desertification development under combined action of wind water integration In arid and semi arid areas, especially when anthropogenic activities are involved, surface vegetation is sparse, and even barren ground is seen. Under the effect of rainstorms in summer, a great deal of mud and debris materials are transported by torrents, and these materials accumulated in the broad valleys of the middle and lower reaches of the rivers With the silting up of mud and sand, and the broadening of the river courses, driftsand is spreading to both banks In spring, with the co operation function of "the narrow tube effect of wind" and the partial circulation of air current, the sand spreads further around, and connects with the alluvial fans, resulting in the formation and development of large scale desertification. It eventually may lead to desertification in the whole area
Key words： semi arid area; seasonal river; desertification; Tabu river basin
WANG Xin yuan, CHANG Yue ming, GAO Chao, LU Ying cheng, SHA Jun ying . The role of seasonal river in the evolution of desertification in semi arid region: taking Tabu river basin of Inner Mongolia as an example[J]. GEOGRAPHICAL RESEARCH, 2004 , 23(4) : 440 -446 . DOI: 10.11821/yj2004040003
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