中国绿洲区划探讨

绿洲的形成与地貌、气候、水分、土壤等自然条件有关,特别是热量条件与人类活动直接影响着绿洲生产力的大小.在对绿洲范畴进行界定的基础上,以气候地带的差异性、地貌单元和内陆河流域的完整性为区划原则,以水热条件、地貌单元、河流属性等为指标,进行绿洲区划;将中国绿洲划分为3大区及14个二级区;阐明了在二级区采用"区、类结合" 的划分方法,以地貌形态成因类型为指标进行绿洲类型的划分,可不再进行三级以下的区划.

Study on Regionalization of Oases in China

Formation of an oasis is related to the natural factors,such as landforms and water and soil conditions,especially the productivity of oasis is directly affected by sunshine conditions and human activities.Based on considering the large area of arid regions and the regional difference of oasis features in China,in this paper the former scholars' achievements are analyzed,and the disputations about oasis regionalization are discussed.Moreover,the oases in China are regionalized by regarding the difference of climatic zones,integrality of morphological units,attribute of drainage basins,integrality of continental drainage basins,etc.as the regionalization principles and the water and sunshine conditions,morphological units,attributes of rivers,etc.as the regionalization indexes.An oasis regionalization system is developed,on which the oases in China are regionalized into 14 subregions in 3 regions.Four difficulties of regionalizing the oasis districts at third level based on the oasis subregions are discussed.It is considered that the scientific significance and the practicability of regionalizing the oasis districts at third level should be deliberated,and it is suggested to classify the oasis types by combining the oasis subregions with oasis types based on considering the formation causes of landforms.