A STUDY ON THE STRUCTURE OF LAND TYPES AND COMPREHENSIVE PHYSICAL REGIONALIZATION IN THE WEIBEI DRY PLAIN, SHANXI PROVINCE
渭北旱原土地类型结构与综合自然区划

The Weibei Dry Plain, Located to the north of Weihe River, is an important region for developing agriculture in. Shaanxi Province. It is rich in temperature and land resources, but rather poor in water resources, and erosion of soil is serious. Taking landform, vegetation aad soil as chief criteria, 7 firstlevel land types and 33 second-level land types are identified in the Weibei dry plain. A hierarchical scheme for land classification in the region is introduced.By the structure of land types we mean spatial arranging structure, succession structure and quantitative structure . In the Weibei Dry Plain, spati al arranging structure of land types may be divided into five groups, step-like, symmetrical ladderlike, sequential-distributed, belt-like and vertical-layer . According to structures and physical features of land types, the Weibei Dry Plain may be divided into 7 natural areas.Discussions are made on the major features of each natural area, as well as the orientation of its economic use