Land is a resource on which human depends for existence and development, and its quality is decided by its resource structure. This paper takes the arid area in Ningxia and Gansu Pro-vinces as a case and approaches a subject from classification and function of land resource structure. It is pointed out in this paper that there are six basic types of land resource structure, and that different structure types have different functions.
China is an agricultural country with vast area and long history as well as complicated natural conditions and has various production types in agriculture. Classification of the agri-cultural types in China, therefore, shows great possibilities and necessities.
By analysing the formation and spatial processes of the form structure of the Hanjaing delta system, this paper reveals the self-regulating tendency of its natural stru-cture.
This paper is designed to discuss the periglacio-geomorphic distribution and evolution in the source region of Urumqi River on the Tianshan Mountain on the basis of repeated mea-surements and investigation in the field during the period of from 1985 to 1989. The major conclusions arse as follows.
Using a two-dimensional β-mesoscale model, the numerical experiment about the influ-ence of inhomogeneous surface on the boundary-layer climate in summer was carried out in order to explore the reduction of droughts over the inhomogeneous underlying surface, which is consisted as forest and arid/wet bare land in the semi-arid region of North China (around 39°N, 100°E).
