关键词: 山地气候, 立体性, 分层模式

Abstract: By taking the mountainous region of North China as an examplein, this paper established a zones dividing model of agriculture-forest-animal husbandry. The steps are as follows:First, the calculating equations of annual mean temperature and annual rainfall amount were established. The calculation results indicate that when the height increases by 100 m, the temperature will decrease by 0.59℃~0.70℃ and the rainfall will increase by 20 mm~120 mm, respectively. Second, accordiny to above the caculation results, the vertical distribution of Natural Vegetation Net Primary Productivity (NPP) was calculated, the results indicate that the distribution of NPP with height presents a parabolic curve. The maxmum value of NPP i.e. NPP_(max) appeared at the middle-lower mountain slope and the height of NPP_(max) rises when drought increases. Third, on the basis of biology, the zones dividing indexes were determined by single factor (temperature) and synthetical factors including cumulative temperature (∑≥10℃), annual rainfall amount (R), frost-free season (N), drought index (K) and annual mean temperature (T). Finally, on the basis of above results, the zones dividing model was determined for mountionous regions of North China. In general, the model divides 3~4 zones:No.1~No.2 zones are agriculture-grain crops zones and No.3~No.4 are economic forests and commercial forests zone. The policy should be to sustain the development in the lower zones, to protect the upper zones, and to develop the middle zones.

Key words: mountainous climate, three dimensional characters zones, dividing model