关键词: 人工林群落, 结构, 稳定性

Abstract: Forest community stability is one kind of harmony between organism itself and its living environment. Having studied on the present situation of artificial forest species and their structure, and the natural vegetation status in the northern and southern mountains of Lanzhou city we proposed the overall thought train about the artificial forest arrangement and the existing forest optimization, based on the approximately natural forestry theory and from the angle of community stability. The stability of artificial forest community in the northern and southern mountains of Lanzhou city should be based on the mutual adaptation between the environment and the planted tree species. In the regions with good irrigation conditions, the most suitable community structure is arbor+bush+grass compound, such as in Lanzhou suburb and in the green passage from Lanzhou to Zhongchuan Airport; in the regions with better local conditions for example mesa and table land, the suitable is single-layer arbor forest with the economic forest as the main; in regions with worse or no irrigation conditions, the suitable is bush and grass double-layer structure. The effective measures for setting up approximately natural communities and sustain their stability are adopting scientific and reasonable controlling technology and fully making use of natural precipitation.

Key words: artificial forest community, structure, stability