Abstract:

Based on the theory of ecological field, a natural community of Castanopsis fabri in Jinggang Mountain Natural Reserve of Jiangxi Province is selected to study and the result in this paper shows that ecological quantity field of C. fabri population has many features as follows: 1) Domain of the ecological quantity of C. fabri population is a circular of 60 m radius; 2)The “hump value" of β runs 100 years; 3) The gradient of the ecological quantity field of C. fabri population is as follows: Potential of quantity field gets stronger within 0～14.4 m of standardized distance and then it becomes weaker within 18.8～28.8 m in standardized distance; 4) The ecological quantity field of C. fabri population has the following features: First, it is one of cyclical and damp oscillation with a cycle of 50 years; Secondary, its amplitude sustains with a higher level of 250 years which indicate that up till now, the community of C. fabri is not on the decline;Third, the community of C. fabri will being on decline after 325 years when the dominant species of C. fabri will be replaced by other species in this community.

Key words: community of Castanopsis fabri, dominant population, ecological quantity field, Jinggang Mountain