Research On The Spatial Pattern And Dynamic Of Liquidambar Formosana Hance. On Yuelu Mountain

Liquidambar formosana Hance. is a tall deciduous tree species, belonging to the family Hamamelidaceae, he generus Liquidambar L.. It is always distributed those places below 1000 to 1500m,on plains, in hilly valleys and foothills. They are beautiful garden trees and famous Autumn landscape trees in Southern China, playing an important role in mixed forest. To explore the distribution patterns of the population in Yuelu Mountain, 56 plots were set up according to slopes and aspects. On the basis of field observations, the tempo-spatial patterns and dynamics of the population are analyzed. The results show that:In different habitats, the distribution pattern of Liquidambar formosana Hance population is different. Liquidambar formosana Hance in the upper-slope,middle-slop,under-slope all present clump distribution with gradually reducing aggregation. It is clump distribution in the sunny, semi-sunny and semi-cloudy slope but random distribution in the cloudy slope. Liquidambar formosana Hance at the seedlings, saplings, and middle-aged stands all presents clump distribution, clump degree of its seedlings is the highest, middle-aged trees are the second, saplings is the lowest; trees at the old-aged stage are randomly distributed.With respect to the Liquidambar formosana populations,they have lower fractal dimension and low capability about occupying the ecological space, and with the changes of scale, pattern intensities little change, then individual spatial conjunction is not strong. Ecological gap of Liquidambar formosana Hance is larger, in turn, the potential ecological space capacity for extension is strong. However, because of the constraints of eco-environmental factors, the accomplishment of the potential ecological space capacity become difficult. In comparison, the fractal dimension of Liquidambar formosana in the downhill, sunny slope is higher, but lower on upper and cloudy slope. Due to Liquidambar formosana Hance's biological characteristics and the impact of habitats on it, the seedlings occupy less ecological space, the small-scale patterns change little , the degree of competition among individuals is not strong. With respect to sapling stage, the ecological occupying space capabilities is stronger than the seedlings, but still lower. The fractal dimension of middle-aged tree is relatively large; at old-aged stage, fractal dimensions decrease.Overall, by the strongly environmental sieve, the growth process from seedlings to saplings, more seedlings died, saplings lack and the middle-aged trees are clumpy. The lack of the seedlings in place on the renewal and cloudy slope influences population updates on these places. Although the dynamics index of the population on Yuelu Mountain exceed 0, but it have a smaller index, the growth of the population is little interference, by the non-random, population of Liquidambar formosana Hance on the cloudy slope will deteriorate.