南京幕府山构树群落种群动态的研究

RESEARCH ON DYNAMICS OF COMMUNITY AND POPULATION OF BROUSSNETIA PAPYRIFERA IN MUFU MOUNTAIN NANJING

通过南京幕府山地区构树群落种群的调查,对构树群落的组成、种群径级、垂直结构、密度等进行分析。总结了群落动态规律。对 模拟自然植被恢复,建设幕府山矿区废弃地生态恢复工程具有重要意义。

This research aims to provide a comprehensive theoretical and technological approach to modeling and simulating the restoration process of the natural vegetation in Mufu mountain area, in the north of Nanjing City, Jiangsu, by studying the population dynamics of the bio-community of Broussnetia papyrifera. As is known, Broussnetia papyrifera is an important initial tree species in the degenerated landmass in the north-subtropical zones of China. Based on a statistics on the tree population in the area, the present author has made clear the trees size structure, its spatial pattern, population density and the dynamics of the species. The actual results are : (1) There exist only 16 species in all in the surrounding 800 m2plot, where the major species are Broussonetia papyrifera, Robinia pseudoacacia and Celtis tetrandra. To be exact, 509 trees are found with most of them being young in the 2 400 m2 plot. Broussonetia papyrifera takes 80% in all in the community; (2) There are two dynamic types of constructive species and co-edificator in the vertical construction of community. Broussonetia papyrifera and Celtis tetrandra can be taken as the first developing species while the second is senescent species, Robinia pseudoacacia; (3) A large number of trees are small DBH, which indicates that the succession will get better in the community; (4) No distinctive features can be found in the composition and structure of the tree species between plot 1 (the unmined site, where the community succession develops successfully) and the plots (the mined site, where the community succession develops successfully) numbered 2 to 9. Thus, it can be concluded that the major problem to restore the area's vegetation is to protect the soil from being spoiled by the over-mining activities.