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The Population Structure and Distribution Pattern of Rare Plant Dipentodon Sinicus

LIN Chang-song et al(Department of biology and Geography Science,Liupanshui Teachers College of Guizhu Province,Liupanshui,Guizhou 553004)  
Dipentodon sinicus was one of the Chinese national second protective wild plants.To investigate and describe the structure,dynamics and distribution pattern of D.sinicus population.Ten plots were established in Yushe National Forest Park,Western China,and field data were obtained by tally with contiguous grid quadrate method.Based on the analysis of size structure,height structure,time-specific life table,survival curve and assembling intensity indexes,the population structure and distribution pattern of D.sinicus were discussed.The results showed that the population structure of D.sinicus in majority samples were declining due to lack of seedlings and springwoods,although the proportion of seedling and springwoods did not small in the mass.With the growing of the individuals,the mortality rate of the individuals was increasing.The distribution pattern of D.sinicus,generally speaking,was clump,but there are differences in terms of intensity among various developmental stages: the more of the size structure and height structure,the less intensity of clump.It was related to their biological and ecological characteristics. Based on the analysis,suggesting that forest gap makes for regeneration of the seedlings and springwoods,so as to the D.sinicus population keeps a steady expanding.
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