| Disan thus cercidifolius Maxim. var. longipes H. T. Chang belongs to Ham amelidaceae and Hamamelis L. and it the single species and genus of pteridophyte. It's listed into the national sencondrate protected species, which is in imminent danger. This plant scatters in some counties of Hunan province, Jiangxi province and Zhejiang province. And Jianggang Mountain is the newly found distribution area. Its distribution area is very limited, where one can find few and in some places, this species has died out. The study of it has a certain scientific significance in geographical feature of East Asia where Disan thus cercidifolius Max in. var. long!pes H. T. Chang grows. In this paper, the community, the species diversity and the character of liaison between species are studied and the rudemental research on twenty kinds of pattern character and nine kinds of isotropic enzyme system of 53 individuls in 5 communities under different living conditions of Disan thus cercidifolius Max in. var. ]ongipes H. T. Chang in new distribution areas from the two aspects of patterns and isotropic enzyme, combining with many kinds of quantity statistics analytic methods and using many kinds of software to have a comprehensive analyze. The results show that: Disan thus cercidifolius Maxim. var. ]ongipes H. T. Chang exists in Caijiatian, Dongshang town of Jiangang Mountain. It is a new distribution area and its elevation is from 63Cm to 1 05Cm. There are 80 species of advance plants in the community of Disan thus cercidifolius Max in. var. ]ongipes H. T. Chang, which include mutations. Each of them belongs to 51 family and 64genus, in which the pteridophyte is 7family, 7genus and 9species and it accounts for 2.96% of the whole species of Jinggang Mountain pteridophyte, 6.93%of the whole geneses and 15.91% of the whole families. There are 44family, S5genus and 7lspecies of seed plant, which accounts for 7.87% of the total geneses of Jinggang Mountain. The tropical genus has taken a dominant position among the distribution area types of the geneses of the community. There are 28 Mid-tropical geneses, which accounts for 4.90% of the total geneses. Moreover, the majority of them are the geneses of Pan-tropical and Asian Patterns. Temperate geneses account for 43.14% with the number of 22, and Chinese special genus, 1.96%, with the number of 1. The species diversity in the community has the rising trend with the decrease of the height above elevation. But the linear relationship has not been shown. The level of the species diversity of the community with the majority of Mao-bamboo is the lowest. In the community, the total related difference VR is 1.1261 and test statistics W is 28.1526, which shows a certain direct relation and reflects that the community is in a fairy stable period. 40 species couples among 78 species couples of 13 species have revealed the direct relationship, 37 inverse relationship and 1, relatively independent relationship. Among which 4 species couples have revealed the obviously inverse relationship and one has inverse the obviously relationship between Disan thus cercidifolius Maxim. var. ]ongipes H. T. Chang and each of the other 12 species. But none of them is very obvious. Among 20 kinds of patterns of 53 individuals in 5 communities, only 7 kinds have the obvious differentiation, in which 2 couples have reaches the extremely obvious level, 8 couples have revealed the direct relationship and 4 couples have inverse relationship. The results of the Variance and cluster analysis... |
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