Study On Quantitative Ecology Of Wetland Vegetation In Sanggan River Valley, Shanxi

Sanggan River is the second largest river in Shanxi, which belongs to Haihe water system i.e. one of the trunk streams of Yongding River. Because of complex physiognomies and ecological environments, various kinds of wetland develop in Sanggan River valley.Wetland vegetations in the Sanggan River valley, including the floristic diversity of wetland vegetation, the interspecific relationship of plant communities, the relationships between plant communities and environments were studied, respectively.There are 101 species of vascular plants in the vegetations, which belong to 77 generas and 31 families. The hygrophyte, the hydrophyte and the mesophyte play an important role in the floristic elements. North Temperate type (29 generas ) is account for dominant position in the floristic geographical elements of genera. Moreover, the temperate Asia species (30 species ) dominate in the floristic geographical elements of species. It means the wetland vegetation has obvious temperate character.The interspecific association and correlation of 36 dominant species of the wetland vegetation were analyzed by using x2-test, Pearson's coefficient and Spearman's coefficient. The results shown that those dominant populations composed 630 species-pairs; among the 36 species were herbs, and the higher significant association's or correlation of species-pairs were 49, 88, 71, respectively, moreover, the significant association's or correlation of species-pairs were 31, 9, 7, respectively. Why those species-pairs shown positive association or correlation was that they had the similar biological characters and the similar eco-adaptive and segeration niche. Why the species pairs shown negative association or correlation was that they had different ecological characters, different adaption and overlapping niche.The ecological relationship between vegetation and environment was analyzed by using TWTNSPAN and DC A. 19 Associations were produced by TWINSPAN. The first axis of DCA indicated the water gradient of soil while the second axis reflected the altitude gradient. The moisture of soil descend from left to right, while the altitude ascend from down to up.Owing to both natural and human activity disturbance, the wetland in Sanggan River valley is facing severe threaten. For perfecting the wetland resources and realizing sustainable development in the valley, we not only manage to pertecte the wetland, but also restorate and reconstructe the damaged wetland. Finally, the scientific strategies for restoration and reconstructe of the dameged wetland were discussed.