Study On Charophyte Community And Its Relationship With Environment Factors In Lake Erhai And Lake Xihu

Charophyte is a kind of ancient algae, is one of the important component and species resources of aquatic ecosystems. The most abundant Charophyte resources were found in Yunnan-Guizhou Plateau in China,but now it is reported that the distribution and biodiversity have become degenerating increasingly.To study the effects of environmental factors on the community of Charophyte, We selected Lake Erhai and Lake Xihu in Yunnan Province as the researched areas, to sampled its submerged plant communities and monitored the relevant environmental factors, follow is results.1.collected and registered 19 species of the submerged plants in Lake Erhai and Lake Xihu, attributed family 7, genus 10, among which Characeae amount 5 species and share 2 genus, such as Chara(Chara connivens, Chara braunii, Chara tenuispina, Chara inconnexa); Nitella(Nitella globulifera).Its mostly living in bay of Shaping, Xiahe, in Erhai, Chara braunii is principal species; and full of Xihu, mostly heart and east region of lake. Chara tenuispina is principal species.2.Charophyte seed banks mostly distributing bay of Shaping, Xiahe, etc. in Erhai, Chara connivens and Chara vulgaris is principal species; and full of Xihu, Chara tenuispina and Chara braunii is principal species.3.Canonical correspondence analysis (CCA) was used to analyze the relationship of the high submerged plant communities with the environmental factors. Principal components analysis(PCA) was used to analyze the relationship of the Charophyte communities with the environmental factors. The results showed that, dissolved inorganic carbon (DIC) and rate of its component, water total hardness, had a significant effect on Charophyte Community. Its origined of water pH was promoting caused by water eutrophication.