Study On Vegetation Community Characteristics In Wetland Of Shengjin Lake In Anhui Province

Wetland plants is the first wetland ecosystem productivity, for the maintenance of wetland ecosystem functions and stability of an important role.In addition to wetland plants provide habitat and food resources, clean water and improve water quality, but also with the landscape features and certain economic role. Vegetation composition of the wetland ecosystem to evaluate production potential as well as management of wetland ecosystems necessary basic data. Wetland plant biodiversity for human survival, development is essential, its wetland ecosystem function relationships and its internal mechanism is the current ecology of the major scientific issues. Seasonal growth dynamics of wetland plant study reveals wetland phenological characteristics of plants, and biomass formation process for further development and use of wetlands and plant resources to provide theoretical support and technical basis. Wetland plant community succession is a complex process that reflects the wetland plants and the environment dynamics.Shengjin Lake which lies in the downstream of Yangtze River is an important wintering area of international bird and an important fish fanning base. In order to investigate the rise in recent years, Lake lake, and the plants and vegetation changes in the aquaculture industry to the rise of gold brought about the lake vegetation changes,We Research species composition, spatial distribution, seasonal growth dynamics, community diversity of Wetland plants in Shengjin Lake from 2009.10—2010.11.We investigated the wet beach communities of Shengjin Lake in the fall of 2009 (after flooding) and the spring of 2010 (before flooding).We used Tacha method and sampling method,495 and 328 plots were set in 2 periods. We used plot method, line transect sampling methods and to investigate the aquatic plant of Shengjin Lake. In May,June and September in 2010.We used Simpson index, Shannon—Wiener index, Margalef index and Pielou index to Compare the diversity of wetland plants in Shengjin Lake. We used Mapinfo to draw the distribution of vegetation.There are 184 vascular plant species belonging to 121 genera in 47 families. There are 16 Submerged plant species belonging to 8 genera in 7 families, take up 14.9%,6.6%,8.7% of the toal; 17 floating plants species belonging to 13 genera in 12 families, take up 25.5%,10.7%,9.2% of the toal; 17 aquatic plant species belonging to 14 genera in 9 families, take up 19.1%,11.6%,9.2% of the toal; 134 tidal wetlands plants species belonging to 90 genera in 29 families, take up 61.7%,73.9%,74.4% of the toal.According to the liter Lake wetland plants findings and relevant literature, the liter Lake Wetland vegetation is divided into two subtypes,5 formations and 30 associations. Carex thunbergii Steud and Cynodon dactylon (L.) Pers. is the dominant species in tidal wetlands plants of Shengjin Lake, and its distribution on the rise Lake beach, beach most of the area occupied;Phragmites australis (Cav.) Trin. And Zizania latifolia (Griseb.) Stapf is the dominant species in emergent plants of Shengjin Lake, the reed in the whole lake and scattered most of the beach, mushroom in the lake Tsui Tanjiaqiao to the mountain area, and Yang goose head area, a large area of community distribution;Trapa bispinosa Roxb.is the dominant species Floating plants in Floating plants of Shengjin Lake, in shanghu,zhonghu,xiahu, are widely distributed in shanghu,xiahu, less distribution in zhognhu;Ceratophyllum demersum L. was the dominant species in Submerged plants of Shengjin Lake, its distribution from Hengzhou to Landaocheng in Shanghu, and scattered in Zhonghu and Xiahu.From 1970s, the Trend of the dominant species of aquatic plants in Shengjin Lake:Potamogeton malaianus Miq.+ Vallisineria natans (Lour.) Hara.+ Trapa bispinosa Roxb. stageâ†'Potamogeton malaianus Miq.+Ceratophyllum demersum L.+ Trapa bispinosa Roxb. stageâ†'Potamogeton malaianus Miq.+ Vallisineria natans (Lour.) Hara.+Potamogeton crispus L.+ Myriophyllum spicatum L.+ Trapa bispinosa Roxb.stageâ†'Potamogeton crispus L.+Ceratophyllum demersum L.+Myriophyllum spicatum L.+ Trapa bispinosa Roxb.stageâ†'Ceratophyllum demersum L.+ Trapa bispinosa Roxb.stage, the dominant species of aquatic plants in lakes transform from submerged plants to the floating plants.