Investigate And Effects Analysis To Reeds In Taihu Lake

In recent years, there are some conditions appeared generally , such as the lakes withered up,water level came done,the quantity of water rapidly declined,lake water Stalinization,water quality contamination,eutrophication, and even dried up or died out ,which due to the intensify of human activities and the world's climate changing. So the author devoted to studying recovering the water body and screening aquatic plants that have strong adaptability,could repair themselves and have little safety potential to living things.Through researching the water quality and aquatic plants of Taihu , according to many documents related that studying the mechanism of aquatic plants to improve the water quality, we screened the edificators in Taihu area ----reed as object of study ,and also chose four sample plots in Taihu Suzhou Wuzhong segment ,measured the types of aquatic plants , researched the live weight of aquatic plants, analyzed the amount and diversity of aquatic plants and the PH value,transparency,total phosphorus(TP),total nitrogen(TN),chlorophyll a,nutrient index,eutrophy condition and so on , and also analyzed Nitrogen and Phosphorus index of bottom sediment, reaching the following conclusions:1,Through observing, the reed plant's height increase with the water deep .It's on account of that reed need to stick out from water surface as a kind of large-scale emergent vegetation, to gain carbon dioxide and illumination to conduct Photosynthesis, and deliver oxygen to root system to breathe and oxidizing rooting zone.2,During the whole year,the transparency of water body is autumn>summer>spring>winter. In June and September, the transparency of lake water is the best.3,There is prominent relation between organic matter,Nitrogen content measured form soil profile on sample plot and the deep of sampling, these content both reduce as the deep raise. 30 centimeter is one of it, where is usually plough pan in agricultural soil-working, the water permeability and air permeability is bad, and it's the dividing point of content changing.4,Water body eutrophication condition in sample region has a little mend in march and September ,when is the plant growing season , it because that plant growing decrease the concentration of nutritive material as Nitrogen and Phosphorus.5,Form march to September ,the Nitrogen content in leaves present an increasing tendency, experiment indicate that ,reed in growing early days has the strongest ability to absorb Nitrogen and Phosphorus, so in growing infancy, the content of Nitrogen and Phosphorus can just reach the highest value during the whole year.