Study On The Characteristics Pollution And Ecological Restoration Of The Tongyang River, Chaohu Lake

Lake-inlet pollution river is the main source of the pollution of lake. Most point-source and area-source pollution is coming from the lake-inlet river. So it is very important to reduce the amount of pollution of lake-inlet river and control the lake eutrophication.The article is focus on chaohu and Tongyang river, according to the filed-work, setting up 6 sampling section, collecting 36 water samples and 40 plant samples during Oct. and December of 2008 and March, May, July, November of 2009. Analysis and testing the samples in nitrogen and phosphorus nutrient content by spectrophotometry and systematically researching the variation and distribution of nitrogen and phosphorus nutrient in Tongyang river as well as the two kinds of typical plants(Altemanthera philoxeroides and Trapa bicornis) to propose the configuration of Ecological restoration of plant communities of Tongyang river. The result shows:(1) Tongyang river's water shows alkalescent, PH 7⁸. The Do is increasing gradually from upstream and downstream.,CODMn,NH4+-N,NO3--N,NH4+-N,TN,TP is decreasing gradually.(2) After analysis of nitrogen and phosphorus nutrient in plants sample, the Absorptive capability of Trapa bicornis for NH-N, TN, TP is better than Altemanthera philoxeroides but the Absorptive capability for NO-N and nitrite-nitrogen is better than Trapa bicornis(3) Correlativity analysis shows: The correlativity of NH₄⁺-N,NO₃^--N,NO₂^--N,TN and TP in Tongyang river shows significant relation and very significant relation of each other. After correlativity analysis of plant samples and water samples shows that the correlativity relation between Altemanthera philoxeroides ammonia nitrogen content and water ammonia nitrogen content is Significant correlation, no significant correlation with TP in water. The correlativity relation between Nitrate, nitrite nitrogen, total nitrogen and total phosphorus in Altemanthera philoxeroides and Nitrogen and phosphorus nutrients in water shows significant or highly significant correlation. The correlativity between Ammonia, nitrate, total nitrogen and total phosphorus and Nitrogen and phosphorus nutrients in water shows significant or highly significant correlation. Trite nitrogen and trite nitrogen in water is shows no correlativity.(4) According to the variation rules of nitrogen and phosphorus nutrients in Tongyang river and the relative analysis of pollutant degradation with the hydrophytic vegetation season shows that hydrophytic vegetation has direct effect to the water quality of Tongyang river.(5) On the base of investigation and experiments, suggesting the propose of vertical vegetation construction of Tongyang river to make Tongyang river form a vertical and self-adjusting ecological system alone the river which including aquatic zone, wet zone and terrestrial zone.