| Wetland has rich environmental benefits and functions, which provides indispensible resources for human life and production and has advantages that can not replaced by other ecosystems.Wetland ecosystem health assessment is the new concept and new field in the area of wetland research.This thesis,based on the latest researches on wetland health evaluation from home and abroad,selected and modified the American wetland assessment system(Level Ⅰ, Level Ⅱ, LevelⅢ), assessed the health condition of Dahuangpu Wetland Reserve,Wuqing District,Tianjin.The whole evaluation process has been shown, the evaluaiton accuracy among three levels was testified.At last, the problems and management advices for Dahuangpu were proposed. The main research results and conclusions are as follows:1. In the main part of the thesis,modified assessment system (Level Ⅰ, Level Ⅱ, LevelⅢ) was used to evaluate the health condition of Dahuangpu reserve: In Level Ⅰ evaluation, human activity disturbance indicators were added to the system besides landscape development intensity(LDI) and synoptic approach; In Level Ⅱ, vegetation biomass and soil fertility were chosen as indicators of rapid assessment method to evaluate the research area;In LevelⅢ, richness of the main protected objects in Dahuangpu(wetland plants and birds) were aimed to reflect and evaluate the health condition of the wetland reserve.2. The assessment results showed that the core area of Dahuangpu reserve,especially the south core area was more healthier than the northwest,middle and south parts of the reserve.The areas with low health condition are full of villages, people and factories which discharge waste water,solid waste and waste gas to the environment that will definitely threaten the wetland ecosystem and birds.3. Based on the evaluation result of LevelⅢ, results of Level Ⅰ and Level Ⅱ were testified.It shows that the overlap rate of Level Ⅰ and LevelⅢwas33.68%, and the overlap rate of Level Ⅱ and LevelⅢwas47.74%. |
PDF Full Text Request