Eco-environmental Quality Assessment Of Shanghai Pao-taiwan Wetland Forestry Park

The author of this paper analysed some successful cases on the reconstruction of the industrial wasteland in the world and researched the changes of the eight heavy metals contents, pH value and EC value of the soil with different depth in two years by field survey, samples analysis and questionnaire survey. The rich collection characteristics of the six plants to the eight heavy metals were also researched. And plant growth conditions, plant arrangement mode during the first period of reconstruction were analyzed. The results were as the followed:1) There are poor soil qualities in no- improved area in the Park of first construction stage. It is not suitable for plant growth. The content of Cd is excessive (the average content was 0.7451 mg/kg, 1.24 times of the contrast samples, the rate of exceed was 60%), and the content of other six heavy metals are all lower than the average background soil which in Shanghai and Baoshan District. pH value of soil on average still 11.0 was strongly alkaline; EC and PH value changes of the value of positive relationships.2) The Variation of heavy metals contents, pH value and EC value until two years after rebuilding is that :The contents of Cd in the 50cm depth soil declined 20%. The contents of Cr and Zn raised 87% and 230% significantly. And the other metals did not change significantly. Compared between the different areas, the heavy metals in soil was positively correlated with the depth. The pH value in the 50cm depth soil declined from 9.06 to 8.10 between two years. And EC value declined 89%-90%.3) The overall growth status of trees in the park were middle. The rich collection characteristics of heavy metals in Camphor and Holly were obvious than that in the other four plants which were growing worse. We suggested selecting the plants which were alkali resistant and strong of heavy metal tolerance. And reducing the plants which growth statuses were bad. 4) In garden plants configuration mode, terrestrial plants, arbor and shrub, should be abundant configured. Aquatic plants and lianas should be increased. The configuration mode need to be adjusted and optimized to avoid be too closed or be too void in the park.5) Random survey was made. Most visitors, 89% of all, agreed the Ecological Landscape in the park. And 83% agreed the water, air, biodiversity, etc. in the park. They also made pertinent suggestions to the inadequacies of the ecological environment.6) The heavy metal treatment and improvement program of the Parkâ…¡were been described. And the lower of the heavy metal contents, pH value and EC value by improve the soil and plant restoration. In accordance with the "matching tree" principle, choose the plants which were strong resistance, strong adsorption and transportation of heavy metals.It is benefit to the program design and transform rebuilding of the wetland Forest Park of Pao-Taiwanâ…¡.And the results of the research were used to administer the industrial waste land, promoting ecological landscape environment for reconstruction, to achieve sustainable development indicator.