Study On Screening And Adaptability Of Green Woody Plants Of Landfill Sites In Shanghai

Landfill is not only a polluted area in city, but also an important resources to urban development. Therefore, it is necessary to carry on the vegetation restoration and reconstruction of the plants, and appropriate choice of plants and soil amendent is the key.Based on different treatments(plant soil,mulching greenery waste,zeolite) on soil samples(No.â… ,No,â…¡,No.â…¢) from the Laogang Garbage Landfill, the study took Elaeagnus pungens,Ligustrum Lucidum,Nerium oleander,Distylium racemosum,Forsythia suspensa,Photinia serrulata as research objects. The effect of different treatments on morphological changes,physiological indexes and accumulation of heavy metals had been studied. The experiment was to find plants with stress resistance and the best soil amendment. The results were as follows:1 The conditions of soil samples from the Laogang Garbage Landfill were different. Among the tree samples, both the contents of heavy metals and nutrient level of No.â…¡were low. The contents of heavy metals and nutrient level of No. I were between No.â…¡and No,â…¢. Comprehensive pollution index of the tree samples were high which indicated that all of them are heavily polluted.2 The survival ratio of the plants Ligustrum Lucidum,Nerium oleander,Elaeagnus pungens were higher than other plants. Elaeagnus pungens> Nerium oleander> Ligustrum Lucidum> Photinia serrulata> Distylium racemosum> Forsythia suspense. The survival ratio of Forsythia suspense is zero when planted on the three samples. There were only survival plants of Distylium racemosum on No. II. As a result, the growth ability of both Forsythia suspensa and Distylium racemosum were weak under environmental stress.3 The survival ratio of the same plants under the Treatment "planting soil+ garbage soil" was higher than other treatments. A certain proportion of garbage soil and planting soil can decrease the content of soil heavy metal. The effect were better when the propotion of planting soil were higher.4 The main factor analysis method was employed to analyze the relationship between eight heavy metals and six soil physicochemical index of different treatments. Divided into three factors, the first factor was nutriment, the second factor was overweight heavy metals and the third factor is standard heavy metals. So the restricted factor of plants were nutriments and overweight heavy metals. 5 Along with the increase concentration of pollutants, proline content increased. While CAT activity decreased. The effect of mulching greenery waste are better than zeolite. Different plants under the same treatment during the same period, each index determination value also had difference,...