Abstract:

As the basis for plant growth, soil quality directly determines the success or failure of landscaping in urban areas. To understand the impact of conditioners on soil quality, we selected typical relocation site soil as the research object, and studied the impact on physical and chemical properties of the soil under different conditioners, different application methods and different time. The results showed that after applying different conditioners, each conditioner could effectively reduce the pH and increase the EC value of the relocated soil within a period of time, while the organic matter and total nitrogen of the soil had a tendency of decreasing to a certain extent, among which the decrease of Fe-S treatment was the most significant, while other treatments were not obvious; the impact of each conditioner on soil physical properties did not demonstrate clear improvement, which was mainly observed in the reduction of total soil porosity, non-capillary porosity and capillary porosity, increase of soil bulk density, decrease of soil infiltration rate, maximum water holding capacity and capillary water holding capacity. And among these treatments, M-S showed relatively poorer results; each treatment reduced the seed germination index, but the difference was not obvious, and the Fe-I treatment had poorer results than other treatments. The application of conditioner can improve the chemical properties of the soil in urban relocation site to a certain extent, but it is not obvious to improve the physical properties of the soil. Therefore, to achieve the desired effect of improving both the physical and chemical properties of the soil, it is suggested that the conditioner should be mixed with organic amendment materials.

Key words: soil quality, soil conditioner, urban relocation site, physical properties of the soil, chemical properties of the soil, landscape gardening