Analysis On Quality Indicators And Quality Assessment Of Urban Forest Soil

The bulk density of soil from 0~20cm was high, while the porocity and aeration were low. The main types of soil texture were silt loam which accounts for 60.42%, silt, silty clay loam, loam, loamy sand, and sandy loam. The types of soil was dominated by neutral and alkaline soil. Soil organic matter and total nitrogen had a close relationship(r=0.93,P<0.01), both of which were low in urban forest soil. Soil available phosphorus was enriched in incity forest soil but lacking in suburban natural forest soil. Soil available potassium was enriched generally. Cation exchange capacity(CEC) of soil was high.Microbial biomass carbon (Cmic) was low and distributed irregularly. The mean values of hydrogen peroxidase, dehydrogenase, alkaline phosphatase and cellulase activities were 0.25ml/g, 31.38mg/g, 16.7mg/kg, and 0.0018mg/g, respectively in 0~20cm soils, and 0.31ml/g, 20.91mg/g, 9.5mg/kg, and 0.014mg/g, respectively in 20~40cm soils. Soil types, organic matter, and total nitrogen had great effect on hydrogen peroxidase activities. Organic matter and total nitrogen were positively correlated with dehydrogenase activities.Erodibility K value of urban forest soil was high, but soil and water stable index and permeability were low. Urban forest soil has week erosion-resistant capacity and is easy to erode and loss.Bulk density, texture, pH, organic matter, available potassium, and cellulase activities were selected to constitute minimum data set(MDS) for quality assessment of urban forest soil. The range of modified Nemoro index(Q) of urban forest soil was 0.85~1.51, and mean value was 1.19. The percentage of Q<1.0, 1.0≤Q<1.5, and 1.5≤Q<2.0 were 6.82, 90.91, and 2.27, respectively.Urban forest soil quality management database consisted of a database named soil quality assessment indicators, two datum tables named soil information and user information respectively, four application module named system login, information management, information view, and user management respectively, a system main menu, a system main form, and a help module.