Space-time Variation of Soil Bulk Density and Soil Porosity of Park Greenery Plot in Xuzhou Urban Section

The park greenery plot soil in four city zones within the Third Ring Road of Xuzhou is studied in this paper.By analysis of sampled soil physical properties,compared that with bare area,the results show that: there is no certain change pattern between soil bulk density and soil porosity;the bulk of soil bulk density gets larger and the soil gets deeper,while the soil bulk density gets smaller at certain depth and the capability of sluice falls.Besides,the soil bulk density of park greenery plot soil is larger than that of bare area.The proportion of topsoil of which is maladjustment;the ventilative and penetrated gets poorer.