徐州城市绿地土壤肥力质量评价

Fertility quality assessment of urban green space soils in Xuzhou city

通过野外调查和室内分析相结合的方法,研究了徐州市域不同绿地类型下土壤的理化特性。结果表明:徐州城市绿地0～20 cm土层的土壤密度平均为1.25 g/cm3,≥20～40 cm的为1.33 g/cm3,60%以上的土壤密度偏大,对城市绿地植物的生长有一定影响;徐州城市绿地土壤总体呈碱性,pH在7.5～8.5的约占93%;土壤有机质、全氮和速效磷含量普遍较低,速效钾含量丰富。0～20 cm土壤综合肥力指数(P)大小依次为公园绿地(1.45)、防护绿地(1.42)、道路绿地(1.37)、生产绿地(1.18)、街头绿地(1.17)、附属绿地(1.07)。各个绿地类型0～20 cm土壤的肥沃程度均处于中等水平(1.0<P<1.5),在≥20～40 cm土层,防护绿地、公园绿地和街头绿地处于中等水平,其他3种绿地处于较差水平(P<1.0)。

Physical and chemical properties of urban green space soils from different functional areas in Xuzhou city were studied by field investigation and laboratory analysis.The results showed that the average soil bulk density from 0 to 20 cm soil layer in Xuzhou city was 1.25 g/cm3,1.33 g/cm3 from 20 to 40 cm,and 60% of soil bulk density were too high,soil bulk density would affect on the growth of plants to some extent.The urban green space soils in Xuzhou were generally alkaline,93% of the soils pH varied from 7.5 to 8.5.Soil organic matter,total nitrogen and available phosphorus were low,available potassium was rich.Soil integrated fertility index（P） from 0 to 20cm varied in the order of park green space（1.45）,protective green space（1.42）,road green space（1.37）,production green space（1.18）,roadside green space（1.17） and attached green space（1.07）.Soil integrated fertility from 0 to 20 cm of all the functional areas was medium（1.0P1.5）.Soil integrated fertility from 20 to 40 cm of protective green space,park green space and roadside green space were medium,other three green space soil were lower（P1.0）.