延安新区(北区)道路绿地土壤肥力质量评价

Soil Fertility Evaluation for Urban Greenbelt in the New District of Yan'an

以延安新区(北区)道路绿地土壤为研究对象,测定土壤理化指标,参照全国第二次土壤普查分级标准和内梅罗指数法对研究区域土壤进行综合肥力评价,为当地道路绿化建设提供依据和建议。结果表明:土壤有机质(均值14.37 g/kg)和速效钾(均值53.00 mg/kg)均属于4级、含量低的水平;碱解氮(均值34.28 mg/kg)属于5级、含量很低的水平,速效磷(均值2.64 mg/kg)属于6级、含量极低的水平。土壤p H 8.25~9.39,土壤总体上呈碱性-强碱性。容重为1.02~1.73 g/cm3,土壤紧实度较高。总盐为0.45~1.48 g/cm3,土壤盐渍化现象较突出。内梅罗综合肥力指数分析表明延安新区(北区)行道树土壤处于四级、肥力贫瘠水平(<0.9)。根据以上结果,可采用增施有机肥和化学肥料、种植绿肥植物、改良土壤碱性等措施来进行绿地土壤管理。

Greenbelt soil in the new district of Yanan was studied by physicochemical indexes measurement,and the fertility was evaluated according to the classification criteria for soil nutrients in The 2 ndNational SoilSurvey and Nemorrow formula, to provide a basis for road greening. The results indicated that soil organicmatter and available potassium were in grade 4（low level） with the average amounts of 14.37 g/kg and 53.00 mg/kg, respectively. Available nitrogen was in grade 5（low level） with an average amount of 34.28 mg/kg,available phosphorus was in grade 6（very low level） with an average amount of 2.64 mg/kg. The p H value was8.25-9.39, which was alkali to high alkali. Soil bulk density was 1.02-1.73 g/cm^3, and the porosity was low.The total salt was 0.45-1.48 g/cm^3, soil salinization was serious. The Nemerow analysis showed that the bordertree soil in the new district was in grade 4, poor fertility level（〈0.9）. Based on these results, some measureswere proposed, such as using organic fertilizers, planting green manure plant, improving soil alkaline, toimprove the soil fertility.