园林绿化用搬迁地土壤肥力综合评价

  目的  以上海典型搬迁地为研究对象，对搬迁地土壤单项肥力指标和土壤综合肥力进行分析，探讨城中村和工业企业搬迁地土壤肥力质量特征，为科学指导搬迁地土壤用于园林绿化提供依据。  方法  选取上海典型的20个城中村搬迁地样点和16个工业企业搬迁地样点，筛选土壤pH、电导率、有机质、碱解氮、有效磷、速效钾和容重等7项指标作为肥力评价指标，采用修正的内梅罗法对搬迁地土壤肥力进行综合评价。  结果  搬迁地土壤呈碱性，电导率适宜，有机质和碱解氮质量分数相对适宜，有效磷和速效钾质量分数丰富，土壤容重大；上海市搬迁地土壤肥力综合指数均值仅为0.86；城中村搬迁地土壤肥力综合指数显著高于工业企业搬迁地(P＜0.05)。  结论  上海搬迁地土壤肥力相对较差，其中59.3%的搬迁地土壤属于差等级，40.7%的搬迁地土壤属于一般等级；城中村搬迁地土壤肥力优于工业企业搬迁地土壤；搬迁地土壤用于城市园林绿化前，应通过技术手段提升土壤肥力以满足绿化种植要求。图5表2参23

Comprehensive evaluation of soil fertility in relocated land for landscaping

  Objective  The objective is to analyze soil fertility index and soil fertility quality in typical relocation sites in Shanghai, and to explore the soil fertility quality characteristics of the relocated land in villages and industrial enterprises in the city, so as to provide basis for the use of the relocated soil in landscaping.  Method  The 20 typical relocation sites of urban villages and 16 relocation sites of industrial enterprises in Shanghai were selected, and 7 soil fertility indexes including pH, electrical conductivity(EC), organic matter, hydrolytic nitrogen, available phosphorus, available potassium and bulk density were selected as fertility evaluation indexes. The modified Nemoro method was used to comprehensively evaluate the quality of soil fertility in the relocation sites.   Result  The soil in the relocation site was alkaline, with suitable EC, relatively low contents of organic matter and hydrolytic nitrogen, rich contents of available phosphorus and available potassium, and high soil bulk density. The average comprehensive index of soil fertility in Shanghai was only 0.86. The comprehensive index of soil fertility in the relocation sites of urban villages was significantly higher than that in the relocation sites of industrial enterprises (P＜0.05).   Conclusion  The soil fertility in the relocation sites of Shanghai is relatively poor, 59.3% of which belong to “poor” grade and 40.7% belong to “general” grade. The soil fertility of urban villages is better than that of industrial enterprises. Before the relocated land is used for urban landscaping, soil fertility quality should be improved by technical means to meet the requirements of planting. Ch, 5 fig. 2 tab. 23 ref.]