上海城市绿地景观改造区域表土剥离和再利用

Research on Surface Soil Stripping and Reuse in Shanghai Urban Green Space Landscape Renovation Area

  • 摘要: 于2021年,基于上海植物园北区改扩建工程,对改造区域内绿地0—20、20—40、40—60、60—100 cm土壤进行取样,测定土壤pH、EC、有机质、碱解氮、有效磷、速效钾,以及土壤容重、孔隙度和微生物多样性等土壤肥力关键指标。研究结果表明,0—60 cm土壤pH和容重超过《绿化种植土》标准要求,60—100 cm土壤仅有效磷和速效钾达到标准要求。利用主成分分析法对各土壤综合肥力进行评价,结果表明随着土层深度的增加土壤综合肥力呈降低趋势。综合结果表明,0—60 cm土壤可直接一体剥离用作绿化种植土,60—100 cm土壤可用作地形营建的底土。研究结果可为城市绿地景观改造区域可剥离表土分类评价和再利用提供参考。

     

    Abstract: Based on the renovation and expansion project of the northern area of Shanghai Botanical Garden,soil samples were taken from green spaces within the renovation area in 2021.The depths of soil sampling were stratificated as follows:0 to 20,20 to 40,40 to 60,and 60 to 100 cm.Soil pH,EC,organic matter,available nitrogen,available phosphorus,available potassium,as well as key soil fertility indicators such as soil bulk density,porosity,and microbial diversity were measured.The research results indicated that the pH and bulk density of 0—60 cm soil exceed the requirements of the Green Planting Soil standard,while only available phosphorus and available potassium meet the standard requirements of 60—100 cm soil.The principal component analysis method was used to evaluate the comprehensive fertility of each soil,and the results showed that the comprehensive fertility of the soil showed a decreasing trend with the increase of depth.The comprehensive results indicate that 0—60 cm soil can be directly peeled off as green planting soil,and 60—100 cm soil can be used as subsoil for terrain construction.The research results can provide reference for the classification evaluation and reuse of peelable topsoil in urban green space landscape renovation areas.

     

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