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    园林绿化废弃物覆盖对城市绿地土壤肥力影响

    Effects of landscaping waste mulching on soil fertility of urban green space

      摘要
    • 摘要:
        目的  本研究旨在探讨园林绿化废弃物覆盖对城市绿地土壤肥力影响，以期为园林绿化废弃物资源化利用解决城市绿地土壤问题提供依据。
        方法  本研究以北京市典型城市绿地土壤−圆明园为研究对象，通过野外试验设置4种不同处理：不覆盖（CK）、上层木片 + 下层堆置15 d的园林绿化废弃物堆肥（处理A）、上层木片 + 下层堆置30 d的园林绿化废弃物堆肥（处理B）、上层木片 + 下层堆置60 d的园林绿化废弃物堆肥（处理C），进行室内分析测定，结合修正的内梅罗指数法计算土壤综合肥力指数，运用Pearson相关性及逐步回归分析，分析不同覆盖处理对土壤综合肥力的影响。
        结果  0 ~ 10 cm土层中，C覆盖处理显著提高土壤有效磷、速效钾含量（P < 0.05）；10 ~ 20 cm土层中，C覆盖处理显著提高土壤速效钾含量（P < 0.05）。土壤综合肥力指数显示，C覆盖处理显著提高0 ~ 10 cm土层的综合肥力（P < 0.05）。修正的内梅罗指数法中Fimin值及逐步回归分析表明，土壤综合肥力限制因子为土壤密度及有效磷，土壤综合肥力最主要影响因子为有机质，其次为土壤有效磷及土壤密度。
        结论  综上，园林绿化废弃物覆盖对土壤理化性质及综合肥力有不同程度的影响，结果显示处理C为最佳覆盖方案，今后研究中要着重注意土壤肥力主要影响因子（土壤有机质、土壤密度及有效磷）的动态变化及改善。

       

      Abstract:
        Objective   This study aimed to explore the impact of landscaping waste mulching on soil fertility of urban green spaces, in order to provide a basis for the resource utilization of landscaping waste to solve urban green space soil problems.
        Method  The Old Summer Palace, a typical urban green space soil in Beijing, was taken as the research object. Through field experiments, four different treatments were set up: no covering (CK), the upper layer was wood chips + the lower layer was landscaping waste compost for 15 d (A), the upper layer was wood chips + the lower layer was landscaping waste compost for 30 d (B), the upper layer was wood chips + the lower layer was landscaping waste compost for 60 d (C), and then analyzed and measured in the laboratory. Combined with the modified Nemerow index method, the comprehensive soil fertility index was calculated. Pearson correlation and stepwise regression analysis were used to analyze the effects of different mulching treatments on soil fertility.
        Result  In 0−10 cm soil layer, the contents of soil available phosphorus and available potassium were significantly increased by C mulching treatment (P < 0.05); in 10−20 cm soil layer, the content of soil available potassium was significantly increased by C mulching treatment (P < 0.05). The comprehensive fertility index of soil showed that the comprehensive fertility of 0−10 cm soil layer was significantly improved by C mulching treatment (P < 0.05). The Fimin value in the modified Nemero index method and stepwise regression analysis showed that the limiting factors of soil comprehensive fertility were soil bulk density and available phosphorus, soil organic matter was the most important factor affecting soil comprehensive fertility, followed by soil available phosphorus and soil bulk density.
        Conclusion   In conclusion, landscaping waste mulching had different degrees of influence on soil physicochemical properties and comprehensive fertility. The results show that treatment C is the best mulching scheme. In the future research, we should pay more attention to the dynamic change and improvement of the main influencing factors of soil fertility (soil organic matter, soil bulk density and available phosphorus).

       

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