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    园林绿化废弃物堆肥对土壤有机碳组分影响

    Effects of green waste compost on soil organic carbon fractions

      摘要
    • 摘要:
        目的  研究园林绿化废弃物堆肥对土壤有机碳组分影响，为精准提升土壤肥力质量提供一定理论基础。
        方法  以北京市副中心林地土壤为研究对象，设置4种施肥方案，即不施肥（NF）、氮磷钾单施（MF）、园林绿化废弃物堆肥单施（GF）、氮磷钾和园林绿化废弃物堆肥混施（MF+GF），每种施肥方案氮磷钾施入量均为N 10 g/kg、P2O5 1.5 g/kg、K2O 5 g/kg，分别在施肥后1、3、6、9、12个月采集土壤样品，进行土壤有机碳组分研究。
        结果  不同施肥方案下，土壤富里酸碳、胡敏素碳和球囊霉素碳含量均呈现先增高后降低的趋势，在施肥后1个月达到最高，分别为0.98、5.03 g/kg和215.48 mg/kg。施肥1年后，土壤富里酸碳、胡敏酸碳、可溶性碳、碳水化合物和球囊霉素碳含量均表现为在GF和MF+GF方案下最高，而土壤胡敏素碳含量则表现出在MF方案下最高。施肥对球囊霉素碳的敏感性显著高于其他有机碳组分，敏感性指数4.80% ~ 229.03%。MF方案对土壤有机碳组分最不敏感，GF方案显著提高了土壤胡敏酸碳，胡敏素碳和球囊霉素碳敏感系数，MF+GF方案提高了土壤可溶性碳，富里酸碳和碳水化合物敏感系数。土壤球囊霉素碳与全氮和有效磷含量线性相关系数最高，分别为0.703 8和0.867 6。土壤碳水化合物与硝态氮和速效钾线性相关性系数最高，分别为0.524 6和0.586 9。
        结论  不同施肥方案对土壤碳组分均有影响，球囊霉素是有机碳组分最敏感指标，且与土壤全氮、有效磷含量线性相关性较强，可作为苗木施肥管理过程中衡量土壤肥力的指标。

       

      Abstract:
        Objective  This paper aims to study the effects of green waste compost on soil organic carbon fractions, which provide a theoretical basis for accurately improving the soil fertility quality.
        Method  Taking Beijing sub-center forest soil as the research object, and the experiment consisted of four fertilization schedules, i.e. no fertilizer (NF), mineral NPK fertilizer (MF), green waste compost fertilizer (GF), mineral NPK fertilizer plus green waste compost fertilizer (MF+GF). The amount of N, P and K applied in each fertilization scheme was 10 N, 1.5 P2O5, 5 K2O g/kg. Soil samples were collected after fertilization 1, 3, 6, 9, and 12 months, respectively, to determine soil organic carbon fractions.
        Result  Under different fertilization schemes, soil FAC, HMC and GRSPC content showed increasing first and then decreasing, and reached highest after fertilization 1 month, which were 0.98, 5.03 g/kg and 215.48 mg/kg. After fertilization 1 year, soil FAC, HAC, DOC, carbohydrates and GRSPC content showed highest under GF and MF+GF schemes. However, HMC content was the highest under MF scheme. The sensitivity of GRSPC was significantly higher than other organic carbon fractions under different fertilization schemes, which was 4.80%−229.03%. MF scheme was the least sensitive to soil organic carbon fractions. GF scheme significantly increased the sensitivity index of soil HAC, HMC and GRSPC, and MF+GF scheme increased the sensitivity index of soil DOC, FAC and carbohydrate. The relationship between soil GRSPC and TN, AP had highest linear correlation coefficients, which were 0.703 8 and 0.867 6, respectively. The relationship between soil carbohydrate and NO3-N, AK had highest linear correlation coefficients, which were 0.524 6 and 0.586 9.
        Conclusion  Different fertilization schemes had impact on soil organic carbon fractions. GRSPC was the most sensitive index of organic carbon fractions, and had highest correlation with soil TN and AP, which could be used as an index to measure soil fertility during forestry fertilization management.

       

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