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首页> 外文期刊>Waste management & research >Speciation of lipids and humus-like colloidal compounds in a forest soil reclaimed with municipal solid waste compost
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Speciation of lipids and humus-like colloidal compounds in a forest soil reclaimed with municipal solid waste compost

机译：用城市固体废弃物堆肥处理过的森林土壤中脂质和类腐殖质胶体化合物的形态

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摘要

The progressive transformations of lipid and humus-like fractions in soil after massive input (400 Mg ha~)of urban waste have been studied during an 87-week experiment in field plots of a degraded Calcic Regosol in Central Spain.Structural changes in the macromolecular fractions were small when compared with the qualitative and quantitative changes in lipid composition. The intense depletion of the lipid fraction with time and the decrease of the humic acid to fulvic acid ratio were the most significant quantitative indices of the compost transformation in soil. Changes in soil lipid fractions were especially noted in relation to their speciation status and distribution patterns (carbon preference index and relative chain length). There subfractions were considered:(I) direct extraction with petroleum ether,(II) liquid-liquid extraction after soil treatment with 2M H_3PO_4 and (III)after soil treatment with 0.1M NaOH.Although lipid concentration tends to decrease with time, lipids in the fraction tightly bonded to soil (III)remained qualitatively and quantitatively constant in the course of the field experiment. Gas chromatographic-mass spectrometric analyses showed that the more stable the association of lipid to the soil matrix, the fewer the changes observed in the distribution pattern of the fatty acids during the progressive transformation stages.
机译：在西班牙中部退化的雷哥go钙的田间试验中，在一项为期87周的实验中，研究了大规模输入（400 Mg ha〜）城市垃圾后土壤中脂质和腐殖质样组分的逐步转化。与脂质组成的定性和定量变化相比，馏分较小。脂质组分随时间的大量消耗和腐殖酸与富里酸的比率的降低是堆肥在土壤中转化的最重要的定量指标。尤其要注意土壤脂质组分的变化与物种形态和分布模式（碳偏好指数和相对链长）有关。考虑了以下分馏：（I）用石油醚直接萃取，（II）用2M H_3PO_4处理后液-液萃取，和（III）用0.1M NaOH处理后的液化。在田间试验过程中，与土壤（III）紧密结合的部分在质量和数量上保持恒定。气相色谱-质谱分析表明，脂质与土壤基质的缔合越稳定，在逐步转化阶段脂肪酸分布模式中观察到的变化就越少。

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