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首页> 外文期刊>Chemosphere >Organic Residues As Immobilizing Agents In Aided Phytostabilization: (i) Effects On Soil Chemical Characteristics
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Organic Residues As Immobilizing Agents In Aided Phytostabilization: (i) Effects On Soil Chemical Characteristics

机译：作为有机稳定剂的有机残留物：（i）对土壤化学特性的影响

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A greenhouse experiment was conducted to evaluate the effect of three different organic residues, sewage sludge (SS), municipal solid waste compost (MSWC), and garden waste compost (GWC), as immobilizing agents in aided phytostabilization of a highly acidic metal-contaminated soil, affected by mining activities, using perennial ryegrass (Lolium perenne L.). The organic residues were applied at 25, 50 and 100Mg ha~(-1) (dry weight basis), and their effects on soil chemical characteristics and on relative plant growth and metal concentrations were assessed. All the organic residues tested immobilized Cu, Pb and Zn, decreasing their mobile fractions. This was corroborated by negative correlations obtained between mobile Cu, Pb and Zn and other soil chemical characteristics, which rose as a consequence of the amendments applied (i.e., pH, electrical conductivity, organic matter, nitrogen content, available P and available K), and by the multivariate exploratory techniques performed that showed an inverse correlation between these groups of variables. The greatest increase in ryegrass relative growth (more than three times) was obtained in the presence of 50 Mg MSWC ha~(-1) followed by SS at the same application dosage. GWC did not contribute to an increase in shoot growth, due to its small capacity to correct soil acidity and to supply essential macronutrients (N, P, K). No extractant was able of demonstrating by a linear correlation the uptake of Cu, Pb and Zn by ryegrass. This plant was therefore not a good "indicator" of Cu, Pb and Zn availability in the soil. The results obtained in this study suggest that ryegrass can be used in aided phytostabilization for this type of mine contaminated soils and that MSWC, and to a minor extent SS, applied at 50 Mg ha~(-1) were effective in the in situ immobilization of metals, improving soil chemical properties and leading to a large increase in plant biomass.
机译：进行了温室实验以评估三种不同的有机残留物，作为固定剂在高酸性金属污染的辅助植物稳定中的作用，这些残留物是污水污泥（SS），城市固体废物堆肥（MSWC）和花园废物堆肥（GWC）多年生黑麦草（Lolium perenne L.）受到采矿活动影响的土壤。以25、50和100Mg ha〜（-1）（以干重计）施用有机残留物，并评估它们对土壤化学特性以及相对植物生长和金属浓度的影响。测试的所有有机残留物均固定了Cu，Pb和Zn，从而降低了其移动分数。流动的铜，铅和锌与其他土壤化学特性之间的负相关性证实了这一点，这些相关性由于应用的修正（例如，pH，电导率，有机质，氮含量，有效磷和有效钾）而上升，并且通过多变量探索技术进行的研究表明，这些变量组之间存在反相关关系。黑麦草相对生长的最大增加（超过三倍）是在存在50 Mg MSWC ha〜（-1），然后以相同的施用剂量添加SS的情况下获得的。由于GWC校正土壤酸度和提供必需的大量养分（N，P，K）的能力较小，因此它不能促进苗木生长。没有提取剂能够通过线性相关性证明黑麦草对Cu，Pb和Zn的吸收。因此，该植物不是土壤中铜，铅和锌有效性的良好“指示剂”。这项研究获得的结果表明，黑麦草可用于这种矿井污染土壤的辅助植物稳定，并且在50 Mg ha〜（-1）的条件下，MSWC和少量SS可有效地原位固定。金属，改善土壤化学性质，并导致植物生物量大幅增加。

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