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首页> 外文期刊>Chemosphere >Organic Residues As Immobilizing Agents In Aided Phytostabilization: (ii) Effects On Soil Biochemical And Ecotoxicological Characteristics
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Organic Residues As Immobilizing Agents In Aided Phytostabilization: (ii) Effects On Soil Biochemical And Ecotoxicological Characteristics

机译：作为有机稳定剂的有机残留物：（ii）对土壤生化和生态毒理特性的影响

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Sewage sludge (SS), municipal solid waste compost, and garden waste compost (GWC) were used as immobilizing agents in aided phytostabilization of an acid metal-contaminated soil affected by mining activities. The organic residues were applied at 25, 50 and 100 Mg ha~(-1) (dry weight basis) and perennial ryegrass (Lolium perenne L.) was used as a "green cover". We studied the effects of the treatments on soil phytotoxicity and enzymatic activities, and on the composition and toxicity of the soil leachate towards Vibrio fischeri and Daphnia magna.rnApplication of SS led to the greatest values of dehydrogenase, acid phosphatase, β-glucosidase, protease and urease activities, corresponding to the greatest overall microbial and biochemical activity in amended soils. Conversely. GWC did not increase these enzymatic activities, relative to the unamended soil, or enhance ryegrass growth. Cellulase activity increased with increasing application rates of the amendments tested, but decreased at the highest SS application rate. The organic amendments were able to suppress soil toxicity to levels that did not affect D. magna, when applied at 50 and 100 Mg ha~(-1), but SS, at the same application rates, increased the soil leachate toxicity towards V. fischeri. Moreover, ryegrass showed some phytotoxic symptoms when 100Mg ha~(-1) of SS were applied. This study showed the importance of an integrated evaluation of soil quality on remediation processes. Although SS immobilized trace metals and corrected soil acidity, improving soil biochemical status, when used at high application rates it led to toxicity of soil leachate towards V. fischeri, decreased soil cellulase activity and impaired ryegrass growth.
机译：污水污泥（SS），城市固体垃圾堆肥和花园垃圾堆肥（GWC）被用作固定剂，以辅助受采矿活动影响的酸性金属污染土壤的植物稳定化。以25、50和100 Mg ha-1（干重计）施用有机残余物，并且将多年生黑麦草（Lolium perenne L.）用作“绿色覆盖物”。我们研究了这些处理对土壤植物毒性和酶活性的影响，以及对渗滤液对费氏弧菌和大型蚤的组成和毒性的影响。和脲酶活性，对应于改良土壤中最大的总体微生物和生化活性。反过来。相对于未改良的土壤，GWC不会增加这些酶的活性，也不会促进黑麦草的生长。纤维素酶活性随所测试的修正剂的施用率增加而增加，但在最高SS施用率下降低。当以50和100 Mg ha〜（-1）施用时，有机改良剂能够将土壤毒性抑制到不影响D. magna的水平，但是在相同施用量下，SS增加了土壤渗滤液对V的毒性。费舍里。此外，当施用100Mg ha〜（-1）的SS时，黑麦草表现出一些植物毒性症状。这项研究表明了对整治过程中土壤质量进行综合评估的重要性。尽管SS固定了微量金属并纠正了土壤酸度，改善了土壤生化状况，但当以高用量使用时，会导致土壤渗滤液对费氏弧菌的毒性，土壤纤维素酶活性降低和黑麦草生长受损。

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