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首页> 美国卫生研究院文献>Heliyon >Do soil amendments used to improve agricultural productivity have consequences for soils contaminated with heavy metals?
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Do soil amendments used to improve agricultural productivity have consequences for soils contaminated with heavy metals?

机译：用于提高农业生产力的土壤修正案对污染重金属污染的土壤有影响吗？

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摘要

This study presents an analysis of the effects of manure and lime commonly used to improve agricultural productivity and evaluates the potential for such soil amendments to mobilise/immobilise metal fractions in soils contaminated from nearby mine tailings in the Zambian Copperbelt. Lime and manure were applied at the onset of the study, and their effects were studied over two planting seasons, i.e. 2016-17 and 2017–18. Operationally defined plant-available Cd, Cu, Ni, Pb and Zn in the soil, were determined by extraction with DTPA-TEA (diethylenetriaminepentaacetic acid-triethanolamine) and 0.01 M Ca(NO3)2, before, and after, applying the amendments. In unamended soils, Cd was the most available and Ni the least. Lime application decreased extractable Cd, Cu, Ni, Pb and Zn. The response to lime was greater in soils with an initially acidic pH than in those with approximately neutral pH values. Manure increased DTPA extractable Zn, but decreased DTPA and Ca(NO3)2 extractable Cd, Cu and Pb. Combined lime and manure amendment exhibited a greater reduction in DTPA extractable Cd, Ni, Pb, Zn, as well as for Ca(NO3)2 extractable Cd compared to separate applications of lime and manure. The amendments had a significant residual effect on most of the soil fractions between season 1 and 2. The results obtained in this study showed that soil amendment with minimal lime and manure whilst benefiting agricultural productivity, may significantly reduce the mobility or plant availability of metals from contaminated agricultural soils. This is important in contaminated, typical tropical soils used for crop production by resource poor communities affected by mining or other industrial activities.
机译：本研究提出了粪肥和石灰常用于改善农业生产力的影响的分析，并评估这些土壤修正案的潜力，以便在ZAMBIAN Copperbelt中污染的土壤中污染的土壤中的土壤中的污染。在研究开始时施用石灰和粪肥，它们的效果是在两个种植季节中进行的，即2016-17和2017-18。通过用DTPA-TEA（二亚乙基三胺酰胺酸 - 三乙醇胺）和0.01M Ca（NO 3）2，施用修正，通过用DTPA-TEA（二亚乙基三胺酰胺酸 - 三乙醇胺）和0.01M（NO 3）2来测定土壤中的可操作植物可用的CD，Cu，Ni，Pb和Zn。在未达成的土壤中，CD最少，最少。石灰施用减少可提取的CD，Cu，Ni，Pb和Zn。在具有初始酸性pH的土壤中，对石灰的反应比在大致中性pH值近似的那些中更大。粪肥增加DTPA可提取的Zn，但下降DTPA和Ca（NO 3）2可提取的CD，Cu和Pb。结合的石灰和粪肥修正案在DTPA可提取的CD，Ni，Pb，Zn中表现出更大的减少，以及与石灰和粪肥的单独应用相比，CA（NO3）2可提取的CD。该修正案对季节1和2之间的大部分土壤部分具有显着的残余效果。本研究中获得的结果表明，在受益于农业生产力的情况下，具有最小石灰和粪肥的土壤修正案可能会显着降低金属的移动性或植物可用性受污染的农业土壤。这在受矿业或其他工业活动影响的资源贫困社区的污染典型的热带土壤中是重要的。

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