回收废物以减轻植物中的微量元素污染:污染土壤中城市农业的新前景

IF 2.1 Q3 SOIL SCIENCE
Anne Barbillon, T. Lerch, J. Araujo, N. Manouchehri, H. Robain, A. Pando-Bahuon, P. Cambier, François Nold, S. Besançon, C. Aubry
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引用次数: 0

摘要

城市农业发展往往面临土壤污染问题。土壤工程是一种很有前途的解决方案,它包括在被污染的土壤上添加一层由回收废物制成的表层。本研究与城市农民共同构建,旨在实地测试在有机和无机废弃物组成的基质上种植安全食用蔬菜的可行性,直接覆盖受微量元素(TE)污染的土壤。研究人员测试了两种植物:萝卜和西红柿。试验了3种基质:1)羊粪混合堆肥碎木(SHW);2)生物垃圾堆肥与蘑菇堆肥和苎麻碎木(BMW)混合;3)深挖底土混合绿色废弃物堆肥(EXC)。只有在EXC中生长的萝卜的TE水平低于阈值。在所有其他案例中,镉含量都高于阈值。这一关于TE污染植物的结果与下面污染土壤对SHW和BMW基质的污染是一致的。EXC含有较低的TE含量,表明矿物材料限制了污染土壤向基材覆盖层的转移。我们的结论是,在受污染的土壤上混合添加矿物和有机废物比只添加有机废物更能减轻蔬菜污染。然而,这一结果并不适用于所有的蔬菜。需要更多的研究来评估最佳的候选基质及其适当的厚度,研究其在较长时间内的物理化学演变,并测试更大的蔬菜面板。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Recycling wastes to mitigate trace elements contamination in plants: a new horizon for urban agriculture in polluted soils
Urban agriculture development often faces the problem of soil pollution. Soil engineering consisting in the addition over polluted soils of a top layer made of recycled wastes is a promising solution. This study was co-constructed with urban farmers and aimed at testing in situ the feasibility of growing vegetables safe for consumption in substrates consisting of organic and inorganic waste, directly overlaying soil polluted by trace elements (TE). Two plants were tested: radishes and tomatoes. Three substrates were tested: 1) sheep manure mixed with composted ramial chipped wood (SHW); 2) biowaste compost mixed with mushroom compost and ramial chipped wood (BMW); and 3) deep excavated subsoils mixed with green waste compost (EXC). Only radishes grown in EXC presented levels of TE below the threshold values. For all the other cases, cadmium levels were above the threshold values. This result concerning plant contamination by TE is consistent with a contamination of SHW and BMW substrates by the polluted soil underneath. EXC contained lower TE content, suggesting that mineral materials limited the transfer from the polluted soil towards the substrate overlay. We concluded that adding a combination of mineral and organic waste on top of polluted soils may better mitigate vegetables contamination than adding only organic waste. However, this result was not observed for all tested vegetables. More research is needed to evaluate the best substrate candidate and its adequate thickness, to study its physico-chemical evolution over a longer period of time and to test a larger panel of vegetables.
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