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首页> 外文OA文献 >The transfer and fate of Pb from sewage sludge amended soil in a multi-trophic food chain: a comparison with the labile elements Cd and Zn
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The transfer and fate of Pb from sewage sludge amended soil in a multi-trophic food chain: a comparison with the labile elements Cd and Zn

机译：多营养食物链中污水污泥中Pb的转移和结局：与不稳定元素Cd和Zn的比较

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The contamination of agroecosystems due to the presence of trace elements in commonly used agricultural materials is a serious issue. The most contaminated material is usually sewage sludge, and the sustainable use of this material within agriculture is a major concern. This study addresses a key issue in this respect, the fate of trace metals applied to soil in food chains. The work particularly addresses the transfer of Pb, which is an understudied element in this respect, and compares the transfer of Pb with two of the most labile metals, Cd and Zn. The transfer of these elements was determined from sludge-amended soils in a food chain consisting of Indian mustard (Brassica juncea), the mustard aphid (Lipaphis erysimi) and a predatory beetle (Coccinella septempunctata). The soil was amended with sludge at rates of 0, 5, 10 and 20 % (w/w). Results showed that Cd was readily transferred through the food chain until the predator trophic level. Zn was the most readily transferred element in the lower trophic levels, but transfer to aphids was effectively restricted by the plant regulating shoot concentration. Pb had the lowest level of transfer from soil to shoot and exhibited particular retention in the roots. Nevertheless, Pb concentrations were significantly increased by sludge amendment in aphids, and Pb was increasingly transferred to ladybirds as levels increased. The potential for Pb to cause secondary toxicity to organisms in higher trophic levels may have therefore been underestimated.
机译：由于常用农业材料中存在微量元素，对农业生态系统的污染是一个严重的问题。受污染最严重的材料通常是污水污泥，因此在农业中可持续使用该材料是一个主要问题。这项研究解决了这方面的一个关键问题，即痕量金属在食物链中土壤中的命运。这项工作特别解决了铅的转移问题，在这方面，铅是一个未被充分研究的元素，并将铅与最不稳定的两种金属镉和锌进行了比较。这些元素的转移是从食物链（由印度芥菜（芥菜），芥菜蚜虫（Lipaphis erysimi）和掠食性甲虫（Coccinella septempunctata）组成）的食物链中确定的。用0％，5％，10％和20％（w / w）的污泥对土壤进行修正。结果表明，镉很容易通过食物链转移到捕食者的营养水平。 Zn在较低的营养水平下是最容易转移的元素，但是通过调节芽浓度的植物有效地限制了向蚜虫的转移。铅从土壤到芽的转移水平最低，并且在根部表现出特定的保留。然而，由于污泥的改良，铅的浓度显着增加，并且随着铅含量的增加，铅逐渐转移到瓢虫中。因此，人们可能低估了铅在较高营养水平下对生物体造成二次毒性的可能性。

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