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首页> 外文期刊>The Science of the Total Environment >Reducing water use by alternate-furrow irrigation with livestock wastewater reduces antibiotic resistance gene abundance in the rhizosphere but not in the non-rhizosphere
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Reducing water use by alternate-furrow irrigation with livestock wastewater reduces antibiotic resistance gene abundance in the rhizosphere but not in the non-rhizosphere

机译：通过牲畜废水减少猪沟灌溉的用水可降低根际的抗生素抗性基因丰富，但不在非根际

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摘要

Livestock wastewater is rich in nutrients but may contain antibiotics and antibiotic resistance genes (ARGs). Their discharge to watercourses or soil may result in proliferation of ARGs. Irrigation with wastewater appears to be the most feasible option of disposing of it. One efficient irrigation technology used in arid regions is alternate-furrow irrigation (AFI) by alternately drying part of the plant roots for a prolonged period to physiologically reduce transpiration without compromising yield. However, the extent to which AFI with wastewater influences the concentration of antibiotics and spread of ARGs in soil is poorly understood. The purpose of this paper is to investigate how AFI using swine wastewater alters antibiotic kinetics and ARGs abundance under different irrigation rates, using pepper as the model plant. We examined three AFI treatments using 50%, 65% and 80% of the amount of water employed in sufficient conventional furrow irrigation. Each treatment had a groundwater irrigation control. The results showed that antibiotic concentrations and relative ARGs abundance in the top 20 cm of soil did not increase with the irrigation amount, although they were higher than those in the groundwater-irrigated soils. The relative ARGs abundance in the soil was modulated by irrigation amount and reducing the irrigation amount in AFI reduced ARGs dispersion only in rhizosphere. When the soil moisture was close to field capacity, ARGs were more abundant in rhizosphere than in non-rhizosphere, possibly because the rhizosphere is rich in microbes and increasing antibiotic concentrations due to an increase in irrigation rate favors antibiotic-resistant microbiome in competing for substrates. These, however, were not mirrored in the relative ARGs abundance in the roots. These results have important implications as it revealed that reducing the input of antibiotics and ARGs into soil with AFI does not necessarily reduce ARGs proliferation. (C) 2018 The Authors. Published by Elsevier B.V.
机译：牲畜废水富含营养，但可能含有抗生素和抗生素抗性基因（Args）。他们对水道或土壤的排放可能导致args的增殖。用废水灌溉似乎是处理它最可行的选择。在干旱区域中使用的一个有效的灌溉技术是交替沟灌（AFI）通过交替地干燥植物根部的部分，以长时间干燥到生理上减少蒸腾而不会损害产量。然而，AFI与废水的程度影响抗生素的浓度和土壤中args的蔓延众所周知。本文的目的是调查AFI如何使用猪废水改变抗生素动力学，并使用辣椒作为模型植物的不同灌溉速率进行丰富。我们使用足够的常规沟灌水中使用的50％，65％和80％的水进行了三种AFI治疗方法。每种治疗都有一种地下水灌溉控制。结果表明，抗生素浓度和相对蛋白在土壤中的浓度和相对args丰度与灌溉量没有增加，尽管它们高于地下水灌溉土壤中的土壤。土壤中的相对args丰富通过灌溉量调节，并降低AFI中的灌溉量，仅在根际中的args分散。当土壤水分接近田间容量时，args在根际比非根际更丰富，可能是因为根际富含微生物，并且由于灌溉率的增加而增加抗生素浓度，抗生素抗性微生物组在竞争中的竞争中。然而，这些在根中的相对args丰富中没有镜像。这些结果具有重要的含义，因为它显示减少抗生素的输入并用AFI进入土壤并不一定会降低args增殖。 （c）2018年作者。由elsevier b.v出版。

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