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Soil type influences the leaching of microbial indicators under natural rainfall following application of dairy shed effluent

机译：施用奶牛棚废水后，土壤类型影响自然降雨下微生物指标的淋洗

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The ability of soil to function as a barrier between microbial pathogens in wastes and groundwater following application of animal wastes is dependent on soil structure. We irrigated soil lysimeters with dairy shed effluent at intervals of 3-4 months and monitored microbial indicators (somatic coliphage, faecal enterococci, Escherichia coli) in soil core leachates for 1 year. The lysimeters were maintained in a lysimeter facility under natural soil temperature and moisture regimes. Microbial indicators were rapidly transported to depth in well-structured Netherton clay loam soil. Peak concentrations of E. coli and somatic coliphage were detected immediately following dairy shed effluent application to Netherton clay loam soil, and E. coli continued to leach from the soil following rainfall. In contrast, microbial indicators were rarely detected in leachates from fine-structured Manawatu sandy loam soil. Potential for leaching was dependent on soil moisture conditions in Manawatu soil but not Netherton soil, where leaching occurred regardless. Dye studies confirmed that E. coli can be transported to depth by flow through continuous macropores in Netherton soils. However, in the main E. coli was retained in topsoil of Netherton and Manawatu soil.
机译：施用动物废物后，土壤在废物中的微生物病原体和地下水之间起屏障作用的能力取决于土壤结构。我们每隔3-4个月用乳汁污水灌溉土壤渗漏仪，并监测土壤核心渗滤液中的微生物指标（体细胞噬菌体，粪便肠球菌，大肠杆菌），为期1年。将测渗仪保持在溶媒仪中在自然土壤温度和湿度条件下。微生物指标在结构良好的Netherton粘土壤土中迅速转运至深度。在Netherton黏土壤土上施用乳制品棚废水后，立即检测到大肠杆菌和体细胞噬菌体的峰值浓度，降雨后大肠杆菌继续从土壤中浸出。相反，在微细结构的Manawatu砂质壤土中的渗滤液中很少检测到微生物指标。浸出的潜力取决于马纳瓦图土壤中的土壤水分条件，而不取决于Netherton土壤，无论在那里发生浸出。染料研究证实，大肠杆菌可以通过流经Netherton土壤中的连续大孔而深入运输。但是，大肠杆菌主要保留在Netherton和Manawatu土壤的表层土壤中。

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