Coupled Effects of Pore Water Velocity and Soil Heterogeneity on Bacterial Transport: Intact vs. Repacked Soils.
Coupled Effects of Pore Water Velocity and Soil Heterogeneity on Bacterial Transport: Intact vs. Repacked Soils.
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孔隙水速度和土壤异质性对细菌迁移的耦合影响：完整与重新填充的土壤。
DOI：
10.3389/fmicb.2022.730075
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发表时间：
2022
影响因子：
5.2
通讯作者：
Zhuang J
中科院分区：
文献类型：
--
作者：
Chen J;Yang L;Chen X;Ripp S;Zhuang J
病原菌从地表向地下水的迁移受降雨强度、不同深度地下沉积物的地球化学和结构非均匀性的影响。人们假设降雨强度的变化对细菌迁移具有不同的影响，这是土壤深度的函数。在这项研究中，重新包装和完整的柱系统被用来调查的影响，孔隙水流速的大肠杆菌652 T7通过壤土从不同的土壤深度收集的运输。土壤的地球化学性质和土壤结构不同。采用平板计数法测定土壤和液体样品中细菌的浓度。E. coli 652 T7在原状土和扰动土中均随孔隙水流速的增加而增加。在不同的土壤深度，最大的速度效应观察到通过表层土壤（0-5厘米）的扰动和完整的土壤剖面的传输。这种孔隙水流速的深度依赖性效应归因于土壤有机质（SOM）和氧化铁含量随深度的下降梯度，因为SOM和氧化铁有利于细菌附着在土壤表面。在相同深度下，扰动土中的细菌数量少于原状土，且扰动土的孔隙水流速效应强于原状土。具体地，最大C/C 0（即，流出物与流入物浓度的比率）加倍（即，从0.36到0.76）在0- 5cm完整土柱中并且增加三倍（即，0- 5cm重新填充土柱中的含量为0.16至0.43）。这种结构依赖性的孔隙水速度的影响是由于较大的孔隙弯曲度和较窄的范围内的孔隙尺寸在扰动土壤比在完整的土壤。这些研究结果表明，孔隙水流速的变化可能会引发细菌的再动员，特别是在表层土壤中，相对于深层土壤，更多的细菌被保留。不同结构性土中孔隙水速度效应的深度剖面。
Transport of pathogenic bacteria from land surface to groundwater is largely influenced by rainfall intensity and geochemical and structural heterogeneities of subsurface sediments at different depths. It has been assumed that the change in rainfall intensity has different effects on bacterial transport as a function of soil depth. In this study, repacked and intact column systems were used to investigate the influences of pore water velocity on the transport of Escherichia coli 652T7 through a loamy soil collected from varying soil depths. The soils differed in geochemical properties and soil structures. The concentrations of bacteria in soil and liquid samples were measured using plate counting method. The breakthrough percentages of E. coli 652T7 increased with pore water velocity at each depth in both intact and disturbed soils. Among the different soil depths, the largest velocity effect was observed for the transport through the top soil (0–5 cm) of both disturbed and intact soil profiles. This depth-dependent effect of pore water velocity was attributed to down gradients of soil organic matter (SOM) and iron oxide contents with depth because SOM and iron oxides were favorable for bacterial attachment on soil surfaces. In addition, less bacteria broke through the disturbed soil than through the intact soil at the same depth, and the pore water velocity effect was stronger with the disturbed than intact soils. Specifically, the maximum C/C0 (i.e., ratio of effluent to influent concentration) doubled (i.e., from 0.36 to 0.76) in the 0–5 cm intact soil columns and tripled (i.e., from 0.16 to 0.43) in the 0–5 cm repacked soil columns. This structure-dependent effect of pore water velocity was attributed to larger pore tortuosity and a narrower range of pore sizes in the disturbed soil than in the intact soil. These findings suggest that change in pore water velocity could trigger bacterial remobilization especially in surface soils, where more bacteria are retained relative to deep soils. Depth profile of pore water velocity effect in differently structured soils.
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