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首页> 美国卫生研究院文献>other >Potential Efficiency of Riparian Vegetated Buffer Strips in Intercepting Soluble Compounds in the Presence of Subsurface Preferential Flows
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Potential Efficiency of Riparian Vegetated Buffer Strips in Intercepting Soluble Compounds in the Presence of Subsurface Preferential Flows

机译：在地下优先流存在下河岸植被缓冲带拦截可溶性化合物的潜在效率

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摘要

Buffer strips have been widely recognized as to promote infiltration, deposition and sorption of contaminants for protecting surface water against agricultural contamination. However, such strips do not intercept all contaminants, particularly soluble ones. Although preferential flow (PF) has been suggested as one factor among several decreasing the efficiency of buffer strips, the mechanisms involved are not well understood. This project examines buffer strip efficiency at intercepting solutes when subsurface PF occurs. Two soluble sorbed tracers, FD&C Blue #1 and rhodamine WT, were applied on an agricultural sandy loam soil to evaluate the ability of a naturally vegetated buffer strip to intercept soluble contaminants. Rhodamine was applied about 15 m from the creek, while the Blue was applied 15 m to 165 m from the creek. Tracer concentration was measured over a two-year period in both the creek and the buffer strip through soil and water samples. Although the tracers traveled via different pathways, they both quickly moved toward the creek, passing beneath the buffer strip through the soil matrix. Our results demonstrate that the risk of water contamination by soluble contaminants is high in such systems, even when a well-vegetated buffer strip is used. The design of buffer strips should be modified to account for underground bypass, either by using plants that have deep, fine roots that do not favour PF or by adding a filter extending deep underground that can be regularly changed.
机译：缓冲带已被广泛认为可促进污染物的渗透，沉积和吸附，从而保护地表水免受农业污染。但是，这种条带不能拦截所有污染物，特别是可溶污染物。尽管有人提出优先流动（PF）是降低缓冲带效率的几个因素中的一个因素，但是所涉及的机制还没有得到很好的理解。该项目研究了地下PF发生时截取溶质的缓冲带效率。将两种可溶性吸附示踪剂FD＆C Blue＃1和若丹明WT应用于农业沙质壤土上，以评估天然植被缓冲带拦截可溶性污染物的能力。罗丹明距小溪约15 m，而蓝色距小溪约15 m至165 m。在两年的时间内，通过土壤和水样在小河和缓冲带中测量示踪剂浓度。尽管示踪剂通过不同的路径传播，但它们都迅速移向小溪，在缓冲带下方穿过土壤基质。我们的结果表明，即使使用植被茂盛的缓冲带，此类系统中可溶污染物污染水的风险也很高。应修改缓冲带的设计，以解决地下旁路问题，方法是使用植株根部较深，细根不宜使用PF，或添加可定期更换的深层过滤器。

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