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Potential for saturated riparian buffers to treat tile drainage among 32 watersheds representing Iowa landscapes
Journal of Soil and Water Conservation ( IF 3.9 ) Pub Date : 2020-01-01 , DOI: 10.2489/jswc.2020.00129
M.D. Tomer , S.A. Porter , D.E. James , J.D. Van Horn

The saturated riparian buffer (SRB) is a new and cost-effective conservation practice that diverts agricultural tile drainage toward subsurface discharge within riparian buffers to achieve nitrate (NO3-N) removal. Conservation planners want to understand the potential role of the SRB practice for reducing NO3-N loads from tile-drained agricultural watersheds. The Agricultural Conservation Planning Framework (ACPF) includes a tool for identifying riparian zones where the SRB practice can be installed with minimal risks of unintended consequences (i.e., crop inundation and streambank failure). Watershed assessment of the potential role for SRBs, however, must identify where SRB-suited sites can actually receive drainage from tile-drained fields. This study compared the extent of SRB-suited riparian sites among 32 Iowa watersheds, and estimated the proportion of each watershed that was tile drained and located above SRB-suited riparian zones. Results showed the extent of sites suited for SRBs did not significantly differ among three Major Land Resource Areas (MLRAs) in Iowa, from which the selected watersheds were randomly chosen. Most watersheds had suitable sites along 30% to 70% of streambank lengths, where tile drainage from 15% to 40% of the watershed areas could be diverted, based on estimated extents of tile drainage above suitable sites. Therefore, the SRB has an important potential role for water quality improvement in many tile-drained watersheds in Iowa. However, the SRB practice is not readily designed for treating drainage from headwater catchments, which frequently comprised more than 30% of watershed areas in headwater streams of north central Iowa (MLRA 103), where tile drainage is extensive.

中文翻译:

饱和河岸缓冲区在代表爱荷华州景观的 32 个流域中处理瓷砖排水的潜力

饱和河岸缓冲区 (SRB) 是一种新的、具有成本效益的保护措施,可将农业瓷砖排水转向河岸缓冲区内的地下排放,以实现硝酸盐 (NO3-N) 的去除。保护规划者希望了解 SRB 实践在减少来自瓦片排水农业流域的 NO3-N 负荷方面的潜在作用。农业保护规划框架 (ACPF) 包括一个工具,用于确定可以安装 SRB 实践的河岸带,同时将意外后果(即作物淹没和河床倒塌)的风险降至最低。然而,对 SRB 潜在作用的流域评估必须确定适合 SRB 的地点实际上可以从瓷砖排水田接收排水。本研究比较了爱荷华州 32 个流域中适合 SRB 的河岸地点的范围,并估计了每个流域的比例,这些流域被排干并位于适合 SRB 的河岸带上方。结果显示,在爱荷华州的三个主要土地资源区 (MLRA) 中,适合 SRB 的地点范围没有显着差异,其中选定的流域是随机选择的。大多数流域在 30% 到 70% 的河岸长度上都有合适的地点,根据合适地点上方瓦片排水的估计范围,其中 15% 到 40% 的流域区域的瓦片排水可以被分流。因此,SRB 在爱荷华州许多瓦片排水流域的水质改善方面具有重要的潜在作用。然而,SRB 实践并不容易设计用于处理源头集水区的排水,
更新日期:2020-01-01
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