Hyporheic exchange in an urban beaver pond mediates high nutrient groundwater inflow and pond productivity
Hyporheic exchange in an urban beaver pond mediates high nutrient groundwater inflow and pond productivity
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城市海狸池塘的地下交换调节高营养地下水流入和池塘生产力
DOI：
10.1016/j.jhydrol.2023.129758
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发表时间：
2023
影响因子：
6.4
通讯作者：
Sudduth, Elizabeth
中科院分区：
文献类型：
--
作者：
Ledford, Sarah H.;Miller, Shellby;Pangle, Luke;Sudduth, Elizabeth
海狸种群在北美的反弹导致了对它们如何改变河道影响水文和地球化学循环的新认识，但它们对城市地区的影响尚未得到很好的研究。城市海狸池塘有可能减缓和保留径流，重新连接周围的洪泛区，并减少营养物质。在管理允许的情况下，海狸池塘可以部分改善城市河流的水质问题，并提高更广泛的河岸带的生态功能。在这项研究中，我们测量了水化学在表面（超过十个月）和hyporheic（超过三个月）沃茨，包括硝酸盐，铵，和溶解有机碳（DOC），以评估城市海狸水坝对水质的影响。池塘水来自地下水，池塘顶部的地表水处于缺氧状态，在池塘中纵向移动时变得越来越好氧。大的昼夜溶解氧波动在池塘中表明高sestonic生产力。在大坝上方和下方以及整个大坝上有明显的潜流地球化学特征，表明大坝正在推动大坝上方的下降流和下方的上升流。潜流铵浓度和表面硝酸盐浓度高以上的大坝和大坝以下的减少，表明移动好氧条件驱动氮的形态。硝酸盐的δ 15 N和δ 18 O值表明，扩散污水泄漏作为营养物质的主要来源，而不是陆上径流的池塘。此外，表层沃茨中硝酸盐和DOC的δ 15 N和δ 18 O含量低于地下沃茨，表明反硝化作用可能是硝酸盐含量降低的驱动力。随着海狸在城市河流中的存在越来越多，通过城市海狸坝的地表水-地下水相互作用有可能从池塘中修复城市营养源。
The rebound of beaver populations across North America has resulted in new understanding of how their alteration of stream channels affects hydrology and biogeochemical cycling, but their increased impact on urban areas has not been well investigated. Urban beaver ponds have the potential to slow and retain runoff, reconnect surrounding floodplains, and reduce nutrients. Where management allows, beaver ponds may partially ameliorate water quality problems in urban streams and enhance the ecological function of the broader riparian zone. In this study we measured water chemistry in surface (over ten months) and hyporheic (over three months) waters, including nitrate, ammonium, and dissolved organic carbon (DOC), to assess the impact of urban beaver dams on water quality. Pond water is sourced from groundwater, with anoxic conditions in the surface water at the top of the pond that become increasingly oxic moving longitudinally through the pond. Large diel dissolved oxygen swings in the pond indicate high sestonic productivity. There are distinct hyporheic geochemical signatures above and below the dam as well as across the dam indicating the dam is driving downwelling above the dam and upwelling below. Hyporheic ammonium concentrations and surface nitrate concentrations are high above the dam and decrease below the dam, showing that shifting oxic conditions drive nitrogen speciation. The δ15N and δ18O values of nitrate point to diffuse sewage leaks as the main source of nutrients to the pond instead of overland runoff. In addition, surface waters have lower δ15N and δ18O of nitrate and DOC concentrations than groundwaters, indicating denitrification may drive the decrease in nitrate concentration. With increasing presence of beaver in urban streams, surface water-groundwater interactions through urban beaver dams have the potential to remediate urban sources of nutrients from ponds.
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影响因子：
5.9
作者：
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DOI：
--
发表时间：
1990
期刊：
影响因子：
--
作者：
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DOI：
--
发表时间：
2007
期刊：
影响因子：
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