Urban beaver ponds show limited impact on stream carbon quantity in contrast to stormwater ponds

IF 2.5 3区 环境科学与生态学 Q2 BIODIVERSITY CONSERVATION Urban Ecosystems Pub Date : 2024-03-15 DOI:10.1007/s11252-024-01536-y
Julian Sheppy, Elizabeth B. Sudduth, Sandra Clinton, Diego Riveros-Iregui, Sarah H. Ledford
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Abstract

Urban beaver and stormwater ponds provide hydrologic retention in the landscape while collecting dissolved organic matter (DOM)-rich runoff that can promote primary productivity. Our objective was to determine how the quantity, source, and bioavailability of DOM changed across urban stormwater and beaver pond systems, then compare the two pond types to each other. We measured dissolved organic carbon (DOC) and specific ultraviolet absorbance at 254 nm (SUVA254) from upstream, within, and downstream of seven ponds in Atlanta, GA, USA, biweekly from March to December 2021. Additionally, we completed 28-day laboratory microcosm incubations of pond in- and out-flow during summer and autumn of 2021. We found higher concentrations of DOC in the pond and outflows of stormwater ponds, whereas beaver ponds did not cause any change. Effects of pond type (beaver vs. stormwater) were greater than other controls on concentration, including flow and season. In contrast, SUVA254 showed a shift toward more aromatic carbon below both systems without a clear difference between pond types. Beaver and stormwater pond outflows had similar ranges of DOM bioavailability in summer, but during autumn bioavailability at both sites declined to near zero. Overall, we found that stormwater ponds and beaver ponds had similar impacts on aromaticity and bioavailability, however stormwater ponds increased the quantity of DOC while beaver ponds did not. This suggests that in addition to increasing hydrologic residence times in urbanized systems, urban beaver ponds may limit the export of bioavailable carbon and reduce microbial processing downstream.

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与雨水池塘相比,城市海狸池塘对溪流碳量的影响有限
城市海狸池塘和雨水池塘在景观中提供水文滞留,同时收集富含溶解有机物(DOM)的径流,从而促进初级生产力。我们的目标是确定 DOM 的数量、来源和生物利用率在城市雨水和海狸池塘系统中的变化情况,然后将这两种池塘类型进行比较。从 2021 年 3 月到 12 月,我们每两周测量一次美国佐治亚州亚特兰大市七个池塘上游、内部和下游的溶解有机碳 (DOC) 和 254 纳米波长的特定紫外线吸收率 (SUVA254)。此外,我们还在 2021 年夏季和秋季完成了为期 28 天的池塘内外流实验室微生态系统培养。我们发现,雨水池塘的池塘和外流的 DOC 浓度较高,而海狸池塘没有引起任何变化。池塘类型(海狸塘与雨水塘)对浓度的影响大于其他控制因素,包括流量和季节。与此相反,SUVA254 在两个系统下都显示出芳香碳的增加,而池塘类型之间没有明显差异。海狸池和雨水池塘流出的 DOM 生物可利用度在夏季的范围相似,但在秋季,两个地点的生物可利用度都下降到接近于零。总体而言,我们发现雨水池塘和海狸池塘对芳香度和生物利用率的影响相似,但雨水池塘增加了 DOC 的数量,而海狸池塘则没有。这表明,除了增加城市化系统中的水文停留时间外,城市海狸塘还可能限制生物可用碳的输出,减少下游微生物的处理。
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来源期刊
Urban Ecosystems
Urban Ecosystems BIODIVERSITY CONSERVATION-ECOLOGY
CiteScore
5.70
自引率
6.90%
发文量
113
期刊介绍: Urban Ecosystems is an international journal devoted to scientific investigations of urban environments and the relationships between socioeconomic and ecological structures and processes in urban environments. The scope of the journal is broad, including interactions between urban ecosystems and associated suburban and rural environments. Contributions may span a range of specific subject areas as they may apply to urban environments: biodiversity, biogeochemistry, conservation biology, wildlife and fisheries management, ecosystem ecology, ecosystem services, environmental chemistry, hydrology, landscape architecture, meteorology and climate, policy, population biology, social and human ecology, soil science, and urban planning.
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