Nitrogen Removal via Denitrification in Two Small Reservoirs in Central Wisconsin, U.S.A.

IF 0.6 4区环境科学与生态学 Q4 Agricultural and Biological Sciences

American Midland Naturalist Pub Date : 2020-07-16 DOI:10.1637/0003-0031-184.1.73

Bree L. Richardson, K. Herrman

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引用次数: 1

Abstract

Abstract. Aquatic ecosystems with long hydraulic residence times (e.g., wetlands and reservoirs) can be important nitrogen (N) sinks via denitrification. The objective of this study was to examine denitrification rates of two small reservoirs (Springville and McDill) in central Wisconsin. Sediments, water chemistry, and discharge data were collected once per month between May and September of 2014 to achieve these objectives. Denitrification rates and microbial biomass carbon were not different between Springville and McDill; however, organic matter was significantly higher in McDill. Average denitrification rates were low at both sites, but ranged widely in Springville (0–23.72 mg N m–2 h–1) and less so in McDill (0.32–12.16 23 mg N m–2 h–1). Low denitrification rates in Springville may be the result of several locations being organic matter limited, whereas the McDill site was likely nitrate limited. Results from this study suggest reservoirs in central Wisconsin that are groundwater fed with sandy substrate have the potential to be nitrate sinks, but variation in the landscape (e.g. land use) and within each reservoir is influencing the magnitude of realized denitrification capabilities.

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美国威斯康辛州中部两个小型水库反硝化脱氮研究

摘要水力停留时间长的水生生态系统（如湿地和水库）可以通过反硝化作用成为重要的氮汇。本研究的目的是检测威斯康星州中部两个小型水库（斯普林维尔和麦克迪尔）的脱氮率。为了实现这些目标，在2014年5月至9月期间每月收集一次沉积物、水化学和排放数据。Springville和McDill的反硝化率和微生物生物量碳没有差异；然而，麦克迪尔的有机质含量明显较高。两个地点的平均脱氮率都很低，但斯普林维尔的脱氮率范围很广（0–23.72 mg N m–2 h–1），而麦克迪尔的脱氮效率则较低（0.32–12.16 23 mg N m-2 h–2）。斯普林维尔的低脱氮率可能是由于几个地区的有机物有限，而麦克迪尔地区的硝酸盐可能有限。这项研究的结果表明，威斯康星州中部以沙质基质为地下水补给的水库有可能成为硝酸盐汇，但景观（如土地利用）和每个水库内部的变化正在影响实现的反硝化能力的大小。

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来源期刊

American Midland Naturalist 环境科学-生态学

CiteScore

1.20

自引率

0.00%

发文量

审稿时长

18-36 weeks

期刊介绍： The American Midland Naturalist has been published for 90 years by the University of Notre Dame. The connotations of Midland and Naturalist have broadened and its geographic coverage now includes North America with occasional articles from other continents. The old image of naturalist has changed and the journal publishes what Charles Elton aptly termed "scientific natural history" including field and experimental biology. Its significance and breadth of coverage are evident in that the American Midland Naturalist is among the most frequently cited journals in publications on ecology, mammalogy, herpetology, ornithology, ichthyology, parasitology, aquatic and invertebrate biology and other biological disciplines.