DOI: 10.1007/s10533-014-9995-9
Scopus记录号: 2-s2.0-84904813557
论文题名: Influence of bioturbation on denitrification and dissimilatory nitrate reduction to ammonium (DNRA) in freshwater sediments
作者: Nogaro G. ; Burgin A.J.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 120, 期: 2018-01-03 起始页码: 279
结束页码: 294
语种: 英语
英文关键词: Eutrophication
; Isotope pairing technique
; Lake sediment
; Nitrate ammonification
; Nitrogen cycle
; Tubificid oligochaete
Scopus关键词: algae
; Invertebrata
; Oligochaeta (Metazoa)
; Tubificidae
英文摘要: Intensive agriculture leads to increased nitrogen fluxes (mostly as nitrate, NO3 -) to aquatic ecosystems, which in turn creates ecological problems, including eutrophication and associated harmful algal blooms. These problems have focused scientific attention on understanding the controls on nitrate reduction processes such as denitrification and dissimilatory nitrate reduction to ammonium (DNRA). Our objective was to determine the effects of nutrient-tolerant bioturbating invertebrates (tubificid oligochaetes) on nitrogen cycling processes, specifically coupled nitrification-denitrification, net denitrification, DNRA, and biogeochemical fluxes (O2, NO3 -, NH4 +, CO2, N2O, and CH4) in freshwater sediments. A mesocosm experiment determined how tubificid density and increasing NO3 - concentrations (using N15 isotope tracing) interact to affect N cycling processes. At the lowest NO3 - concentration and in the absence of bioturbation, the relative importance of denitrification to DNRA was similar (i.e., 49.6 and 50.4 ± 8.1 %, respectively). Increasing NO3 - concentrations in the control cores (without fauna) stimulated denitrification, but did not enhance DNRA, which significantly altered the relative importance of denitrification compared to DNRA (94.6 vs. 5.4 ± 0.9 %, respectively). The presence of tubificid oligochaetes enhanced O2, NO3 -, NH4 + fluxes, greenhouse gas production, and N cycling processes. The relative importance of denitrification to DNRA shifted towards favoring denitrification with both the increase in NO3 - concentrations and the increase of bioturbation activity. Our study highlights that understanding the interactions between nutrient-tolerant bioturbating species and nitrate contamination is important for determining the nitrogen removal capacity of eutrophic freshwater ecosystems. © 2014 Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83702
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Earth and Environmental Sciences, Wright State University, 3640 Colonel Glenn Highway, Dayton, OH, 45435, United States; Annis Water Ressources Institute, Grand Valley State University, 740 West Shoreline Dr, Muskegon, MI, 49441, United States; School of Natural Resources, University of Nebraska, 412 Hardin Hall, 3310 Holdrege Ave, Lincoln, NE, 68583, United States
Recommended Citation:
Nogaro G.,Burgin A.J.. Influence of bioturbation on denitrification and dissimilatory nitrate reduction to ammonium (DNRA) in freshwater sediments[J]. Biogeochemistry,2014-01-01,120(2018-01-03)