Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.1820389116 |
Widespread nitrous oxide undersaturation in farm waterbodies creates an unexpected greenhouse gas sink | |
Webb, Jackie R.1; Hayes, Nicole M.1,2; Simpson, Gavin L.1,3; Leavitt, Peter R.1,3,4; Baulch, Helen M.5; Finlay, Kerri1 | |
2019 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2019 |
卷号 | 116期号:20页码:9814-9819 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada; USA; North Ireland |
英文摘要 | Nitrogen pollution and global eutrophication are predicted to increase nitrous oxide (N2O) emissions from freshwater ecosystems. Surface waters within agricultural landscapes experience the full impact of these pressures and can contribute substantially to total landscape N2O emissions. However, N2O measurements to date have focused on flowing waters. Small artificial waterbodies remain greatly understudied in the context of agricultural N2O emissions. This study provides a regional analysis of N2O measurements in small (<0.01 km(2)) artificial reservoirs, of which an estimated 16 million exist globally. We show that 67% of reservoirs were N2O sinks (-12 to -2 mu mol (NO)-O-2.m(-2).d(-1)) in Canada's largest agricultural area, despite their highly eutrophic status [99 +/- 289 mu g.L-1 chlorophyll-a (Chl-a)]. Generalized additive models indicated that in situ N2O concentrations were strongly and nonlinearly related to stratification strength and dissolved inorganic nitrogen content, with the lowest N2O levels under conditions of strong water column stability and high algal biomass. Predicted fluxes from previously published models based on lakes, reservoirs, and agricultural waters overestimated measured fluxes on average by 7- to 33-fold, challenging the widely held view that eutrophic N-enriched waters are sources of N2O. |
英文关键词 | nitrous oxide agriculture farm reservoirs impoundments greenhouse gases |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000467804000026 |
WOS关键词 | ARTIFICIAL WATER BODIES ; FRESH-WATER ; N2O EMISSIONS ; LAKES ; CH4 ; DENITRIFICATION ; RESERVOIRS ; STREAMS ; FLUXES ; SCALE |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/205113 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Univ Regina, Dept Biol, Regina, SK S4S 0A2, Canada; 2.Univ Minnesota, Coll Biol Sci, St Paul, MN 55108 USA; 3.Univ Regina, Inst Environm Change & Soc, Regina, SK S4S 0A2, Canada; 4.Queens Univ Belfast, Inst Global Food Secur, Belfast BT7 1NN, Antrim, North Ireland; 5.Univ Saskatchewan, Global Inst Water Secur, Sch Environm & Sustainabil, Saskatoon, SK S7N 3H5, Canada |
推荐引用方式 GB/T 7714 | Webb, Jackie R.,Hayes, Nicole M.,Simpson, Gavin L.,et al. Widespread nitrous oxide undersaturation in farm waterbodies creates an unexpected greenhouse gas sink[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2019,116(20):9814-9819. |
APA | Webb, Jackie R.,Hayes, Nicole M.,Simpson, Gavin L.,Leavitt, Peter R.,Baulch, Helen M.,&Finlay, Kerri.(2019).Widespread nitrous oxide undersaturation in farm waterbodies creates an unexpected greenhouse gas sink.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,116(20),9814-9819. |
MLA | Webb, Jackie R.,et al."Widespread nitrous oxide undersaturation in farm waterbodies creates an unexpected greenhouse gas sink".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 116.20(2019):9814-9819. |
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