DOI: 10.1038/s41561-021-00717-0
论文题名: Bedrock weathering contributes to subsurface reactive nitrogen and nitrous oxide emissions
作者: Wan J. ; Tokunaga T.K. ; Brown W. ; Newman A.W. ; Dong W. ; Bill M. ; Beutler C.A. ; Henderson A.N. ; Harvey-Costello N. ; Conrad M.E. ; Bouskill N.J. ; Hubbard S.S. ; Williams K.H.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2021
卷: 14, 期: 4 起始页码: 217
结束页码: 224
语种: 英语
英文关键词: bedrock
; chemical weathering
; global warming
; hillslope
; leaching
; nitrogen cycle
; nitrous oxide
; pollutant source
; seasonality
英文摘要: Atmospheric nitrous oxide contributes directly to global warming, yet models of the nitrogen cycle do not account for bedrock, the largest pool of terrestrial nitrogen, as a source of nitrous oxide. Although it is known that release rates of nitrogen from bedrock are large, there is an incomplete understanding of the connection between bedrock-hosted nitrogen and atmospheric nitrous oxide. Here, we quantify nitrogen fluxes and mass balances at a hillslope underlain by marine shale. We found that, at this site, bedrock weathering contributes 78% of the subsurface reactive nitrogen, while atmospheric sources (commonly regarded as the sole sources of reactive nitrogen in pristine environments) account for only the remaining 22%. About 56% of the total subsurface reactive nitrogen denitrifies, including 14% emitted as nitrous oxide. The remaining reactive nitrogen discharges in porewaters to a floodplain where additional denitrification probably occurs. We also found that the release of bedrock nitrogen occurs primarily within the zone of the seasonally fluctuating water table and suggest that the accumulation of nitrate in the vadose zone, often attributed to fertilization and soil leaching, may also include contributions from weathered nitrogen-rich bedrock. Our hillslope study suggests that, under oxygenated and moisture-rich conditions, weathering of deep, nitrogen-rich bedrock makes an important contribution to the nitrogen cycle. © 2021, The Author(s), under exclusive licence to Springer Nature Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169829
Appears in Collections: 气候变化与战略
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作者单位: Earth and Environment Sciences Area, Lawrence Berkeley National Laboratory, Berkeley, CA, United States; Rocky Mountain Biological Laboratory, Crested Butte, CO, United States
Recommended Citation:
Wan J.,Tokunaga T.K.,Brown W.,et al. Bedrock weathering contributes to subsurface reactive nitrogen and nitrous oxide emissions[J]. Nature Geoscience,2021-01-01,14(4)