气候变化领域集成服务门户(CCPortal): Bedrock weathering contributes to subsurface reactive nitrogen and nitrous oxide emissions

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DOI	10.1038/s41561-021-00717-0
	Bedrock weathering contributes to subsurface reactive nitrogen and nitrous oxide emissions
	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.
发表日期	2021
ISSN	17520894
起始页码	217
结束页码	224
卷号	14 期号:4
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.
英文关键词	bedrock; chemical weathering; global warming; hillslope; leaching; nitrogen cycle; nitrous oxide; pollutant source; seasonality
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206973
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
推荐引用方式 GB/T 7714	Wan J.,Tokunaga T.K.,Brown W.,et al. Bedrock weathering contributes to subsurface reactive nitrogen and nitrous oxide emissions[J],2021,14(4).
APA	Wan J..,Tokunaga T.K..,Brown W..,Newman A.W..,Dong W..,...&Williams K.H..(2021).Bedrock weathering contributes to subsurface reactive nitrogen and nitrous oxide emissions.Nature Geoscience,14(4).
MLA	Wan J.,et al."Bedrock weathering contributes to subsurface reactive nitrogen and nitrous oxide emissions".Nature Geoscience 14.4(2021).