气候变化领域集成服务门户(CCPortal): Large nitrogen oxide emission pulses from desert soils and associated microbiomes

CCPortal

DOI	10.1007/s10533-020-00672-9
	Large nitrogen oxide emission pulses from desert soils and associated microbiomes
	Eberwein J.R.; Homyak P.M.; Carey C.J.; Aronson E.L.; Jenerette G.D.
发表日期	2020
ISSN	0168-2563
起始页码	239
结束页码	250
卷号	149 期号:3
英文摘要	Nitrogen (N) trace gas emission pulses produced after wetting dry soils may be important pathways of ecosystem N loss. However, the rates and mechanisms controlling these emissions remain unclear. We tested whether changes in microbial community structure and increased rates of atmospheric N deposition could explain N emissions at two desert sites differing in atmospheric N deposition by ~ six fold. We measured peak NOx (sum of nitric oxide and nitrogen dioxide) emissions 12 h post-wetting. NOx emissions remained elevated over 24 h and increased after adding N. In contrast, we measured the highest nitrous oxide (N2O) emissions within only 15 min post-wetting. N2O emissions decreased within 12 h, were insensitive to adding N, and were among the highest reported globally. Microbial communities at the high N deposition site were less diverse with higher 16S nitrifier and bacterial amoA gene abundances relative to the low N deposition site, suggesting an increased capacity for nitrification. Nevertheless, N emissions were lower at the high N deposition site. While microbial communities changed after wetting, these changes were not correlated with N emissions. We conclude that desert soils can produce substantial NOx and N2O emission pulses, but that these emissions do not appear directly governed by changing microbial community characteristics or higher atmospheric N inputs. These findings highlight the importance of gaseous N loss pathways from dryland ecosystems that may contribute to sustained N limitation, with implications for atmospheric chemistry and Earth’s climate. © 2020, Springer Nature Switzerland AG.
英文关键词	Drying-rewetting; N2O; Nitric oxide; Nitrogen deposition; Nitrous oxide; NOx
语种	英语
scopus关键词	atmospheric deposition; community structure; desert soil; ecosystem dynamics; microbial community; microorganism; nitrogen oxides; soil emission; trace gas; Bacteria (microorganisms)
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153127
作者单位	Botany and Plant Sciences, University of California, Riverside, CA, United States; Environmental Sciences, University of California, Riverside, CA, United States; Point Blue Conservation Science, Petaluma, CA, United States; Microbiology and Plant Pathology, University of California, Riverside, CA, United States
推荐引用方式 GB/T 7714	Eberwein J.R.,Homyak P.M.,Carey C.J.,et al. Large nitrogen oxide emission pulses from desert soils and associated microbiomes[J],2020,149(3).
APA	Eberwein J.R.,Homyak P.M.,Carey C.J.,Aronson E.L.,&Jenerette G.D..(2020).Large nitrogen oxide emission pulses from desert soils and associated microbiomes.Biogeochemistry,149(3).
MLA	Eberwein J.R.,et al."Large nitrogen oxide emission pulses from desert soils and associated microbiomes".Biogeochemistry 149.3(2020).