气候变化领域集成服务门户(CCPortal): Greenhouse Gas Production and Transport in Desert Soils of the Southwestern United States

CCPortal

DOI	10.1029/2018GB006035
	Greenhouse Gas Production and Transport in Desert Soils of the Southwestern United States
	Oerter E.; Mills J.V.; Maurer G.E.; Lammers L.N.; Amundson R.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	1703
结束页码	1717
卷号	32 期号:11
英文摘要	Deserts comprise a large portion of the Earth's land area, yet their role in the fluxes and cycles of greenhouse gases is poorly known and their likely response to climate change largely unexplored. We report a reconnaissance investigation of the concentrations and fluxes of CO2, CH4, and N2O along two elevation (climate) gradients in the southwestern United States. In-soil concentrations of CO2 increased with elevation (up to 5,000 ppm). Concentrations of CH4 declined with depth in all soils (to less than 1 ppm), but the rates of decrease with depth increased with elevation. In contrast, concentrations and depth trends of N2O varied erratically. Soils were net CO2 sources (0 to >1,500 kg CO2·ha−1·year−1), and net CH4 sinks (0.2 to >3 kg CH4·ha−1·year−1). The small and variable N2O fluxes were inconsistent with the trends in soil N δ15N values, which decreased by 5‰ to 6‰ over about 1,000 m of elevation. The high soil N δ15N values (up to nearly 17‰ at the lowest elevation) indicate that there is a soil N loss mechanism that is highly depleted in 15N, and gaseous losses—either NH3 or N2O/N2—are suspected of driving these values. In summary, there appears to be a strong climate control on both soil CO2 and CH4 concentrations and to a lesser degree on calculated fluxes. The soil N trace gas concentrations indicate that deserts can be either small sources or sinks of N2O and that there may be significant consumption of arid soil N2O. ©2018. American Geophysical Union. All Rights Reserved.
英文关键词	carbon dioxide; deserts; methane; nitrous oxide; soil
语种	英语
scopus关键词	carbon dioxide; carbon flux; carbon sink; climate change; concentration (composition); desert soil; greenhouse gas; methane; nitrous oxide; trace gas; United States
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129773
作者单位	Lawrence Livermore National Laboratory, Livermore, CA, United States; Department of Environmental Science, Policy and Management, University of California, Berkeley, CA, United States
推荐引用方式 GB/T 7714	Oerter E.,Mills J.V.,Maurer G.E.,et al. Greenhouse Gas Production and Transport in Desert Soils of the Southwestern United States[J],2018,32(11).
APA	Oerter E.,Mills J.V.,Maurer G.E.,Lammers L.N.,&Amundson R..(2018).Greenhouse Gas Production and Transport in Desert Soils of the Southwestern United States.Global Biogeochemical Cycles,32(11).
MLA	Oerter E.,et al."Greenhouse Gas Production and Transport in Desert Soils of the Southwestern United States".Global Biogeochemical Cycles 32.11(2018).