DOI: 10.1029/2018GB006035
论文题名: Greenhouse Gas Production and Transport in Desert Soils of the Southwestern United States
作者: Oerter E. ; Mills J.V. ; Maurer G.E. ; Lammers L.N. ; Amundson R.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2018
卷: 32, 期: 11 语种: 英语
英文关键词: carbon dioxide
; carbon flux
; carbon sink
; climate change
; concentration (composition)
; desert soil
; greenhouse gas
; methane
; nitrous oxide
; trace gas
; United States
学科: carbon dioxide
; deserts
; methane
; nitrous oxide
; soil
中文摘要: 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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160177
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Oerter E.,Mills J.V.,Maurer G.E.,et al. Greenhouse Gas Production and Transport in Desert Soils of the Southwestern United States[J]. Global Biogeochemical Cycles,2018-01-01,32(11)