DOI: 10.1007/s10533-013-9927-0
Scopus记录号: 2-s2.0-84907547768
论文题名: Physical and biological controls on trace gas fluxes in semi-arid urban ephemeral waterways
作者: Gallo E.L. ; Lohse K.A. ; Ferlin C.M. ; Meixner T. ; Brooks P.D.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 121, 期: 1 起始页码: 189
结束页码: 207
语种: 英语
英文关键词: Carbon
; Methane
; Nitrogen
; Semi-arid
; Trace gas flux
; Urban stream
Scopus关键词: biological control
; carbon cycle
; ephemeral pool
; methane
; nitrogen cycle
; semiarid region
; trace gas
; waterway transport
; Arizona
; Tucson
; United States
英文摘要: Rapid increases in human population and land transformation in arid and semi-arid regions are altering water, carbon (C) and nitrogen (N) cycles, yet little is known about how urban ephemeral stream channels in these regions affect biogeochemistry and trace gas fluxes. To address these knowledge gaps, we measured carbon dioxide (CO2 ), nitrous oxide (N2 O), and methane (CH4 ) before and after soil wetting in 16 ephemeral stream channels that vary in soil texture and organic matter in Tucson, AZ. Fluxes of CO2 and N2 O immediately following wetting were among the highest ever published (up to 1,588 mg C m−2 h−1 and 3,121 μg N m−2 h−1). Mean post-wetting CO2 and N2 O fluxes were significantly higher in the loam and sandy loam channels (286 and 194 mg C m−2 h−1; 168 and 187 μg N m−2 h−1) than in the sand channels (45 mg C m−2 h−1 and 7 μg N m−2 h−1). Factor analyses show that the effect of soil moisture, soil C and soil N on trace gas fluxes varied with soil texture. In the coarser sandy sites, trace gas fluxes were primarily controlled by soil moisture via physical displacement of soil gases and by organic soil C and N limitations on biotic processes. In the finer sandy loam sites trace gas fluxes and N-processing were primarily limited by soil moisture, soil organic C and soil N resources. In the loam sites, finer soil texture and higher soil organic C and N enhance soil moisture retention allowing for more biologically favorable antecedent conditions. Variable redox states appeared to develop in the finer textured soils resulting in wide ranging trace gas flux rates following wetting. These findings indicate that urban ephemeral channels are biogeochemical hotspots that can have a profound impact on urban C and N biogeochemical cycling pathways and subsequently alter the quality of localized water resources. © 2013, Springer Science+Business Media Dordrecht. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83580
Appears in Collections: 气候减缓与适应 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Hydrology and Water Resources, University of Arizona, Tucson, AZ, United States; School of Natural Resources and the Environment, University of Arizona, Tucson, AZ, United States; Department of Biological Sciences, Idaho State University, Pocatello, ID, United States; Department of Soil, Water and Environmental Science, University of Arizona, Tucson, AZ, United States
Recommended Citation:
Gallo E.L.,Lohse K.A.,Ferlin C.M.,et al. Physical and biological controls on trace gas fluxes in semi-arid urban ephemeral waterways[J]. Biogeochemistry,2014-01-01,121(1)