Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/s10533-013-9927-0 |
Physical and biological controls on trace gas fluxes in semi-arid urban ephemeral waterways | |
Gallo, Erika L.1; Lohse, Kathleen A.2; Ferlin, Christopher M.3; Meixner, Thomas1; Brooks, Paul D.1 | |
通讯作者 | Gallo, Erika L. |
来源期刊 | BIOGEOCHEMISTRY
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ISSN | 0168-2563 |
EISSN | 1573-515X |
出版年 | 2014 |
卷号 | 121期号:1页码:189-207 |
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 (N2O), 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 N2O immediately following wetting were among the highest ever published (up to 1,588 mg C m(-2) h(-1) and 3,121 mu g N m(-2) h(-1)). Mean post-wetting CO2 and N2O fluxes were significantly higher in the loam and sandy loam channels (286 and 194 mg C m(-2) h(-1); 168 and 187 mu g N m(-2) h(-1)) than in the sand channels (45 mg C m(-2) h(-1) and 7 mu g 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. |
英文关键词 | Urban stream Trace gas flux Semi-arid Nitrogen Carbon Methane |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000341908600010 |
WOS关键词 | NITROUS-OXIDE FLUXES ; PRECIPITATION PULSES ; SOIL RESPIRATION ; SONORAN DESERT ; BIOGEOCHEMICAL CYCLES ; CARBON ; METHANE ; DENITRIFICATION ; RESPONSES ; URBANIZATION |
WOS类目 | Environmental Sciences ; Geosciences, Multidisciplinary |
WOS研究方向 | Environmental Sciences & Ecology ; Geology |
来源机构 | University of Arizona |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/181056 |
作者单位 | 1.Univ Arizona, Dept Hydrol & Water Resources, Tucson, AZ 85721 USA; 2.Univ Arizona, Sch Nat Resources & Environm, Tucson, AZ 85721 USA; 3.Univ Arizona, Dept Soil Water & Environm Sci, Tucson, AZ 85721 USA |
推荐引用方式 GB/T 7714 | Gallo, Erika L.,Lohse, Kathleen A.,Ferlin, Christopher M.,et al. Physical and biological controls on trace gas fluxes in semi-arid urban ephemeral waterways[J]. University of Arizona,2014,121(1):189-207. |
APA | Gallo, Erika L.,Lohse, Kathleen A.,Ferlin, Christopher M.,Meixner, Thomas,&Brooks, Paul D..(2014).Physical and biological controls on trace gas fluxes in semi-arid urban ephemeral waterways.BIOGEOCHEMISTRY,121(1),189-207. |
MLA | Gallo, Erika L.,et al."Physical and biological controls on trace gas fluxes in semi-arid urban ephemeral waterways".BIOGEOCHEMISTRY 121.1(2014):189-207. |
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