DOI: 10.1007/s10533-015-0133-0
Scopus记录号: 2-s2.0-84944168282
论文题名: Proximate controls on semiarid soil greenhouse gas fluxes across 3 million years of soil development
作者: Sullivan B.W. ; Nasto M.K. ; Hart S.C. ; Hungate B.A.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 125, 期: 3 起始页码: 375
结束页码: 391
语种: 英语
英文关键词: Carbon dioxide
; Methane
; Nitrous oxide
; Nutrient addition
; Seasonality
; Substrate age gradient
Scopus关键词: denitrification
; greenhouse gas
; humid environment
; nitrification
; nutrient availability
; nutrient uptake
; regression analysis
; seasonal variation
; semiarid region
; soil fertility
; soil nitrogen
; temperature effect
; water availability
; Arizona
; United States
英文摘要: Soils are important sources and sinks of three greenhouse gases (GHGs): carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O). However, it is unknown whether semiarid landscapes are important contributors to global fluxes of these gases, partly because our mechanistic understanding of soil GHG fluxes is largely derived from more humid ecosystems. We designed this study with the objective of identifying the important soil physical and biogeochemical controls on soil GHG fluxes in semiarid soils by observing seasonal changes in soil GHG fluxes across a three million year substrate age gradient in northern Arizona. We also manipulated soil nitrogen (N) and phosphorus availability with 7 years of fertilization and used regression tree analysis to identify drivers of unfertilized and fertilized soil GHG fluxes. Similar to humid ecosystems, soil N2O flux was correlated with changes in N and water availability and soil CO2 efflux was correlated with changes in water availability and temperature. Soil CH4 uptake was greatest in relatively colder and wetter soils. While fertilization had few direct effects on soil CH4 flux, soil nitrate was an important predictor of soil CH4 uptake in unfertilized soils and soil ammonium was an important predictor of soil CH4 uptake in fertilized soil. Like in humid ecosystems, N gas loss via nitrification or denitrification appears to increase with increases in N and water availability during ecosystem development. Our results suggest that, with some exceptions, the drivers of soil GHG fluxes in semiarid ecosystems are often similar to those observed in more humid ecosystems. © 2015, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83476
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Natural Resources and Environmental Science, University of Nevada-Reno, 1664 N Virginia Street, Mail Stop 186, Reno, NV, United States; College of Forestry and Conservation, University of Montana, 32 Campus Drive, Missoula, MT, United States; Life and Environmental Sciences and Sierra Nevada Research Institute, University of California, Merced, 5200 N. Lake Road, Merced, CA, United States; Department of Biological Sciences and Center for Ecosystem Science and Society, Northern Arizona University, Flagstaff, AZ, United States
Recommended Citation:
Sullivan B.W.,Nasto M.K.,Hart S.C.,et al. Proximate controls on semiarid soil greenhouse gas fluxes across 3 million years of soil development[J]. Biogeochemistry,2015-01-01,125(3)