globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-015-0078-3
Scopus记录号: 2-s2.0-84939935088
论文题名:
Climatic and landscape influences on soil moisture are primary determinants of soil carbon fluxes in seasonally snow-covered forest ecosystems
作者: Stielstra C.M.; Lohse K.A.; Chorover J.; McIntosh J.C.; Barron-Gafford G.A.; Perdrial J.N.; Litvak M.; Barnard H.R.; Brooks P.D.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 123, 期:3
起始页码: 447
结束页码: 465
语种: 英语
英文关键词: Carbon cycle ; Climate ; Forests ; Soil moisture ; Soil respiration
英文摘要: A changing climate has the potential to mobilize soil carbon, shifting seasonally snow-covered, forested ecosystems from carbon sinks to sources. To determine the sensitivity of soil carbon fluxes to changes in temperature and moisture, we quantified seasonal and spatial variability of soil carbon dioxide (CO2) fluxes (N = 746) and dissolved organic carbon (DOC) in leachate (N = 260) in high-elevation, mixed conifer forests in Arizona and New Mexico. All sites have cold winters, warm summers, and bimodal soil moisture patterns associated with snowmelt and summer monsoon rainfall. We employed a state factor approach, quantifying how distal controls (parent material, regional climate, topography) interacted with proximal variability in soil temperature (−3 to 26 °C) and moisture (2–76 %) to influence carbon effluxes. Carbon loss was dominated by CO2 flux (250–1220 g C m−2 year−1) rather than leached DOC (7.0–9.4 g C m−2 year−1). Significant differences in mean growing season CO2 flux were associated with parent material and aspect; differences appear to be mediated by how these distal controls influence primarily moisture and secondarily temperature. Across all sites, a multiple linear regression model (MLR) relying on moisture and temperature best described growing season CO2 fluxes (r2 = 0.63, p < 0.001). During winter, the MLR describing soil CO2 flux (r2 = 0.98, p < 0.001) relied on distal factors including snow cover, clay content, and bulk carbon, all factors that influence liquid water content. Our findings highlight the importance of state factors in controlling soil respiration primarily through influencing spatial and temporal heterogeneity in soil moisture. © 2015, Springer International Publishing Switzerland.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83524
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 Hydrology and Water Resources, 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; School of Geography & Development, University of Arizona, Tucson, AZ, United States; B2 Earthscience, Biosphere 2, University of Arizona, Tucson, AZ, United States; Department of Geology, University of Vermont, Burlington, VT, United States; Department of Biological Science, University of New Mexico, Albuquerque, NM, United States; Department of Geography and INSTAAR, University of Colorado, Boulder, CO, United States; Department of Geology/Geophysics, University of Utah, 115 So. 1460 East, Salt Lake City, UT, United States

Recommended Citation:
Stielstra C.M.,Lohse K.A.,Chorover J.,et al. Climatic and landscape influences on soil moisture are primary determinants of soil carbon fluxes in seasonally snow-covered forest ecosystems[J]. Biogeochemistry,2015-01-01,123(3)
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