DOI: 10.1007/s10533-017-0372-3
Scopus记录号: 2-s2.0-85028990037
论文题名: The concurrent use of novel soil surface microclimate measurements to evaluate CO2 pulses in biocrusted interspaces in a cool desert ecosystem
作者: Tucker C.L. ; McHugh T.A. ; Howell A. ; Gill R. ; Weber B. ; Belnap J. ; Grote E. ; Reed S.C.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 135, 期: 3 起始页码: 239
结束页码: 249
语种: 英语
英文关键词: Biological soil crusts
; Carbon cycle
; Drylands
; Pulse-dynamic wetting
; Soil respiration
; Surface soil moisture
Scopus关键词: carbon cycle
; carbon dioxide
; carbon flux
; desert
; dryland farming
; microclimate
; soil moisture
; soil profile
; soil respiration
; soil surface
; surface layer
; vascular plant
; wetting
; Tracheophyta
英文摘要: Carbon cycling associated with biological soil crusts, which occupy interspaces between vascular plants in drylands globally, may be an important part of the coupled climate-carbon cycle of the Earth system. A major challenge to understanding CO2 fluxes in these systems is that much of the biotic and biogeochemical activity occurs in the upper few mm of the soil surface layer (i.e., the ‘mantle of fertility’), which exhibits highly dynamic and difficult to measure temperature and moisture fluctuations. Here, we report a multi-sensor approach to simultaneously measuring temperature and moisture of this biocrust surface layer (0–2 mm), and the deeper soil profile, concurrent with automated measurement of surface soil CO2 effluxes. Our results illuminate robust relationships between biocrust water content and field CO2 pulses that have previously been difficult to detect and explain. All observed CO2 pulses over the measurement period corresponded to surface wetting events, including when the wetting events did not penetrate into the soil below the biocrust layer (0–2 mm). The variability of temperature and moisture of the biocrust surface layer was much greater than even in the 0–5 cm layer of the soil beneath the biocrust, or deeper in the soil profile. We therefore suggest that coupling surface measurements of biocrust moisture and temperature to automated CO2 flux measurements may greatly improve our understanding of the climatic sensitivity of carbon cycling in biocrusted interspaces in our study region, and that this method may be globally relevant and applicable. © 2017, Springer International Publishing AG (outside the USA). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83240
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: US Geological Survey, Southwest Biological Science Center, Moab, UT, United States; Department of Biological Sciences, Colorado Mesa University, Grand Junction, CO, United States; Department of Biology, Brigham Young University, Provo, UT, United States; Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany
Recommended Citation:
Tucker C.L.,McHugh T.A.,Howell A.,et al. The concurrent use of novel soil surface microclimate measurements to evaluate CO2 pulses in biocrusted interspaces in a cool desert ecosystem[J]. Biogeochemistry,2017-01-01,135(3)