Arid
DOI10.1007/s10533-017-0372-3
The concurrent use of novel soil surface microclimate measurements to evaluate CO2 pulses in biocrusted interspaces in a cool desert ecosystem
Tucker, Colin L.1; McHugh, Theresa A.1,2; Howell, Armin1; Gill, Richard3; Weber, Bettina4; Belnap, Jayne1; Grote, Edmund1; Reed, Sasha C.1
通讯作者Tucker, Colin L.
来源期刊BIOGEOCHEMISTRY
ISSN0168-2563
EISSN1573-515X
出版年2017
卷号135期号:3页码:239-249
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.


英文关键词Biological soil crusts Carbon cycle Drylands Pulse-dynamic wetting Soil respiration Surface soil moisture
类型Article
语种英语
国家USA ; Germany
收录类别SCI-E
WOS记录号WOS:000411147100004
WOS关键词TEMPERATURE SENSITIVITY ; SEMIARID ECOSYSTEMS ; CLIMATE-CHANGE ; PRECIPITATION ; WATER ; RESPIRATION ; DECOMPOSITION ; VARIABILITY ; FEEDBACKS
WOS类目Environmental Sciences ; Geosciences, Multidisciplinary
WOS研究方向Environmental Sciences & Ecology ; Geology
来源机构United States Geological Survey
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/197798
作者单位1.US Geol Survey, Southwest Biol Sci Ctr, Moab, UT 84532 USA;
2.Colorado Mesa Univ, Dept Biol Sci, Grand Junction, CO 81501 USA;
3.Brigham Young Univ, Dept Biol, Provo, UT 84602 USA;
4.Max Planck Inst Chem, Multiphase Chem Dept, Mainz, Germany
推荐引用方式
GB/T 7714
Tucker, Colin L.,McHugh, Theresa A.,Howell, Armin,et al. The concurrent use of novel soil surface microclimate measurements to evaluate CO2 pulses in biocrusted interspaces in a cool desert ecosystem[J]. United States Geological Survey,2017,135(3):239-249.
APA Tucker, Colin L..,McHugh, Theresa A..,Howell, Armin.,Gill, Richard.,Weber, Bettina.,...&Reed, Sasha C..(2017).The concurrent use of novel soil surface microclimate measurements to evaluate CO2 pulses in biocrusted interspaces in a cool desert ecosystem.BIOGEOCHEMISTRY,135(3),239-249.
MLA Tucker, Colin L.,et al."The concurrent use of novel soil surface microclimate measurements to evaluate CO2 pulses in biocrusted interspaces in a cool desert ecosystem".BIOGEOCHEMISTRY 135.3(2017):239-249.
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