Arid
DOI10.1007/s10533-017-0360-7
Soil organic carbon partitioning and Delta C-14 variation in desert and conifer ecosystems of southern Arizona
Lybrand, Rebecca A.1,2; Heckman, Katherine3; Rasmussen, Craig1
通讯作者Lybrand, Rebecca A.
来源期刊BIOGEOCHEMISTRY
ISSN0168-2563
EISSN1573-515X
出版年2017
卷号134期号:3页码:261-277
英文摘要

Soils are significant terrestrial carbon stores yet the mechanisms that stabilize organic carbon in mineral soil remain poorly constrained. Here, we identified climate and topographic controls on soil organic carbon storage along the Catalina Critical Zone Observatory that spans a significant range in mean annual temperature (> 10 degrees C) and mean annual precipitation (> 50 cm year(-1)). Granitic soils were collected from divergent summit and convergent footslope positions in desert scrub, pine, and mixed conifer systems. Physical soil carbon distribution was quantified using a density and sonication technique to obtain the "free," "occluded," and heavy "mineral" soil carbon pools. We examined bulk soil (< 2 mm) and density fractions using total carbon (%), stable isotopic composition (delta C-13), and radiocarbon analyses (Delta C-14). Desert scrub soils stored minimal soil carbon (< 1% by weight) that was partitioned to the heavy mineral pool. Surprisingly, we identified depleted Delta C-14 in the bulk soil (-9 to -66 parts per thousand) and mineral C fractions (-72 to -90 parts per thousand) from subsurface weathered granite in the desert system. The transition to the productive P. pine ecosystem was met with more soil C (> 3%) that partitioned evenly between the free light and mineral fractions. Soil C in the P. pine system also reflected the impact of a moderate severity fire in 2002 that led to modern Delta C-14 values for bulk soil and density fractions. The mixed conifer system contained a greater proportion of passive occluded C in the subsurface soils. We observed evidence for modern fire inputs into the surface soils of the mixed conifer system in combination with buried charcoal and occluded C associated with historic fire events. Convergent landscapes contained higher soil carbon stocks and depleted Delta C-14 relative to adjacent divergent landscapes, suggesting a landscape-level mechanism that includes the transport, burial, and preservation of soil carbon downslope. These data sets provide insights into ecosystem- and hillslope-scale variations in soil carbon storage across semiarid to subhumid environments.


英文关键词Climate Critical zone Desert soil Forest soil Soil organic carbon Topography
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000408095700003
WOS关键词SANTA-CATALINA MOUNTAINS ; SEMIARID ENVIRONMENTAL GRADIENT ; FIRE HISTORY ; ELEVATION GRADIENT ; BULK-DENSITY ; MATTER DYNAMICS ; MINERAL-SOIL ; FOREST SOILS ; SKY ISLANDS ; VEGETATION
WOS类目Environmental Sciences ; Geosciences, Multidisciplinary
WOS研究方向Environmental Sciences & Ecology ; Geology
来源机构University of Arizona ; E18
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/197796
作者单位1.Univ Arizona, Dept Soil Water & Environm Sci, Tucson, AZ 85721 USA;
2.Oregon State Univ, Dept Crop & Soil Sci, Corvallis, OR 97331 USA;
3.Forest Serv, Northern Res Stn, USDA, Houghton, MI 49931 USA
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Lybrand, Rebecca A.,Heckman, Katherine,Rasmussen, Craig. Soil organic carbon partitioning and Delta C-14 variation in desert and conifer ecosystems of southern Arizona[J]. University of Arizona, E18,2017,134(3):261-277.
APA Lybrand, Rebecca A.,Heckman, Katherine,&Rasmussen, Craig.(2017).Soil organic carbon partitioning and Delta C-14 variation in desert and conifer ecosystems of southern Arizona.BIOGEOCHEMISTRY,134(3),261-277.
MLA Lybrand, Rebecca A.,et al."Soil organic carbon partitioning and Delta C-14 variation in desert and conifer ecosystems of southern Arizona".BIOGEOCHEMISTRY 134.3(2017):261-277.
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