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- W1988101064 abstract "The second largest pool of terrestrial carbon is soil CaCO 3 In addition to being an important sink of atmospheric CO 2 , soil carbonate is potentially an important source of atmospheric CO 2 The cemented form of soil carbonate—the petrocalcic horizon—develops in geomorphically stable soil in arid, semiarid, and some subhumid climates. In many of these dryland areas, such as the Chihuahuan Desert of North America, erosion has stripped away overlying soil and exhumed the petrocalcic horizon, thereby exposing it to a weathering zone above the calcification zone where it normally forms. This research tested the hypothesis that soil type 1 (eroded Aridisols with exhumed petrocalcic horizons) will emit more CO 2 than soil type 2 (noneroded Aridisols with petrocalcic horizons) or soil type 3 (Entisols formed in sandy, noncalcareous sediments). We tested this hypothesis by comparing the amount of CO 2 and the δ 13 C of CO 2 released from the three soil types. Using a randomized complete block design, CO 2 emissions were measured using NaOH and soda lime traps from June 2002 to October 2003. Neither the NaOH traps nor soda lime traps detected any statistical difference in cumulative CO 2 emissions from the three soil types at the α = 0.05 level. Moreover, the isotopic analysis of CO 2 did not match the isotopic values of pedogenic carbonate, nor were there any statistical differences (α = 0.05) in δ 13 C of CO 2 among the three soil types. We conclude, therefore, that exhumed petrocalcic horizons are not actively emitting CO 2 at a rate significantly greater than adjacent soils, and thus carbon stored in petrocalcic horizons can be considered a recalcitrant reservoir within the decadal timeframe pertinent to carbon sequestration policies." @default.
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- W1988101064 date "2006-05-01" @default.
- W1988101064 modified "2023-09-23" @default.
- W1988101064 title "Carbon Dioxide Emissions from Exhumed Petrocalcic Horizons" @default.
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- W1988101064 doi "https://doi.org/10.2136/sssaj2005.0099" @default.
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