期刊
SCIENCE
卷 360, 期 6385, 页码 209-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aao6463
关键词
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资金
- NSF Graduate Research Fellowship [2012126152]
- WHOI Ocean Ventures Fund
- European Research Council [678779 ROC-CO2]
- NSF [OCE-0851015, OCE-0928582]
- WHOI Independent Study Award [27005306]
Lithospheric organic carbon (petrogenic; OCpetro) is oxidized during exhumation and subsequent erosion of mountain ranges. This process is a considerable source of carbon dioxide (CO2) to the atmosphere over geologic time scales, but the mechanisms that govern oxidation rates in mountain landscapes are poorly constrained. We demonstrate that, on average, 67 +/- 11% of the OCpetro initially present in bedrock exhumed from the tropical, rapidly eroding Central Range of Taiwan is oxidized in soils, leading to CO2 emissions of 6.1 to 18.6 metric tons of carbon per square kilometer per year. The molecular and isotopic evolution of bulk OC and lipid biomarkers during soil formation reveals that OCpetro remineralization is microbially mediated. Rapid oxidation in mountain soils drives CO2 emission fluxes that increase with erosion rate, thereby counteracting CO2 drawdown by silicate weathering and biospheric OC burial.
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