Journal
GEODERMA
Volume 405, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.geoderma.2021.115448
Keywords
Mineral-associated organic carbon; Erosion; X-ray absorption near-edge fine structure spectroscopy (XANES); Radiocarbon (C-14); Soil organic carbon; Synchrotron
Categories
Funding
- Canada Foundation for Innovation
- Natural Sciences and Engineering Research Council of Canada
- University of Saskatchewan
- Government of Saskatchewan
- Western Economic Diversification Canada
- National Research Council Canada
- Canadian Institutes of Health Research
- National Natural Science Foundation of China [42077063]
- National Science Foundation [EAR1253198]
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In steep mountainous landscapes constrained by erosion, the longevity of soil organic carbon is largely independent of organic matter chemistry.
Interactions between organic carbon (OC) and minerals represent a critical mechanism for stabilizing organic matter in soils. Because both mineral weathering and plant productivity are negatively affected by soil erosion, mineral-associated organic carbon (MOC) chemistry is also expected to vary with erosion intensity. Here we show that MOC chemistry, determined by carbon X-ray absorption near-edge fine structure spectroscopy (XANES), exhibits little difference across a large (10-fold) gradient in erosion-derived soil turnover times. Mineral-associated OC chemistry further fails to explain the variation in radiocarbon-based MOC turnover times. Our results suggest that soil OC longevity is largely independent of organic matter chemistry in steep mountainous landscapes where soil development is constrained by erosion.
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