Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 43, Issue 19, Pages 10286-10294Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL070071
Keywords
permafrost; Qinghai-Tibetan Plateau; soil organic carbon; iron; carbon stabilization
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Funding
- National Natural Science Foundation of China [91325202, 41601063, 41330634]
- National Key Scientific Research Project [2013CBA01802]
- Open Foundations of the State Key Laboratory of Frozen Soil Engineering [SKLFSE201408]
- State Key Laboratory of Cryosphere Sciences [SKLCS-OP-2014-08]
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A close relationship exists between soil organic carbon (SOC) and reactive iron; however, little is known about the role of iron in SOC preservation in permafrost regions. We determined the amount of SOC associated with reactive iron phases (OC-Fe) in the permafrost regions of the Qinghai-Tibetan Plateau (QTP). The results showed that the percentage of OC-Fe ranged between 0.9% and 59.5% in the upper 30cm of soil and that the OC-Fe represented 19.512.3% of the total SOC pool. No clear vertical distribution pattern in OC-Fe was present in the upper 1m of soil. Throughout the year, the OC-Fe accounted for relatively stable proportions of the total SOC pool. This study suggests that approximately 20% of SOC is a potential rusty OC pool in the permafrost regions of the QTP. Biogeochemical processes related to the reaction of iron may play important roles in soil carbon cycles in permafrost regions.
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