The "Iron Gate" Outcompetes the "Enzymic Latch" as the Dominant Soil Organic Carbon Stabilization Mechanism in Permafrost Peatlands of the Great Hing'an Mountains.

Shuping Kan, Weiping Yin, Zhao Li, Xinmiao Guo, Dalong Ma, Huan Yu, Yiting Zhao

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Article in Biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

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7 authors.

Shuping KanCollege of Geographical Sciences, Harbin Normal University, Harbin 150025, China.

Weiping YinCollege of Geographical Sciences, Harbin Normal University, Harbin 150025, China.

Zhao LiCollege of Geographical Sciences, Harbin Normal University, Harbin 150025, China.

Xinmiao GuoCollege of Geographical Sciences, Harbin Normal University, Harbin 150025, China.

Dalong MaCollege of Geographical Sciences, Harbin Normal University, Harbin 150025, China.

Huan YuCollege of Geographical Sciences, Harbin Normal University, Harbin 150025, China.

Yiting ZhaoCollege of Geographical Sciences, Harbin Normal University, Harbin 150025, China.

Funding

National Natural Science Foundation of China 42171127Natural Science Foundation of Heilongjiang Province of China PL2024D007

6 · The paper itself

Abstract

Distinct paradigms, such as the "enzymic latch" and "iron gate" theories, have been proposed to elucidate SOC loss or accumulation, but their relative significance and whether they are mutually exclusive in permafrost peatlands remain unclear. To address this, we evaluated their relative importance and identified the dominant factors controlling SOC stability. Therefore, we employed a space-for-time substitution approach across a permafrost gradient (continuous, discontinuous, and isolated) by systematically quantifying extracellular enzyme activities, iron (Fe) phases, and iron-bound soil organic carbon (Fe-SOC) at various depths (0-10, 10-30, and 30-50 cm) in peatlands. Our results did not support the "enzymic latch" theory, with hydrolytic enzyme activities (β-glucosidase (BG), cellobiohydrolase (CBH), and β-

Indexed as

ferric ironiron-bound soil organic carbonpermafrost peatlandsphenol oxidasesoil organic carbon

Identifiers

PMID41300296

DOI10.3390/biology14111504

PMCPMC12650353

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