Iron-bound organic carbon dynamics in peatland profiles:The preservation equivalence of deep and surface soil

作     者：Xinya Huang Xinwei Liu Liangshuai Chen Yanfen Wang Huai Chen Xinya Huang;Xinwei Liu;Liangshuai Chen;Yanfen Wang;Huai Chen

作者机构：Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization&Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan ProvinceChengdu Institute of BiologyChinese Academy of SciencesChengdu 610041China Zoige Peatland and Global Change Research StationChinese Academy of SciencesHongyuan 624400China CAS Center for Excellence in Tibetan Plateau Earth SciencesChinese Academy of Sciences(CAS)Beijing 100101China. University of Chinese Academy of SciencesBeijing 100049China 

出 版 物：《Fundamental Research》 (自然科学基础研究（英文版）)

年 卷 期：2023年第3卷第6期

页      面：852-860页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学] 

基　　金：the Second Tibetan Plateau Scientific Expedition(2019QZKK0304) the Strategic Priority Research Program of Chinese Academy of Sciences(XDA2005010404) the Youth Science and Technology Innovation Team Program of Sichuan Province of China(2021JDTD011) 

主　　题：Iron-bound organic carbon Peatland Soil profile Reactive Fe Carbon preservation 

摘      要：More than half of the carbon pools in peatlands are stored in the soil layers below 30 cm,yet little is known about the carbon stabilizing factors at these *** iron oxide minerals are considered to be important for stabilizing organic carbon(OC),their role in the preservation of OC in peatlands,especially in the deep layers,is poorly ***,we collected 1 m soil profiles from six peatlands in Central and West China to quantitatively study the vertical distribution characteristics of iron-bound OC(Fe-bound OC),and the influencing physicochemical properties of the *** results showed that the content of reactive iron(FeR)was enriched in the top layer and decreased gradually with *** Fe-bound OC was positively correlated with FeR,its concentration did not decrease with depth in the peat *** were no obvious trends in the distributions of FeR and Fe-bound OC with water level fluctuations in the peat *** addition,the proportion of Fe-bound OC to soil organic carbon in the deep peat(31 to 100 cm)was equivalent to that in the surface peat(0 to 30 cm),indicating that iron oxide mineral provides comparable protection of OC in both *** to upper estimates of global peatland carbon storage(612 Pg),it could be predicted that 23.81±11.75 Pg of OC is protected by association with *** results indicated that iron oxide minerals are the effectiverusty sinkof OC sequestration in peatland,and a key factor for its long-term *** results from this study make a valuable contribution to the carbon dynamics knowledgebase for peatlands,and provide a basis for improved predictive simulations.