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 

机构地区：[1]Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization&Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province,Chengdu Institute of Biology,Chinese Academy of Sciences,Chengdu 610041,China [2]Zoige Peatland and Global Change Research Station,Chinese Academy of Sciences,Hongyuan 624400,China [3]CAS Center for Excellence in Tibetan Plateau Earth Sciences,Chinese Academy of Sciences(CAS),Beijing 100101,China. [4]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Fundamental Research》2023年第6期852-860,共9页自然科学基础研究（英文版）

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).

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 depths.Although 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 understood.Here,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 soil.The results showed that the content of reactive iron(FeR)was enriched in the top layer and decreased gradually with depth.While Fe-bound OC was positively correlated with FeR,its concentration did not decrease with depth in the peat profile.There were no obvious trends in the distributions of FeR and Fe-bound OC with water level fluctuations in the peat profile.In 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 layers.According 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 FeR.These results indicated that iron oxide minerals are the effective"rusty sink"of OC sequestration in peatland,and a key factor for its long-term preservation.The results from this study make a valuable contribution to the carbon dynamics knowledgebase for peatlands,and provide a basis for improved predictive simulations.

关 键 词：Iron-bound organic carbon PEATLAND Soil profile Reactive Fe Carbon preservation 

分 类 号：P59[天文地球—地球化学]