Evaluating wetland soil carbon stability related to iron transformation during redox oscillations

doi:10.1016/j.geoderma.2022.116222

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	Evaluating wetland soil carbon stability related to iron transformation during redox oscillations
	Wang, Yiyun 1,5; Liu, Xiaoqing 1; Zhang, Xinying 1; Dai, Guohua ; Wang, Zhiheng 3,4; Feng, Xiaojuan 1,6
刊名	GEODERMA
	2022
卷号	428
关键词	Cyclic redox Iron -bound organic carbon CO 2 emissions Fen Bog
ISSN号	0016-7061
DOI	10.1016/j.geoderma.2022.116222
文献子类	Article
英文摘要	Redox shifts threaten to reduce the massive soil organic carbon (SOC) stocks in wetlands. However, ferrous iron [Fe(II)] oxidation may stabilize wetland SOC by reducing phenol oxidative activity, inhibiting CO2 emissions, and promoting SOC association with ferric Fe [Fe(III)] (oxyhydr)oxides. Yet the prevalence and efficacy of this mechanism are not clear. Here we select six contrasting soils from fens and bogs with different pH for microcosm incubation under cyclic redox conditions, with or without Fe(II) addition, and compared to static oxic incubation. CO2 emissions, microbial composition, enzyme activities, Fe species, and organic matter properties were measured to test the related mechanism. We found that compared to static oxic conditions, the response of Fe(II) to cyclic redox conditions (indicated by the response ratio of -0.48 to 0.53) was positively correlated with that of phenol oxidative activity and cumulative CO2 at the end of the incubation. Redox cycling had little effect on Febound SOC (assessed by the modified citrate-bicarbonate-dithionite extraction), although Fe(II) addition increased Fe-bound SOC in all soils under cyclic redox owing to the production of short-range-ordered Fe(III) (oxyhydr)oxides (quantified by oxalate extraction). Furthermore, Fe(II) addition decreased CO2 emissions from three soils with pH > 6 but increased CO2 emissions from the Sphagnum-dominated soil, which had elevated Fe (II) levels after the incubation. These findings highlight the SOC stabilization potential of Fe(II) addition to wetland soils experiencing redox oscillations by promoting the accumulation of Fe-bound SOC as well as decreasing CO2 emissions (in response to phenol oxidative activity), especially in non-Sphagnum-dominated freshwater wetlands with relatively high pH.
学科主题	Soil Science
电子版国际标准刊号	1872-6259
出版地	AMSTERDAM
WOS关键词	ORGANIC-MATTER DECOMPOSITION ; SORPTIVE STABILIZATION ; FERRIHYDRITE ; PRESERVATION ; OXIDATION ; GOETHITE ; OXYGEN ; OXIDE ; FE ; ASSOCIATIONS
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000919522500006
资助机构	National Natural Science Foundation of China ; [42025303] ; [31988102] ; [41773067]
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/28968]
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 2.Chinese Acad Sci, Inst Bot, 20 Nanxincun Xiangshan, Beijing 100093, Peoples R China 3.Peking Univ, Inst Ecol, Coll Urban & Environm Sci, Beijing 100871, Peoples R China 4.East China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai 200241, Peoples R China 5.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China 6.Peking Univ, Coll Urban & Environm Sci, Key Lab Earth Surface Proc, Minist Educ, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Wang, Yiyun,Liu, Xiaoqing,Zhang, Xinying,et al. Evaluating wetland soil carbon stability related to iron transformation during redox oscillations[J]. GEODERMA,2022,428.
APA	Wang, Yiyun,Liu, Xiaoqing,Zhang, Xinying,Dai, Guohua,Wang, Zhiheng,&Feng, Xiaojuan.(2022).Evaluating wetland soil carbon stability related to iron transformation during redox oscillations.GEODERMA,428.
MLA	Wang, Yiyun,et al."Evaluating wetland soil carbon stability related to iron transformation during redox oscillations".GEODERMA 428(2022).