Iron Reduction Controls Carbon Mineralization in Aquaculture Shrimp Pond Sediments in Subtropical Estuaries

doi:10.1029/2022JG007081

	Iron Reduction Controls Carbon Mineralization in Aquaculture Shrimp Pond Sediments in Subtropical Estuaries
	Tan, Ji 1,2,3,4; Luo, Min 2,4; Tan, Fengfeng 1,2,3; Lichtfouse, Eric 5; Zhang, Changwei 1,2,4; Chen, Xin 1,2,4; Huang, Jiafang 1,2,3; Tan, Yang6 ; Xiao, Leilei6,7
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
ISSN	2169-8953
	2022-12-01
卷号	127 期号:12 页码:20
关键词	microbial Fe(III) reduction sulfate reduction methanogenesis carbon mineralization salinity aquaculture pond
DOI	10.1029/2022JG007081
通讯作者	Luo, Min(luomin@fzu.edu.cn) ; Xiao, Leilei(llxiao@yic.ac.cn)
英文摘要	Expanding worldwide aquaculture has greatly increased greenhouse gas emissions; however, the underlying microbial mechanisms are poorly understood. In particular, the role of ferric iron [Fe(III)] (hydro)oxides in carbon mineralization in aquaculture pond sediments remains unclear. Here, we studied the rates of microbial Fe(III) reduction, sulfate reduction, methanogenesis, and carbon mineralization in aquaculture shrimp (Litopenaeus vannamei) ponds of various salinities before, during, and after shrimp farming in subtropical estuaries in southeast China. Sediment samples (0-10 cm) were collected to investigate the content of iron species, characteristics of organic matter, and abundance of Geobacter, a proxy of iron reducers. Overall, Fe(III) reduction (46.1% 19.1%) dominated carbon mineralization, followed by sulfate reduction (39.6% 16.8%) and methanogenesis (1.5% 1.1%). Microbial Fe(III) reduction contributed more to carbon mineralization during farming than before and after farming. This enhancement in Fe(III) reduction is attributed to a significant increase in Fe(III) content during farming. Additionally, the contributions of microbial Fe(III) reduction to carbon mineralization were lower in the high-salinity ponds than in the low-salinity ponds due to the suppression of sulfate reduction, abiotic Fe(III) reduction by sulfides, and lower oxidation-reduction potential. Our findings demonstrate that microbial Fe(III) reduction plays a significant role in carbon mineralization in aquaculture pond sediments. Future carbon flux prediction models of aquaculture pond systems should fully integrate microbial Fe(III) reduction. Plain Language Summary The expanding global aquaculture industry has greatly increased the carbon mineralization potential (i.e., production of carbon dioxide and methane). Carbon mineralization is mediated by various types of microbial respiration, including iron reduction, sulfate reduction, and methanogenesis. Aquatic sediments are enriched with iron oxides; however, the contribution of microbial iron reduction to carbon mineralization in the aquaculture sediments is poorly understood. Here, we studied the rates and pathways of carbon mineralization in aquaculture shrimp (Litopenaeus vannamei) ponds of varying salinities before, during, and after shrimp farming in subtropical estuaries in southeast China. Our results show that microbial iron reduction has a larger contribution to carbon mineralization during farming than before and after farming. In addition, the contributions of microbial iron reduction to carbon mineralization were lower in the high-salinity ponds than in the low-salinity ponds. Overall, microbial iron reduction contributed approximately 46% to carbon mineralization, followed by sulfate reduction (approximately 40%) and methanogenesis (approximately 2%). Our findings demonstrate that microbial iron reduction plays a significant role in carbon mineralization in aquaculture pond sediments. Microbial Fe(III) reduction should be involved in future carbon flux prediction models of aquaculture pond systems.
资助机构	National Science Foundation of China ; Natural Science Foundation of Fujian Province ; Science and Technology Projects of the Forest Bureau of Fujian Province ; Youth Innovation Promotion Association, CAS
收录类别	SCI
语种	英语
关键词[WOS]	DISSOLVED ORGANIC-MATTER ; FE(III) OXIDE REDUCTION ; FRESH-WATER ; SALTWATER INTRUSION ; INUNDATION GRADIENT ; COMMUNITY STRUCTURE ; METHANE PRODUCTION ; REDUCING BACTERIA ; RIVER ESTUARY ; OXIDATION
研究领域[WOS]	Environmental Sciences & Ecology ; Geology
WOS记录号	WOS:000924557800001
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.yic.ac.cn/handle/133337/32646
专题	中国科学院海岸带环境过程与生态修复重点实验室支撑部门_所级公共技术服务中心
通讯作者	Luo, Min; Xiao, Leilei
作者单位	1.Fujian Normal Univ, Key Lab Humid Subtrop Ecogeog Proc, Minist Educ, Fuzhou, Peoples R China 2.Fuzhou Univ, Res Ctr Geog & Ecol Environm, Fuzhou, Peoples R China 3.Fujian Normal Univ, Coll Geog Sci, Fuzhou, Peoples R China 4.Fuzhou Univ, Coll Environm & Safety Engn, Fuzhou, Peoples R China 5.Aix Marseille Univ, CEREGE, INRAE, CNRS,IRD, Aix En Provence, France 6.Chinese Acad Sci, Yantai Inst Coastal Zone Res, CAS Key Lab Coastal Environm Proc & Ecol Remediat, Yantai, Peoples R China 7.Shandong Key Lab Coastal Environm Proc, Yantai, Peoples R China
推荐引用方式 GB/T 7714	Tan, Ji,Luo, Min,Tan, Fengfeng,et al. Iron Reduction Controls Carbon Mineralization in Aquaculture Shrimp Pond Sediments in Subtropical Estuaries[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2022,127(12):20.
APA	Tan, Ji.,Luo, Min.,Tan, Fengfeng.,Lichtfouse, Eric.,Zhang, Changwei.,...&Xiao, Leilei.(2022).Iron Reduction Controls Carbon Mineralization in Aquaculture Shrimp Pond Sediments in Subtropical Estuaries.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,127(12),20.
MLA	Tan, Ji,et al."Iron Reduction Controls Carbon Mineralization in Aquaculture Shrimp Pond Sediments in Subtropical Estuaries".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 127.12(2022):20.