Labile and recalcitrant sediment organic carbon pools in the Pearl River Estuary, southern China
Lian, ZL; Jiang, ZJ; Huang, XP; Liu, SL; Zhang, JP; Wu, YC; jiangzj1982@scsio.ac.cn; xphuang@scsio.ac.cn
2018
发表期刊SCIENCE OF THE TOTAL ENVIRONMENT
卷号640页码:1302-1311
摘要Little is known about the labile and recalcitrant sediment organic carbon (SOC) in estuarine ecosystem, and the effects of human activities on SOC sequestration also remain poorly understood. In this study, sediment cores in the Pearl River Estuary (PRE) and adjacent coastal areas in the South China Sea were collected to analyse variations in the sources of SOC and its labile and recalcitrant pools. Concentrations of SOC, microbial biomass carbon (MBC), and recalcitrant organic carbon (ROC) ranged from 4.37 to 10.4 g/kg, 0.522 to 1.53 g/kg, and 1.59 to 5.42 g/kg, respectively, with their corresponding mean values as 7.20 +/- 1.43 g/kg, 0.896 +/- 0.228 g/kg, and 3.71 +/- 1.01 g/kg, respectively. ROC was the chief fraction of SOC, and SOC, MBC and ROC has a similar source. Higher SOC and MBC were observed in the upper sediments, which might be attributable to the enhancement of seawater nutrient and particulate organic carbon concentrations in recent decades. Higher concentrations of SOC, ROC, and SOC stock were found in the inner estuary relative to the outer estuary due to a higher terrigenous organic carbon contribution, while the ratio of water-soluble organic carbon, salt-extractable carbon, and MBC to SOC exhibited a contrasting trend caused by a higher autochthonous contribution. Sand excavation reduced SOC, ROC, ROC/SOC, and SOC stock. The estimated SOC stock of the top 75 cm of sediment in the PRE was 34.0 Mg C ha(-1), and the reduction of SOC stock in the PRE due to sea reclamation from 1973 to 2015 was 1,171,159.6 Mg C. Therefore, measures should be taken to control sea reclamation and sand excavation activities in the PRE to enhance carbon sequestration capacity. (c) 2018 Elsevier B.V. All rights reserved.
部门归属[Lian, Zhonglian; Jiang, Zhijian; Huang, Xiaoping; Liu, Songlin; Zhang, Jingping; Wu, Yunchao] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Trop Marine Bioresources & Ecol, Guangzhou 510301, Guangdong, Peoples R China; [Lian, Zhonglian; Jiang, Zhijian; Huang, Xiaoping; Liu, Songlin; Wu, Yunchao] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Lian, Zhonglian] State Ocean Adm, South China Sea Monitoring Ctr, Guangzhou 510300, Guangdong, Peoples R China
学科领域Environmental Sciences & Ecology
关键词[WOS]Sediment organic carbon ; Labile pools ; Recalcitrant pools ; Sources ; Carbon sequestration ; Anthropogenic activities
资助项目LMB
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/16912
专题中科院海洋生物资源可持续利用重点实验室
通讯作者jiangzj1982@scsio.ac.cn; xphuang@scsio.ac.cn
推荐引用方式
GB/T 7714
Lian, ZL,Jiang, ZJ,Huang, XP,et al. Labile and recalcitrant sediment organic carbon pools in the Pearl River Estuary, southern China[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2018,640:1302-1311.
APA Lian, ZL.,Jiang, ZJ.,Huang, XP.,Liu, SL.,Zhang, JP.,...&xphuang@scsio.ac.cn.(2018).Labile and recalcitrant sediment organic carbon pools in the Pearl River Estuary, southern China.SCIENCE OF THE TOTAL ENVIRONMENT,640,1302-1311.
MLA Lian, ZL,et al."Labile and recalcitrant sediment organic carbon pools in the Pearl River Estuary, southern China".SCIENCE OF THE TOTAL ENVIRONMENT 640(2018):1302-1311.
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