title: Spatial distribution of organic and pyritic sulfur in surface sediments of eutrophic Jiaozhou Bay, China: clues to anthropogenic impacts.
abstract: Anthropogenic perturbations exert important impacts on sulfur geochemistry in marine sediments. In the study, chemical extraction was used to quantify four sulfur pools, i.e., pyrite, humic-acid sulfur (HA-S), fulvic-acid sulfur (FA-S), and residual organic sulfur (ROS), in surface sediments of eutrophic Jiaozhou Bay. Results show that riverine inputs are the main control on organic matter (OM) distribution in the sediments. OM enrichment in the eastern coast is mainly due to discharges of anthropogenic wastes. Spatial coupling of pyrite and FA-S vs. TOC points to the impacts of OM enrichment on formation and preservation of pyrite and FA-S. Poor spatial coupling of HA-S vs. TOC is due to low fractions of diagenetic OS in the pool. ROS is mainly from riverine inputs and anthropogenic OS has been superimposed on this pool. Spatial coupling among TOC, pyrite-S and FA-S is a sensitive indicator of anthropogenic impacts on benthic processes of the bay.
authors.affiliation: Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China; College of Marine Geosciences, Ocean University of China, Qingdao 266100, China.
authors.forename: Ke-Ke
authors.initials: KK
authors.lastname: Chen
authors.affiliation: Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China. Electronic address: zhumaoxu@ouc.edu.cn.
authors.forename: Mao-Xu
authors.initials: MX
authors.lastname: Zhu
authors.affiliation: Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
authors.forename: Gui-Peng
authors.initials: GP
authors.lastname: Yang
authors.affiliation: College of Marine Geosciences, Ocean University of China, Qingdao 266100, China.
authors.forename: De-Jiang
authors.initials: DJ
authors.lastname: Fan
authors.affiliation: Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
authors.forename: Xiang-Li
authors.initials: XL
authors.lastname: Huang
mesh_terms: D061006:Bays / Q000737:chemistry; D002681:China; D004777:Environment; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D007501:Iron / Q000032:analysis*; D013440:Sulfides / Q000032:analysis*; D013455:Sulfur / Q000032:analysis*
chemical_list: D013440:Sulfides; C011342:pyrite; D013455:Sulfur; D007501:Iron
keywords: Anthropogenic impact; Jiaozhou Bay; Organic sulfur; Pyrite; Spatial distribution