摘要
还原性无机硫(Reduced inorganic sulfur,RIS)是沉积物硫最活跃的组分,对水生态系统铁、磷以及重金属等元素的地球化学循环具有控制作用,目前氧化还原环境梯度变化明显的筑坝河流沉积物硫分布格局及其机理研究仍很缺乏.结合野外原位采样和室内连续分级提取,在九龙江流域梯级水库作用下,探究表层沉积物RIS赋存形态、含量及其空间分布格局.结果表明:九龙江表层沉积物RIS各组分含量从高到低排序为:黄铁矿硫(Pyrite-S)>酸可挥发性硫化物(AVS)>单质硫(ES),其中以Pyrite-S为主要赋存形态,在RIS中的占比为83%~90%.九龙江流域不同类型水体沉积物RIS含量大小顺序为:水库>支流>干流,其中北溪、西溪表层沉积物RIS分布与水库的空间布局高度匹配,大致呈现水库斑块化热点分布,而南溪沉积物RIS沿水流方向从上游至下游却呈逐渐增加趋势,表明梯级水库的拦截效应增强了RIS在水库沉积物的累积强度.该结果增强了水库建设运行在流域尺度上对表层沉积物硫生物地化循环的影响认识,对九龙江流域的水环境保护与管理策略具有重要的理论和现实意义.
Reduced inorganic sulfur(RIS)is the most active sulfur component in sediment,which controls the geochemical cycling of Fe,P,and heavy metals in aquatic ecosystems.However,the understanding on the distribution pattern of sediment sulfur and its mechanism in dammed rivers,where with redox environmental gradients undergo significant changes,remains limited.Combing field in situ sampling and sequential extraction procedure in the laboratory,we investigated the forms,concentrations,and spatial distribution pattern of RIS in surface sediments under the influences of cascade reservoirs in Jiulong River Watershed.The results showed that the concentrations of RIS in surface sediments of Jiulong River followed a descending order of:Pyrite-S>acid volatile sulfide(AVS)>essential sulfur(ES),among which Pyrite-S was the dominant form,accounting for 83%to 90%of RIS.The sediment RIS concentrations of different types of water bodies in the Jiulong River watershed were in the order of reservoirs>tributaries>main streams.The distribution of RIS in surface sediments,such as Beixi River and Xixi River,was closely associated with the spatial location of reservoirs,showing a hotspot patches distribution.While the sediment RIS concentrations in the Nanxi River showed a gradually increasing trend from upstream to downstream along the flow direction.The construction and operation of cascade reservoirs played a role in intensifying the accumulation of RIS in sediments,reflecting an interception effect.These results advance our understanding of the influence of reservoir construction and operation on the surface sediment sulfur biogeochemical cycle at the watershed scale.This knowledge holds significant theoretical and practical significance for water environment protection and management strategies in Jiulong River Watershed.
作者
李松
余居华
王丽
王煌平
郑祥洲
王利民
丁洪
张玉树
LI Song;YU Juhua;WANG Li;WANG Huangping;ZHENG Xiangzhou;WANG Limin;DINGHong;ZHANG Yushu(School of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074;Institute of Soil and Fertilizer,Fujian Academy of Agricultural Sciences,Fuzhou 350013;Fujian Key Laboratory of Plant Nutrition and Fertilizer,Fuzhou 350013)
出处
《环境科学学报》
CAS
CSCD
北大核心
2023年第11期125-133,共9页
Acta Scientiae Circumstantiae
基金
国家自然科学基金项目(No.51709183)
中国博后基金项目(No.2017M611862)
福建省属公益科研院所基金项目(No.2020R1025001,YC2019007,ZYTS2019016,ZYTS202218,CXTD2021012-2)
福建省农业科学院对外合作项目(No.DEC2019-05,DWHZ-2022-11)。
关键词
沉积物
还原性无机硫
赋存形态
丰水期
水库
九龙江
sediment
reduced inorganic sulfur
form
flooding season
reservoir
Jiulong River
