闽江福州段湿地沉积物无机硫沿程分布特征及其影响因素  

Spatial distribution of inorganic sulfur and its key influencing factors in wetland sediments in Fuzhou reach of the Min River

作　　者：毛立 孙志高[1,2,3] 李亚瑾 厉彦哲 武慧慧 MAO Li;SUN Zhigao;LI Yajin;LI Yanzhe;WU Huihui(Fujian Provincial Key Laboratory for Subtropical Resources and Environment,Fujian Normal University,Fuzhou 350007;Key Laboratory of Humid Subtropical Eco-geographical Process(Fujian Normal University),Ministry of Education,Fuzhou 350007;Institute of Geography,Fujian Normal University,Fuzhou 350007)

机构地区：[1]福建师范大学福建省亚热带资源与环境重点实验室,福州350007 [2]福建师范大学湿润亚热带生态地理过程教育部重点实验室,福州350007 [3]福建师范大学地理研究所,福州350007

出　　处：《环境科学学报》2023年第4期467-477,共11页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.41971128);福建省公益类科研院所重点项目(No.2016R1032-1);福建师范大学地理科学学院研究生科研创新基金项目。

摘　　要：以闽江福州段河岸带及河口区不同类型湿地为研究对象,基于无机硫形态的连续提取,探讨了湿地沉积物中不同形态无机硫含量的沿程分布特征及其主要影响因素.结果表明,闽江福州段湿地沉积物中的H_(2)O-S、Adsorbed-S、HCl-Soluble-S和TIS含量整体均表现为淡水河段<城市河段<河口区,而HCl-Volatile-S含量表现为河口区<淡水河段<城市河段.H_(2)O-S、Adsorbed-S、HCl-Soluble-S和TIS含量在潮间盐水沼泽、淤泥质海滩和水产养殖场较高,而HCl-Volatile-S含量在灌丛沼泽较高.从淡水河段至河口区,Adsorbed-S、HCl-Soluble-S和HCl-Volatile-S占TIS的比例整体均呈降低趋势,而H_(2)O-S的占比呈增加趋势.就不同湿地而言,H_(2)O-S的占比在淤泥质海滩最高,Adsorbed-S的占比在沙石海滩最高,HCl-Soluble-S的占比在草本沼泽最高,而HCl-Soluble-S的占比在灌丛沼泽最高.闽江福州段不同河段沉积物中各形态无机硫的沿程分布主要受沉积物粒度、EC和pH的影响.研究发现,从淡水河段至河口区,尽管影响沉积物中各形态无机硫的关键因子发生了较大改变,但粒度组成对无机硫沿程分布的影响更为明显.This study investigated the spatial distribution of inorganic sulfur fractions and its key influencing factors in wetland sediments in Fuzhou reach of the Min River by the method of continuous sulfur extraction.Results indicated that the contents of H_(2)O-S,Adsorbed-S,HCl-Soluble-S and TIS in wetland sediments of different river segments generally followed the sequence of freshwater segment<urban segment<estuarine segment,while those of HCl-Volatile-S showed the order of estuarine segment<freshwater segment<urban segment.The contents of H_(2)O-S,Adsorbed-S,HCl-Soluble-S and TIS were much higher in salt marsh,sandy beach and aquaculture farm while those of HCl-Volatile-S were much higher in bush swamp.From freshwater segment to estuarine segment,the proportions of Adsorbed-S,HCl-Soluble-S and HCl-Volatile-S in TIS generally showed decreasing tendency,whereas those of H_(2)O-S demonstrated an increasing trend.For the different wetlands,the highest proportions of H_(2)O-S,Adsorbed-S and HCl-Soluble-S in TIS were observed in sandy beach,rocky coast and herbaceous swamp,respectively.By comparison,the highest proportion of HCl-Volatile-S in TIS occurred in bush swamp.The spatial distribution of inorganic sulfur fractions in wetland sediments in Fuzhou reach of the Min River were mainly affected by sediment grain composition,conductivity and pH.This study found that,from freshwater segment to estuarine segment,although the key factors influencing the distribution of inorganic sulfur fractions changed greatly,sediment grain composition might play more important role in affecting the distribution of inorganic sulfur.

关 键 词：无机硫形态 分布特征 湿地沉积物 福州段 闽江 

分 类 号：X522[环境科学与工程—环境工程] X14