滨海红树林泥炭沉积物中硫的赋存特点及其控制因素

海南和厦门两地滨海红树林沉积物和埋藏泥炭中硫的成分分析表明，滨海红树林沉积物和泥炭中的硫以硫化铁硫为主，有机硫次之，硫酸盐硫含量最低。泥炭沉积物中硫的赋存形式和特点与沉积环境密切相关。海南福田地区红树林泥炭沉积物主要形成于红树林潮上坪和泥炭坪，硫含量较高，平均为2.60%，且有机硫含量与有机碳含量呈正相关，而硫化铁硫含量与有机碳含量没有明显的相关性；厦门海沧镇红树林泥炭沉积物形成于红树林潮间坪以及潮道环境，硫含量较低，平均值仅为0.43%，形态硫和有机质的相关性与海南红树林泥炭地沉积物相反。红树林泥炭沉积物中铁的硫化物主要以黄铁矿形式产出，且以莓球状形态为主。研究表明，黄铁矿与次生有机硫的生成与微生物活动密切相关，造成红树林泥炭中硫含量差异最主要的原因不是硫源，而是有机质的供给与沉积微环境的影响。现代滨海红树林泥炭沼泽中硫的赋存特征将对煤中硫成因的研究提供重要的科学依据。

The Characteristics and Controlling Factors of Sulfur in the Sediments of Coastal Mangrove Peat

This paper studies the sulfur composition of sediments and buried peat from Haicang of Fujian province and Futian of Hainan province.The results show that the contents of sulfur in iron-sulfide are much greater than those of the other forms of sulfur.At both sites the contents of organic sulfur are lower,and the contents of the sulfate sulfur are the lowest.The mangrove peat of the Futian site is formed in the upshore intertidal flat and peat flat,and its average sulfur contents are up to 2.60%, and the contents of organic sulfur are well correlated to the organic carbon.However,the correlation between iron-sulfide and organic carbon contents is not very clear.On the other hand,the Haicang site is mainly intertidal flat and tidal channel,with average content of sulfur only 0.43%,and the correlation features between sulfur and organic matter of the sediments are reverse compared with the Futian site.It is noteworthy that the major composition of iron sulphide in coastal mangrove sediments is pyrite and mostly in the form of pyrite framboids.Recent researches have demonstrated that the activity of microorganisms is ubiquitous in mangrove sediments which plays a key role in the formation of pyrite framboids.Therefore,the differences of sulfur contents between the tested coastal mangrove sediments could be explained by the effects of organic matter and sedimentary environment rather than the sulfur source.The characteristics of sulfur in the sediments of coastal mangrove will provide theoretical basis for understanding the formation mechanism of sulfur in coal.