喀斯特小流域石灰土硫形态和硫酸盐还原菌分布特征

发布时间：2018-02-24 03:36

本文关键词： 喀斯特小流域石灰土硫形态硫酸盐还原菌　出处：《生态与农村环境学报》2017年07期 　论文类型：期刊论文

【摘要】：用土壤硫形态连续提取和微生物学方法分析了石灰土中总硫、SO_4~(2-)、总还原态硫(TRIS)、有机硫含量以及硫酸盐还原菌(SRB)类群和数量,目的是阐明西南酸沉降地区土壤中硫化物积累和SRB的分布特征。有机硫是主要的硫形态,SO_4~(2-)是主要的无机硫形态。石灰土中检出脱硫叶菌属和脱硫弧菌属-脱硫微菌属类群。石灰土剖面中SRB数量与TRIS含量增大的深度对应SO_4~(2-)-S含量降低的深度,指示石灰土中存在SO_4~(2-)异化还原反应。石灰土较高pH值和较低的黏粒含量不利于SO_4~(2-)吸附,生物滞留后剩余SO_4~(2-)主要通过淋溶迁移出石灰土剖面。有机硫是石灰土中大气酸沉降输入SO_4~(2-)的主要硫滞留方式,在硫沉降输入通量显著降低后,石灰土中有机硫矿化在较长时期内可能导致大量SO_4~(2-)输入流域水体,与SO_4~(2-)淋溶输出有关的流域土壤和水体物理化学组成变化应予以关注。
[Abstract]:By means of continuous extraction of soil sulfur forms and microbiological analysis, the groups and quantities of total sulfur, total reducing sulfur, total reducing sulfur, organic sulfur and sulfate-reducing bacteria SRB in lime soil were analyzed. The purpose of this study was to elucidate the characteristics of sulphide accumulation and SRB distribution in soils of southwest acid deposition area. Organic sulfur is the main sulfur form, so _ 4 ~ (2)) is the main inorganic sulfur form. Leaf desulfurization bacteria and Vibrio desulphurization are detected in lime soil. The depth of increase of SRB and TRIS content corresponds to the depth of decrease of SO_4~(2-)-S content in lime soil profile. It is indicated that there is a dissimilatory reduction reaction in lime soil. The higher pH value and lower clay content of lime soil are not conducive to so _ 4N _ 2-adsorption. Organic sulfur is the main sulfur retention mode of atmospheric acid deposition and input so _ 4 ~ (4 ~ (+) ~ (2)) in lime soil, and when the sulfur deposition flux decreases significantly, the residual SO4D _ (2)) is transported out of the lime soil profile mainly by leaching, and organic sulfur is the main sulfur retention mode of atmospheric acid deposition in lime soil. The mineralization of organic sulfur in lime soil may lead to a large amount of so _ s _ 4N _ 2 ~ (2) input into the basin water body for a long time. The physical and chemical composition changes of the basin soil and water body related to the so _ 4 / C _ (2) leaching output should be paid attention to.
【作者单位】：贵州师范学院地理与旅游学院;中国科学院地球化学研究所环境地球化学国家重点实验室;中国科学院大学;
【基金】：国家自然科学基金(41463004,41573081) 贵州省自然科学基金(黔科合J字[2014]2135) 中国博士后基金(2015M572502)
【分类号】：S151.9

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