Trace Metal Content and Speciation, Water and Soil Chemistry, and Methane Production for a Wetland in Missouri (September 2015) and in Florida (January 2016)

Data is associated with a manuscript in preparation for submission to explore whether low trace metal availability inhibits methane production in freshwater wetland soils. Reported data are from two field sites, one in Missouri and the second in Florida (see location data). At each site, surface water compositions and properties and soil compositions are reported. Trace metal availability is assessed via sequential chemical extractions, Ni K-edge X-ray absorption near edge structure (XANES) spectroscopy, and X-ray microfluorescence imaging. Soil mineralogy is determined via powder X-ray diffraction. Multi-energy X-ray microfluorescence imaging as well as bulk and microscale S K-edge XANES spectra assess sulfur speciation in the soils. This package also reports data from trace metal amendment experiments, specifically methane (CH4) production versus time in soil incubations, the dissolved trace metal concentrations in these incubations, and the Ni K-edge XANES and extended X-ray absorption fine structure (EXAFS) spectra of soils to which increasing concentrations of Ni were added. A final version of this package will be published upon acceptance of the associated manuscript.

本数据集关联一篇待投稿的研究手稿，旨在探究淡水湿地土壤中低微量金属有效性是否会抑制甲烷生成。本次公开的数据源自两处野外采样点位，一处位于密苏里州，另一处位于佛罗里达州，采样点位的详细信息详见配套位置数据。两处采样点均报告了地表水的组成与理化性质，以及土壤的组成特征。微量金属有效性通过连续化学萃取法、镍（Ni）K边X射线吸收近边结构（X-ray absorption near edge structure, XANES）光谱，以及X射线微荧光成像进行表征。土壤矿物学特征通过粉末X射线衍射法测定。多能量X射线微荧光成像结合体相与微观尺度的硫（S）K边X射线吸收近边结构（XANES）光谱，用于解析土壤中的硫化学形态。本数据集包还包含微量金属外源添加实验的相关数据，具体包括土壤培养体系中甲烷（CH4）生成量随时间的变化、培养体系内的溶解态微量金属浓度，以及添加梯度浓度镍的土壤样品的镍K边XANES与扩展X射线吸收精细结构（extended X-ray absorption fine structure, EXAFS）光谱。本数据集包的最终正式版本将随关联手稿被期刊录用后正式发布。