GEMAS – Chemistry of Europe’s Agricultural soils, Single element maps, Sr - Strontium

GEMAS (Geochemical Mapping of Agricultural and Grazing Land Soil in Europe) is a cooperative project between the Geochemistry Expert Group of EuroGeoSurveys and Eurometeaux. In total, more than 60 international organisations and institutions worldwide were involved in the implementation of the project. During 2008 and 2009, a total of 2219 samples of agricultural (arable land soils, 0 – 20 cm, Ap samples) and 2127 samples of grazing land (pasture land soils, 0 – 10 cm, Gr samples) soil were collected at a density of 1 site/2 500 km² each from 33 European countries, covering an area of 5,600,000 km². All samples were analysed for 52 chemical elements after an aqua regia extraction, 41 by XRF (total), TC and TOC. In addition, the agricultural soil samples were analysed for 57 elements in a mobile metal ion (MMI®) extraction and Pb isotopes. All analytical results were subject to tight external quality control procedures. The GEMAS project thus provides for the first time fully harmonised data for element concentrations and bioavailability of the elements at the continental (European) scale. The downloadable files present the areal distribution of the element contents determined by different analytical methods in the shape of colour shaded contour maps with a classification in 7 and 72 levels each.GEMAS（欧洲农业与牧场土壤地球化学制图，Geochemical Mapping of Agricultural and Grazing Land Soil in Europe）是欧洲地质调查联盟（EuroGeoSurveys）地球化学专家组与欧洲金属协会（Eurometeaux）合作开展的项目。全球共有超过60家国际组织与科研机构参与了本项目的实施。2008年至2009年间，项目组从33个欧洲国家、总计560万平方千米的研究区域内，以每2500平方千米1个采样点的密度，采集了2219份农业土壤样品（耕地土壤，0~20cm，即Ap样品）与2127份牧场土壤样品（牧地土壤，0~10cm，即Gr样品）。所有样品经王水消解后，针对52种化学元素开展了检测，其中41种元素采用X射线荧光光谱法（X-ray Fluorescence，XRF）、总碳（Total Carbon，TC）及总有机碳（Total Organic Carbon，TOC）进行分析。此外，农业土壤样品还通过可移动金属离子（mobile metal ion，MMI®）萃取法针对57种元素以及铅同位素开展了分析。所有分析结果均严格遵循外部质量控制流程进行核验。因此，GEMAS项目首次在欧洲大陆尺度上，提供了元素浓度与元素生物有效性的完全标准化统一数据集。 可下载文件以彩色阴影等值线图的形式，展示了不同分析方法测得的元素含量空间分布，其中分类等级分别设置为7级与72级。