Map of the Natural Fund on scale 1:250,000 of the Emilia-Romagna plain — Nichel [Ni]

Represents the distribution of the area in the subsoil (90-140 cm depth) of the nickel content in agricultural soils. This depth is considered representative of the natural background content (‘pedo-geochemical content’ according to ISO/DIS 19258, 2005). The cartographic units are represented by groups of polygons belonging to concentration classes. The factors that regulate the natural content of metals in soils are: origin of the sediment in which the soil was formed, weaving, and evolutionary degree. For nickel as well as for chromium, the dominant factor is the origin of the sediments that originate the soil. The map has an original approach in that it uses genetic-environmental interpretation for the assessment and geographical extension of the geochemical data, instead of the more traditional geostatistic analysis. The concentration values are obtained by the analytical method XRF (X-ray Fluorescence Spectrometry) in order to determine the total content.本数据集表征农业土壤亚表层（深度90~140cm）内镍含量的面积分布特征。该深度被视作自然背景含量的代表性深度，依据ISO/DIS 19258:2005标准，该含量亦被称为土壤地球化学含量（pedo-geochemical content）。制图单元由隶属于不同浓度等级的多边形群组所构成。调控土壤中金属自然含量的因素包括：成土沉积物的成因、土壤织构与演化程度。对于镍与铬元素而言，其主导影响因素为成土沉积物的成因。该地图采用了创新性研究思路：针对地球化学数据的评估与地理范围拓展，采用遗传-环境学解释方法，而非更为传统的地统计分析手段。浓度数值通过XRF（X射线荧光光谱法，X-ray Fluorescence Spectrometry）分析方法获取，以测定土壤中镍的全量含量。