Data for: Mineral-nutrient relationships in African soils assessed using cluster analysis of X-ray powder diffraction patterns and compositional methods

The dataset contains soil X-ray powder diffraction (XRPD) data and associated soil properties for subsoil samples from the AfSIS Sentinel Site survey. As such it represents data from 60 Sentiel sites across sub-Saharan Africa, acconting for a wide range of agro-ecological environments. The 'xrd.zip' file contains the 935 soil XRPD patterns. Each XRPD file is in space separated ASCII format. The first column is 2theta (i.e. x-axis) and second column is the counts (i.e y axis). The 'clusters_and_properties.csv' contains the associated site and soil information for each XRPD measurement, including: -SSN: a unique identifier used to link the soil property and XRPD data -Sentinel_site: The name of the Sentinel site -Latitude: latitude in decimal degrees -Longitude: longitude in decimal degrees -xrpd_cluster: A numeric factor of 1 to 9 denoting the mineralogical cluster of the soil, defined from cluster analysis of the XRPD data -xrpd_cluster_subset: A logical column denoting whether the data are included in the subset clusters of the associated manuscript -pH: soil pH -TOC: Total organic carbon concentration (mg/kg) -K, Ca, Mn, Fe, Ni, Cu and Zn: Total element concentrations analysed by total X-ray fluorescence spectroscopy (mg/kg) -m3.B, m3.Mg, m3.K, m3.Ca, m3.Mn, m3.Fe, m3.Cu and m3.Zn: Extractable element concentrations determined via Mehlich 3 extraction (mg/kg)本数据集包含来自AfSIS哨兵站点调查的亚表层土壤样品的X射线粉末衍射（X-ray powder diffraction, XRPD）数据及其相关土壤属性信息。该数据集涵盖撒哈拉以南非洲地区60个哨兵站点的采样数据，覆盖了多样的农业生态环境。 `xrd.zip` 压缩包内存储有935组土壤XRPD图谱。每份XRPD数据采用空格分隔的ASCII格式存储，其中第一列为2θ（即X轴）数据，第二列为计数强度（即Y轴）数据。 `clusters_and_properties.csv` 文件包含每份XRPD测量对应的站点与土壤属性信息，具体字段如下： - SSN：用于关联土壤属性与XRPD数据的唯一标识符 - Sentinel_site：哨兵站点名称 - Latitude：以十进制度表示的纬度 - Longitude：以十进制度表示的经度 - xrpd_cluster：代表土壤矿物学聚类的1至9数值因子，基于XRPD数据的聚类分析定义 - xrpd_cluster_subset：逻辑型字段，用于标识该数据是否纳入对应研究手稿的聚类子集 - pH：土壤pH值 - TOC：总有机碳浓度（单位：mg/kg） - K、Ca、Mn、Fe、Ni、Cu及Zn：通过全X射线荧光光谱法分析得到的全量元素浓度（单位：mg/kg） - m3.B、m3.Mg、m3.K、m3.Ca、m3.Mn、m3.Fe、m3.Cu及m3.Zn：通过Mehlich 3浸提法测定的可提取态元素浓度（单位：mg/kg）