Cartograms of point concentrations of total manganese measured on RMQS, campaign 1 (2001-2009)

The Soil Quality Measurement Network (RMQS) is a national long-term soil quality assessment and monitoring program. This network is based on the monitoring of 2240 sites representative of French soils and their occupations, distributed throughout the French territory (metropole and overseas) according to a systematic grid of 16 km side. The sites cover various occupations (large crops, permanent meadows, forests, vineyards and orchards, low-anthropised environments, urban parks). The physical, chemical and biological properties of soils are measured at each site with a periodicity of about fifteen years. These analyses are associated with the investigation of factors explaining the spatial and temporal variability of soil properties (biophysical variables, sources of contamination, history of occupation and site management practices). The first tax year in metropolitan France took place from 2000 to 2009. This campaign, focused on soil contamination, made it possible to map the main soil parameters (28 variables) as well as the contents of 12 metal trace elements (ETMs) in total or partial extraction and 70 persistent organic pollutants. All the sampling protocols, measurements and observations made on each site during this campaign are detailed in the 2006 Soil Quality Measurement Network Manual. Obtaining the values: The cartograms produced are based on the results of analyses of 2146 metropolis sites, spread over 2146 cells, implemented during the first RMQS campaign (2000-2009). The analyses were carried out on composite samples taken from the tarere using 2 layers of sampling (0-30 cm or thickness of the layer worked in cultured soil called surface composite or composite 1 and the underlying layer up to 50 cm, called sub-surface composite or composite 2). Each composite sample was made from a mixture of 25 individual samples taken from a 400 m² sampling area according to a stratified random sampling plan (see description in the RMQS Manual, 2006). A third layer of sampling from composite samples could be formed in forest or grassland from the holorganic horizons (corresponding to the soil horizons OF and OH) when these horizons were sufficiently thick (at least 1 cm) and continuous on the sampling surface. The cartograms are a geographical representation of the actual contents (concentration in unit of measurement per mass of air dried soil) measured for the parameter quoted, at each point of the Network of Soil Quality Measurements (RMQS), during the first campaign (2000-2009). The soil analyses were carried out by the Laboratory for Soil Analysis of the INRA in Arras during the campaign, from 2002 to 2011, as the network was deployed, and for certain parameters, a posteriori, on the samples stored at the European Conservatory of Soils. The cartograms have not been created with the actual coordinates of the sampling devices, in accordance with the legal framework currently in force and to meet our commitment to anonymisation of data. The dataset provided together with these cartograms will include the coordinates of the center of the mesh, called centroid coordinates or theoretical coordinates. A metadata table associated with the dataset (accessible via the links below) details for each parameter represented, the method of analysis, the unit, the detection threshold and the analytical uncertainty associated with the analysis provided by the LAS.土壤质量测量网络（Soil Quality Measurement Network，缩写RMQS）是一项国家级长期土壤质量评估与监测项目。该网络基于对2240个代表法国土壤及其土地利用类型的监测点位布设，点位按照边长16km的系统网格分布于法国全境（包括本土与海外领地）。这些点位涵盖多种土地利用类型：大田作物、永久草地、森林、葡萄园与果园、低人为干扰环境以及城市公园。每个点位的土壤物理、化学与生物学性质均以约15年为周期开展监测。此类分析配套开展土壤性质时空变异影响因子的调查，包括生物物理变量、污染源、土地利用历史以及点位管理措施。法国本土首次监测周期为2000年至2009年，本次以土壤污染为核心的监测周期成功绘制了主要土壤参数（共28项变量）以及12种金属痕量元素（ETMs）的全量或部分浸提含量、70种持久性有机污染物的空间分布图。本次监测周期内各点位的所有采样方案、测定流程与观测记录均收录于2006年版《土壤质量测量网络手册》。 数据获取方式： 本次生成的专题地图基于首次RMQS监测周期（2000-2009年）中2146个本土点位的分析结果，这些点位分布于2146个网格单元内。分析样品为取自耕作层（tarere）的分层混合样：耕作土壤的耕作层（0~30cm，称为表层混合样或混合样1）以及其下直至50cm的亚表层土层（称为亚表层混合样或混合样2）。每份混合样由400㎡采样区内按照分层随机采样方案采集的25份单样混合制成（详细方案参见2006年版《土壤质量测量网络手册》）。在森林或草地生态系统中，若采样区的有机发生层（对应土壤的OF与OH层）厚度足够（至少1cm）且连续，则可采集第三层混合样，取自该有机发生层。 本次专题地图为首次RMQS监测周期（2000-2009年）内，土壤质量测量网络各点位所测得的目标参数实际含量（以烘干土质量计的浓度单位）的空间可视化表达。本次监测周期内（2002年至2011年，随网络布设进度推进）的土壤分析工作由位于阿拉斯的法国国家农业研究院（Institut National de la Recherche Agronomique，缩写INRA）土壤分析实验室完成；部分参数的分析则在后续采用了存储于欧洲土壤库的样品开展回溯分析。 根据现行法律法规框架以及我们对数据匿名化的承诺，本次专题地图未采用采样点位的真实坐标进行绘制。随专题地图一同提供的数据集将包含网格单元的中心点坐标，即质心坐标或理论坐标。 与数据集配套的元数据表（可通过下方链接获取）详细列出了每个表征参数的分析方法、计量单位、检出限以及由LAS提供的分析不确定度。