Cartograms of the exchangeable Calcium point contents measured on the 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（RMQS，Soil Quality Measurement Network）是一项国家级长期土壤质量评估与监测计划。 该网络基于2240个代表法国各类土壤及其利用方式的监测点位，按照16km边长的系统网格布设于法国全境（含本土与海外领地）。 监测点位覆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。 各点位的土壤物理、化学与生物学性质的监测周期约为15年。 上述分析配套开展了土壤性质时空变异影响因素的调查，涵盖生物物理变量、污染源、土地利用历史及田间管理措施等内容。 法国本土的首次监测周期为2000年至2009年。本次监测聚焦土壤污染状况，成功绘制了28项核心土壤参数的空间分布图，同时完成了12种金属痕量元素（ETMs，metal trace elements）的全量或部分提取态含量，以及70种持久性有机污染物的空间制图。本次监测期间各点位的所有采样方案、测量与观测细节均收录于2006年版《土壤质量测量网络手册》。 数据获取说明： 本次生成的专题分布图基于首次RMQS监测（2000-2009）期间完成的2146个本土点位的分析结果，这些点位分布于2146个网格单元中。 分析样本采用两层采样方式采集自采样区：0~30cm土层（即耕作土壤的耕作层，称为表层复合样或复合样1），以及下层至50cm的土层（称为亚表层复合样或复合样2）。每份复合样品由400㎡采样区内按照分层随机采样方案采集的25份单样混合制备而成（详细说明参见2006年版RMQS手册）。若森林或草地样地的有机土层（对应土壤OF与OH发生层）厚度不小于1cm且在采样区内连续分布，则可额外采集第三层复合样。 专题分布图是对首次RMQS监测（2000-2009）期间，土壤质量测量网络各点位实测参数含量（以风干土质量为基准的单位浓度）的地理可视化呈现。 本次监测期间的土壤分析工作由阿拉斯法国国家农业科学研究院（INRA）土壤分析实验室于2002年至2011年间完成，随监测网络布设推进开展；部分参数的分析则为后续对欧洲土壤库存储的样品开展的回溯分析。 根据现行法律法规框架及数据匿名化承诺，本次生成的专题分布图未采用采样点位的实际坐标。随专题分布图一同提供的数据集将包含网格单元中心点的坐标，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）详细列明了每项表征参数的分析方法、计量单位、检出限以及由LAS提供的分析相关不确定度。