Cartograms of point levels of total Molybdenum 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, RMQS）是一项国家级长期土壤质量评估与监测计划。该网络依托覆盖法国全境（本土与海外领地）的2240个代表性监测站点构建，站点布设遵循边长16公里的系统网格原则，能够代表法国各类土壤及其利用方式。监测站点涵盖多种土地利用类型：大田作物种植区、永久草地、森林、葡萄园与果园、低人类干扰环境以及城市公园。每个站点的土壤物理、化学与生物学性质的监测周期约为15年。相关分析配套开展土壤性质时空变异驱动因素的调查研究，涉及生物物理变量、污染源、土地利用历史与场地管理措施等。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、12种金属痕量元素（ETMs）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分布图。本次监测期间所有站点的采样方案、测量与观测工作，均在2006年版《土壤质量测量网络手册》中有详细记载。 数据获取： 本次生成的分布图基于首次RMQS监测（2000-2009）期间完成的2146个本土监测站点的分析结果，这些站点分布于2146个网格单元中。分析样品采用两层采样方式获取：耕作土壤的耕作层（0-30厘米，称为表层复合样或复合样1）以及其下直至50厘米的亚表层（称为亚表层复合样或复合样2），样品取自采样区域。每份复合样由400平方米采样区内按照分层随机采样方案采集的25份单个样品混合制成（详细说明参见2006年版RMQS手册）。若森林或草地的有机发生层（对应土壤OF与OH层）厚度达标（至少1厘米）且在采样区内连续分布，则可从该有机层采集第三层复合样。 土壤分布图是对首次RMQS监测（2000-2009）期间，土壤质量测量网络各站点测得的目标参数实际含量（以风干土质量计的单位浓度）的地理可视化呈现。本次监测期间的土壤分析工作由法国国家农业研究院（Institut National de la Recherche Agronomique, INRA）阿拉斯土壤分析实验室于2002年至2011年完成，随监测网络布设推进开展；部分参数的分析则为后续对存储于欧洲土壤馆藏的样品进行的回溯分析。 根据现行法律框架要求，同时为履行数据匿名化承诺，本次生成的分布图未采用采样点的实际坐标。随分布图一同提供的数据集将包含网格中心点的坐标，即质心坐标或理论坐标。 与该数据集配套的元数据表（可通过下方链接获取）针对每个展示参数，详细说明了分析方法、单位、检测限以及由LAS提供的分析相关不确定度。