Cartograms of point concentrations of total mercury 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）是一项国家级长期土壤质量评估与监测计划。该网络基于对2240个具有法国土壤及其利用方式代表性的监测点位的监测，按照边长16公里的系统网格，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、城市公园。各点位的土壤物理、化学与生物学性质每约15年测定一次。上述分析同步开展对土壤性质时空变异影响因素的研究，包括生物物理变量、污染源、土地利用历史与点位管理措施。法国本土的首轮监测工作于2000年至2009年间开展，本次监测以土壤污染为重点，成功绘制了28项核心土壤参数的空间分布图，同时涵盖了12种金属痕量元素（ETMs）的全量或分步提取态含量，以及70种持久性有机污染物的含量分布。本次监测中各点位的所有采样方案、测定流程与观测记录均在2006版《土壤质量测量网络手册》中有详细说明。 数据获取方式： 本次生成的空间分布图基于首轮RMQS监测（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。分析对象为从采样剖面采集的混合样品，采用两层采样方案：其一为0-30厘米耕层（耕作土壤的耕作层厚度，称为表层混合样或混合样1），其二为深度达50厘米的亚耕层，称为亚表层混合样或混合样2。每份混合样品由400平方米采样区内按照分层随机采样方案采集的25份单样混合制成（详见2006版RMQS手册）。对于森林或草地样点，若采样区的有机表层（对应土壤发生层OF与OH层）厚度足够（至少1厘米）且分布连续，则可增设第三层混合样采样，采集该有机表层样品。 本次空间分布图为首轮RMQS监测（2000-2009年）中，各监测点位所测得的目标参数实际含量（以烘干土质量计的单位浓度）的地理可视化表达。本次监测的土壤分析工作由阿拉斯市法国国家农业研究院（INRA）土壤分析实验室于2002年至2011年间开展，随监测网络布设进度同步进行；部分参数的分析则为后续补测，使用了存放在欧洲土壤馆藏库的样品。 根据现行法律法规及本项目的数据匿名化承诺，本次生成的空间分布图未使用采样点位的真实坐标。随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。 与本数据集配套的元数据表（可通过下方链接获取）详细列出了每个展示参数的分析方法、计量单位、检出限以及由LAS实验室提供的分析不确定度。