Cartograms of the exchangeable iron point content 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。该网络基于对代表法国各类土壤及其利用方式的2240个监测点的观测，这些监测点按照16千米边长的系统网格分布于法国全境（包括本土与海外领地）。这些监测点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、低人类干扰环境以及城市公园。 各监测点的土壤物理、化学与生物学特性均以约15年为周期开展测定。此类分析同时关联对土壤特性时空变异影响因素的探究，包括生物物理变量、污染源、土地利用历史与场地管理措施等。法国本土的首次调查周期为2000年至2009年。本次调查聚焦土壤污染状况，成功绘制了主要土壤参数（28项变量）的空间分布图，同时涵盖了12种全量或部分提取态金属微量元素（ETMs）的含量，以及70种持久性有机污染物的含量分布。本次调查中各监测点的所有采样方案、测量流程与观测记录均在2006年版《土壤质量测量网络手册》中予以详细说明。 数据获取方式： 本次生成的空间分布图基于首次RMQS调查（2000-2009年）中2146个本土监测点的分析结果，这些监测点分布于2146个网格单元内。分析样本为取自两层采样剖面的混合样：0~30厘米土层（耕作土壤的耕作层，称为表层混合样或混合样1），以及向下延伸至50厘米的下层土层，称为亚表层混合样或混合样2。每份混合样均由400平方米采样区内按照分层随机采样方案采集的25份单样混合而成（详细说明参见2006年版RMQS手册）。在森林或草地样点中，若采样区的有机表层（对应土壤OF与OH发生层）厚度足够（至少1厘米）且分布连续，则可采集第三层混合样，取自该有机表层。 本次生成的空间分布图为首次RMQS调查（2000-2009年）期间，土壤质量测量网络各监测点所测得的目标参数实际含量（单位为每风干土质量对应的测量单位浓度）的地理可视化表达。本次调查期间（2002年至2011年，随网络布设进度推进），土壤分析工作由阿拉斯市法国国家农业研究院（INRA）土壤分析实验室完成；部分参数的分析则在后续采用了存储于欧洲土壤馆藏馆的样本进行回溯分析。 根据现行法律法规框架以及我方的数据匿名化承诺，本次生成的空间分布图未采用采样点的真实坐标。随空间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）详细列出了每个表征参数的分析方法、测量单位、检测阈值以及由LAS提供的分析相关不确定度。