Cartograms of point fine sand grades measured on the QSR, 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。该网络以代表法国土壤及其土地利用类型的2240个监测样点为基础，按照边长16公里的系统网格布设，覆盖法国全领土（含本土与海外领地）。这些样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、低人为干扰环境以及城市公园。每个样点的土壤物理、化学与生物学属性均以约15年为周期开展监测。上述分析工作同步配套土壤属性时空变异影响因子的调查，涵盖生物物理变量、污染源、土地利用历史及样点管理措施等内容。法国本土的首轮监测周期为2000年至2009年，此次以土壤污染为核心的监测工作，可绘制主要土壤参数（28项变量）的空间分布图，同时包含12种金属微量元素（Metal Trace Elements，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数据。本次监测中所有样点的采样方案、测试流程与观测记录，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： 本次生成的专题地图基于RMQS首轮监测（2000-2009）中2146个本土样点的分析结果，这些样点分布于2146个网格单元内。分析工作针对复合采样样品开展，采用两层采样方案：0~30 cm土层（耕作土壤的耕作层，称为表层复合样品或复合样1），以及下方直至50 cm的土层，称为亚表层复合样品或复合样2，样品取自采样地块。每份复合样品均由400平方米采样区内按照分层随机采样方案采集的25份单样混合制成（详细说明参见2006版《土壤质量测量网络手册》）。在森林或草地样点中，若有机发生层（对应土壤OF与OH发生层）厚度足够（至少1 cm）且在采样区内连续分布，则可采集第三层复合样品，取自该有机发生层。 本次专题地图为土壤质量测量网络（RMQS）首轮监测（2000-2009）中，各监测点所测得的目标参数实际含量（单位为每烘干土质量的测试单位浓度）的地理可视化表达。土壤分析工作由阿拉斯市法国国家农业科学研究院（INRA）土壤分析实验室在监测期间（2002年至2011年，随网络布设进度开展）完成；部分参数的分析为后续补测，使用储存在欧洲土壤馆藏馆的样品进行。 根据现行法律法规及我方的数据匿名化承诺，本次专题地图未使用采样点的实际坐标进行绘制。随专题地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。 与本数据集配套的元数据表（可通过下方链接获取）会针对每项展示参数，详细说明其分析方法、测试单位、检出限以及由LAS实验室提供的分析不确定度。