Map charts of total Nickel point grades 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。该网络依托代表法国各类土壤及其土地利用方式的2240个监测站点构建，按照边长16 km的系统网格布设，覆盖法国全境（本土及海外领地）。站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、城市公园。各站点均对土壤的物理、化学与生物学特性开展监测，监测周期约为15年。相关分析同步开展影响土壤特性时空变异性的因素调查，包括生物物理变量、污染源、土地利用历史与站点管理措施。法国本土的首个监测周期为2000年至2009年。此次以土壤污染为核心的监测行动，首次绘制了28项主要土壤参数的空间分布图，以及12种金属痕量元素（Trace Metal Elements，ETMs）的全量或部分浸提含量、70种持久性有机污染物的空间分布数据。本次监测期间在各站点实施的所有采样方案、测量与观测工作，均在2006年版《土壤质量测量网络手册》中进行了详细说明。 数据获取方式： 本次生成的专题地图基于首个RMQS监测周期（2000-2009年）布设的2146个本土站点的分析结果，这些站点分布于2146个网格单元中。分析工作针对采集的复合样品开展，采样分为两层：耕作土壤的耕作层（0~30 cm，称为表层复合样品或复合样1）及其下伏至50 cm的土层（称为亚表层复合样品或复合样2）。每个复合样品由400 m²采样区内按照分层随机采样方案采集的25个单个样品混合而成（详细说明参见2006年版《土壤质量测量网络手册》）。若森林或草地的全有机发生层（对应土壤发生层OF与OH）厚度足够（至少1 cm）且在采样区域内连续，则可从该层采集第三层复合样品。 专题地图是对首个监测周期（2000-2009年）内，土壤质量测量网络各站点实测参数的实际含量（以风干土质量为单位的浓度值）的地理可视化表达。本次监测期间（2002年至2011年，随网络布设进度），土壤分析工作由阿拉斯INRA土壤分析实验室完成；部分参数的分析则为后续对欧洲土壤标本库存储的样品开展的回溯性分析。 根据现行法律框架要求，并为履行数据匿名化承诺，本次生成的专题地图未采用采样点的实际坐标。随专题地图一同提供的数据集将包含网格单元中心的坐标，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）详细说明了每个表征参数的分析方法、单位、检测阈值以及由LAS提供的分析不确定度。