Web Map Service for topsoil properties from the Countryside Survey of Great Britain, 2007 using a generalized additive model

This web map service presents modelled estimates of soil pH, carbon concentration (g kg-1), nitrogen concentration (% dry weight soil) and invertebrate density (individuals m-2) at 1km2 resolution across Great Britain. A Generalized Additive Model approach was used with Countryside Survey soil data from 2007 and including climate, atmospheric deposition, habitat, soil and spatial predictors. The models are based on data from Countryside Survey sample locations across Great Britain and are representative of 0-8cm soil depth for invertebrates and 0-15 cm soil depth for other variables. The Countryside Survey looks at a range of physical, chemical and biological properties of the topsoil from a representative sample of habitats across the UK. Loss-on-ignition (LOI) was determined by combustion of 10g dry soil at 375 degrees Celsius for 16 hours; carbon concentration was estimated by multiplying LOI by a factor of 0.55. Soil N concentration was determined using a total elemental analyser. Soil pH was measured using 10g of field moist soil with 25ml de-ionised water giving a ratio of soil to water of 1:2.5 by weight. Soil invertebrates were extracted from cores using a dry Tullgren extraction method and enumerated by microscope

本网络地图服务展示了基于模型估算的英国各地土壤pH值、碳浓度（单位：克每千克干土壤）、氮浓度（单位：%干重土壤）和无脊椎动物密度（单位：每平方米个体数），其空间分辨率为1平方公里。本研究采用广义加性模型方法，结合2007年乡村调查土壤数据，并纳入气候、大气沉降、生境、土壤和空间预测因子。模型数据基于英国乡村调查样本点的数据，并代表0-8厘米土壤深度内的无脊椎动物和0-15厘米土壤深度内的其他变量。乡村调查通过选取英国各生境的代表样本，对表层土壤的物理、化学和生物特性进行了研究。通过将10克干土壤在375摄氏度下燃烧16小时，测定了燃烧损失（LOI）；碳浓度通过将LOI乘以0.55的系数进行估算。土壤氮浓度使用全元素分析仪测定。土壤pH值通过10克田间湿润土壤与25毫升去离子水的混合物，以土壤与水的重量比为1:2.5进行测量。土壤无脊椎动物通过干式Tullgren提取法从土芯中提取，并使用显微镜进行计数。