Chimney Meadow (Church Field) soil water retention measurements (pF curves)

Soil moisture and Electrical Resistivity Tomography (ERT) measurements within the top metre of soil at Church Field, Chimney Meadow National Nature Reserve. Church Field lies on a clay lens which overlies surrounding sand and gravel soils. Apart from the A and B horizons, the clay was found to be fairly homogenous down to the maximum depth of 1.1m of the access pit. On the 1:250,000 Soil Map of South East England the location falls into the soils category 832 Kelmscott Association which comprise mostly permeable fine loamy soils over limestone gravel and variably affected by groundwater and with some risk of flooding. However, on the more detailed 1:25,000 scale Sand and Gravel Resources Map of the Thames Valley the clay lens is depicted as Oxford Clay substrate without sand and gravel cover, surrounded by sand and gravel terraces cropping out at the surface.

烟囱草甸国家自然保护区（Chimney Meadow National Nature Reserve）教堂田（Church Field）表层1米土壤内的土壤湿度与电阻率层析成像（Electrical Resistivity Tomography, ERT）测量数据。教堂田位于一个黏土透镜体之上，该透镜体覆盖于周边的砂质与砾石土壤。除A层与B层土壤外，在探坑最大深度1.1米范围内，黏土被发现具有相当均质性。在1:250000比例尺的《英格兰东南部土壤图》中，该地点属于832号凯尔姆斯科特组合土壤类型，其主要由石灰岩砾石之上的渗透性细壤土构成，受地下水影响程度不一，且存在一定洪水风险。然而，在更详细的1:25000比例尺《泰晤士河谷砂与砾石资源图》中，该黏土透镜体被描绘为无砂砾覆盖的牛津黏土基质，周边环绕着出露于地表的砂质与砾石阶地。