CCZO -- Soil Texture -- Calhoun CZO -- (2015-2016)

These are soil texture data (% sand/silt/clay) for samples collected May-July 2015 and December 2016 in References Areas 1, 4, and 7 during the installation of gas wells. Samples were obtained by coring to depths of 500 cm with a bucket auger. From 50-500 cm, sampling occurred at fixed intervals: 50-100, 100-150, 150-200, 200-250, 250-300, 300-350, 350-400, 400-450, and 450-500 cm. In the upper 50 cm, samples were taken at the following depths: 0-7.5 cm, 7.5-15 cm, 15-30 cm, and 30-50 cm. Extracted soil was mixed on a tarp and sub-sampled in the field. Individual samples were uniquely identified by Reference Area, Gas Well Number, and Depth. Samples were transported to Duke in plastic bags where they were opened and allowed to air-dry for a minimum of 2 weeks. After air-drying, samples were passed multiple times through a #10 sieve (2-mm mesh) to separate soil from > 2-mm fraction. Obtaining pre-sieve bulk soil mass, and post-sieve >2-mm mass, allowed >2-mm mass fraction to be estimated. The < 2-mm fraction was transferred to paper bags for oven-drying at 40C for 48-72 hours. Texture was measured on the oven-dry sample using a standard method based on gravitational sedimentation. The lab SOP is available upon request.

本数据集收录了2015年5月至7月以及2016年12月在参考区域1、4和7安装气井期间采集的土壤质地数据（百分比：沙/粉土/粘土）。样品通过桶式钻头钻探至500厘米深度。在50至500厘米范围内，样品以固定间隔进行采集：50-100厘米、100-150厘米、150-200厘米、200-250厘米、250-300厘米、300-350厘米、350-400厘米、400-450厘米和450-500厘米。在上部50厘米内，样品采集深度如下：0-7.5厘米、7.5-15厘米、15-30厘米和30-50厘米。提取的土壤在防雨布上混合，并在现场进行子样采集。每个样品通过参考区域、气井编号和深度进行唯一标识。样品被运送至杜克大学，并在塑料袋中打开，露天风干至少2周。风干后，样品多次通过10号筛（2毫米网孔）以分离土壤与大于2毫米的颗粒。获得筛前土壤总质量和筛后大于2毫米的质量，从而估算出大于2毫米的质量分数。小于2毫米的颗粒被转移到纸袋中，在40摄氏度的烤箱中烘干48至72小时。土壤质地是通过基于重力沉降的标准方法在烤箱干燥的样品上测定的。实验室标准操作流程（SOP）可根据要求提供。