Soil temperature (DP1.00041.001)

When possible the soil plots were arranged in a transect with the first plot approximately 15-40 m from the tower in the expected dominant airshed. The middle of airshed was used as the transect vector and plot spacing was based on the distance required for surface soil temperature and moisture measurements to be spatially independent at the 1 hectare scale during site characterization (capped at approximately 40 m due to logistical constraints). Soil plots were microsited as necessary to avoid obstacles (e.g., boulders, streams, and paths) and more compact plot layouts were used at small sites. Soil temperature is measured at up to nine depths within each plot, with the mid-point of the shallowest sensors at approximately 2, 6, 16, and 26 cm. Depths for deeper sensors vary among sites and are based on megapit soil horizon data (NEON.DP1.00097) and depth to restrictive feature (see NEON.DOC.003146). Instrumentation: Thermometrics - Climate RTD 100-ohm Probe

条件允许时，土壤样地沿样带布设，首个样地距观测塔约15~40米，处于预期主导气团影响范围内。以气团影响区的中心作为样带延伸方向，样地间距依据场地特征调查期间，1公顷尺度下地表土壤温度与湿度测量实现空间独立所需的距离确定；受后勤条件限制，样地间距最大不超过约40米。必要时会微调土壤样地的布设位置，以避开巨石、溪流、步道等障碍物；小型场地则采用更为紧凑的样地布设方案。每个样地内最多可在9个不同深度处测量土壤温度，最浅传感器的安装中点分别位于约2、6、16和26厘米深度处。深部传感器的布设深度因场地而异，依据大型探坑土壤发生层数据（NEON.DP1.00097）以及限制性土层埋深确定（详见NEON.DOC.003146）。仪器配置：Thermometrics品牌Climate RTD 100欧姆测温探头。