Soil physical and chemical properties, Megapit (DP1.00096.001)

The Soil physical and chemical properties, Megapit data product is available at each terrestrial site. The soil pit location was chosen to be representative of the sensor-based Soil Plots based on soil type, vegetation and topography, as well as being accessible by a backhoe and outside the main measurement zone of other sensors. The soil pit is usually within a few hundred meters of the sensor-based Soil Plots and NEON tower. Soil samples were collected by soil horizon up to 200 cm at non-permafrost sites (up to 300 cm at Alaskan sites). Laboratory analyses were conducted at the Kellogg Soil Survey Laboratory in Lincoln, Nebraska following the standard operating procedures outlined in the Soil Survey Laboratory Methods Manual, Report No. 42, Version 5, 2014. Instrumentation:

土壤理化性质巨型采样坑（Megapit）数据集产品可在所有陆地站点获取。该巨型采样坑的选址需匹配基于传感器的土壤样地的代表性要求，依据为土壤类型、植被与地形特征，同时应满足挖掘机可通行条件，且避开其他传感器的主要测量区域。该采样坑通常位于基于传感器的土壤样地及NEON塔台周边数百米范围内。在非永久冻土站点，土壤样本按土壤发生层采集至200厘米深度；阿拉斯加站点的采样深度可达300厘米。实验室分析工作在内布拉斯加州林肯市的凯洛格土壤调查实验室（Kellogg Soil Survey Laboratory）开展，严格遵循《土壤调查实验室方法手册》（第42号报告，第5版，2014年）中规定的标准操作流程。仪器设备：