Root biomass and chemistry, Megapit (DP1.10066.001)

This data product contains the quality-controlled, native sampling resolution data from NEON's belowground plant biomass stock and chemistry measurements from Megapits. Soil samples were collected at 10 cm depth increments to the first 100 cm below the surface, then 20 cm depth increments thereafter, along three vertical profiles from a single temporary soil pit at a location expected to be representative of NEON sensor-based soil plots. This sampling activity is expected to occur once at each NEON terrestrial site. Root material is sorted, dried, weighed, and analyzed, then any excess root sample material is archived in the NEON Biorepository and are available on request. For additional details, see the user guide, protocols, and science design listed in the Documentation section below. Products resulting from this sampling include root biomass by size class and live/dead status, as well as root chemistry and stable isotope ratios. A summary table of external lab precision and accuracy is included in the expanded package. Latency: Data were collected once, at the establishment of each site. Data were published within one year of collection, and future collections at existing sites are not expected.

本数据产品包含经质量控制、保留原生采样分辨率的国家生态观测网络（National Ecological Observatory Network, NEON）地下植物生物量储量及大型土壤坑（Megapits）化学测量数据。土壤样品以10厘米为间隔采集至地表下100厘米处，后续则以20厘米为间隔采集；采样沿单个临时土壤坑的三个垂直剖面开展，该点位预期可代表NEON基于传感器的土壤样地。该采样活动预期在每个NEON陆地样地仅开展一次。研究人员将对根系材料进行分选、干燥、称重与分析，剩余多余的根系样品将归档至NEON生物样本库（NEON Biorepository），可根据申请获取。如需了解更多细节，请参阅下文文档部分所列的用户指南、实验方案及科学设计方案。本次采样生成的产品包含按粒径分级及存活/死亡状态划分的根系生物量，以及根系化学组分与稳定同位素比值数据。扩展数据包中包含外部实验室精密度与准确度汇总表。数据发布延迟说明：数据于每个样地建站时采集一次，采集后一年内完成发布，现有样地后续不会再次开展采样。