Root biomass and chemistry, periodic (DP1.10067.001)

This data product contains the quality-controlled, native sampling resolution data from NEON's belowground biomass protocol. These data enable estimation of the amount of belowground plant biomass <= 10 mm diameter within the area surrounding the NEON eddy covariance tower. At many sites this will also be the dominant vegetation type(s). Samples are collected once every five years. Whenever possible, NEON uses a 3-inch outside diameter (6.65 cm inside diameter) soil corer for belowground biomass sampling, with samples cored to 30 cm depth in order to be consistent with the sampling depth used for soil biogeochemistry and microbe sampling. All roots are sorted into three size category bins: <1 mm, 1-2 mm, and 2-10 mm. After sorting, root material is dried, weighed, and analyzed, then any excess root material is archived in the NEON Biorepository and available upon 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 as well as root chemistry and stable isotope ratios. A summary table of analytical lab precision and accuracy is included in the expanded package. Latency: The expected time from data and/or sample collection in the field to data publication is as follows, for each of the data tables (in days) in the downloaded data package. See the Data Product User Guide for more information. bbc_chemistryPooling: 90 bbc_dilution: 90 bbc_percore: 28 bbc_rootmass: 90 bbc_rootChemistry: 270 bgc\_CNiso\_externalSummary: 30本数据产品包含经质量管控的原生采样分辨率数据，源自美国国家生态观测站网络（National Ecological Observatory Network, NEON）的地下生物量采样规程。这些数据可用于估算NEON涡度协方差塔周边区域内直径≤10毫米的地下植物生物量。在多数观测站点，该区域的优势植被正是此类直径≤10毫米的地下植物类群。采样频率为每五年一次。在条件允许的情况下，NEON采用外径3英寸（内径6.65厘米）的土壤采样钻开展地下生物量采样，采样深度统一设定为30厘米，以与土壤生物地球化学及微生物采样的深度保持一致。所有根系将被划分为三个粒径分级：<1毫米、1-2毫米及2-10毫米。分选完成后，研究人员将对根系样品进行干燥、称重与分析，剩余的多余根系样品将归档存入NEON生物样本库（NEON Biorepository），可根据申请调取使用。如需了解更多细节，请参阅下文文档章节中列出的用户指南、采样规程及科学设计方案。本次采样生成的数据产品包括按粒径分级统计的根系生物量数据，以及根系化学组成与稳定同位素比值数据。扩展数据包中包含分析实验室的精密度与准确度汇总表。发布延迟：下载的数据包中各数据表从野外数据和/或样品采集到正式发布的预期时长（单位：天）如下所示，如需了解更多信息，请参阅《数据产品用户指南》。各数据表延迟时长分别为：bbc_chemistryPooling：90天；bbc_dilution：90天；bbc_percore：28天；bbc_rootmass：90天；bbc_rootChemistry：270天；bgc_CNiso_externalSummary：30天。