LBA-ECO LC-14 Root Biomass and Phenology, km 67 Site, Para, Brazil: 2001

This data set contains biomass estimates for coarse roots measured on the forest floor and measurements of fine root growth down to 2-m depth at the km 67 Rainfall Exclusion Experiment site, Tapajos National Forest, Brazil. The study site was part of a rainfall exclusion experiment that was conducted from 1999-2006 to develop an understanding of the physical processes driving the observed soil water dynamics at the site.

All surface roots intersected along three 1000-m long x 1-m wide transects were identified to species, measured, and biomass calculated. The collections were made on January 26, 2001 during the experimental rain exclusion period.

The fine root growth was measured from 0.5-m to 2-m depth with a rhizotron. The rhizotron tubes were inserted into deep soil pits in the control and treatment plots. Average root growth measurements are provided by depth interval on a monthly basis from July 25, 2000 to December 14, 2003.
DATA QUALITY STATEMENT: The Data Center has determined that there are questions about the quality of the data reported in this data set. The data set has missing or incomplete data, metadata, or other documentation that diminishes the usability of the products.

KNOWN PROBLEMS: There are discrepancies with the documentation, collection dates reported and collection method for fine roots utilizing rhizotrons.

本数据集包含巴西塔帕约斯国家森林67公里降雨排除实验站地上层森林土壤中直径较粗的根系生物量估算值，以及直至2米深度细根生长的测量数据。研究地点系一项自1999年至2006年进行的降雨排除实验的一部分，旨在理解驱动该地点观测到的土壤水分动态变化的物理过程。所有沿三条各1000米长、1米宽的样带地表根系均被识别出物种、测量并计算其生物量。采集工作于2001年1月26日，在实验降雨排除期间完成。细根生长的测量采用根域透镜仪进行，该透镜仪管被插入至对照和处理地块的深土坑中。从2000年7月25日至2003年12月14日，以每月为单位，按深度区间提供平均根生长测量值。数据质量声明：数据中心已确定本数据集中报告的数据质量存在疑问。该数据集存在缺失或不完整的数据、元数据或其他文档，这些因素降低了数据产品的可用性。已知问题：在根域透镜仪使用过程中，关于细根采集的文档、采集日期和采集方法存在差异。