BOREAS TGB-12 SOIL CARBON DATA: NSA

The BOREAS TGB-12 team made measurements of soil carbon inventories, carbon concentration in soil gases, and rates of soil respiration at several sites to estimate the rates of carbon accumulation and turnover in each of the major vegetation types. TGB-12 data sets include soil properties at tower and selected auxiliary sites in the BOREAS NSA and data on the seasonal variations in the radiocarbon content of CO2 in the soil atmosphere at NSA tower sites. The sampling strategies for soils were designed to take advantage of local fire chronosequences, so that the accumulation of C in areas of moss regrowth could be determined. These data are used to calculate the inventory of C and N in moss and mineral soil layers at NSA sites and to determine the rates of input and turnover (using both accumulation since the last stand-killing fire and radiocarbon data). This data set includes physical parameters needed to determine carbon and nitrogen inventory in soils. The data were collected discontinuously from August 1993 to July 1996.

BOREAS TGB-12研究团队在多个站点开展了土壤碳储量（soil carbon inventories）、土壤气体碳浓度以及土壤呼吸速率（soil respiration rates）的测定工作，旨在估算各主要植被类型的碳积累与周转速率。TGB-12数据集涵盖BOREAS NSA区域内塔台站点与选定辅助站点的土壤属性数据，以及NSA塔台站点处土壤大气中CO₂的放射性碳（radiocarbon）含量季节变化数据。本次土壤采样策略依托当地火灾时间演替序列（fire chronosequences）设计，从而可明确苔藓再生区域的碳累积量。该数据集可用于计算NSA站点处苔藓层与矿质土壤层的碳、氮储量，并结合末次毁灭性林分火灾（stand-killing fire）以来的碳累积量与放射性碳数据，确定碳、氮的输入与周转速率。本数据集包含测定土壤碳、氮储量所需的物理参数。数据采集工作于1993年8月至1996年7月期间间断开展。