Soil data for cores from a transect from the center of the BBC collapse scar into the surrounding burn

This data set contains soil data for cores from a transect from the center of the BBC collapse scar (0 m) into the surrounding burn (30 m). Thirty-five cores were collected soil cores along the transect in March 2003. We drilled cores using a gasoline powered, permafrost corer while soils were frozen. Two to four cores were drilled every 3 m along the transect, yielding a total of 35 cores. We stored cores frozen and cut sample sections using a radial saw. Cores were sampled at the interfaces between different soil layers. We classified soils using the Canadian Soil Classification system (Soil Classification Working Group 1998) identifying fibric, mesic, and humic organic horizions and the A and C mineral horizons. Nine cores were sampled only to the mineral boundary. We measured bulk density, %C and %N for all soil samples. The pH of sample was determined using litmus paper. We oven-dried at 50 - 65 degC and ground all samples before analysis. We analyzed samples for %C and %N using a Carlo Erba EA1108 CHNS analyzer (CE Instruments, Milan, Italy) and a COSTECH ECS 4010 CHNS-O analyzer (Costech Analytical Technologies Inc., Valencia, CA,USA). Sample standard errors were +/- 0.01% for nitrogen, +/- 0.45% for carbon. To indicate fire events in the surrounding ecosystem, charcoal layers in the cores were quantified. We estimated charcoal by emptying dried samples of a known volume and depth (on mean 4.5 cm3) over a 10 cm x 10 cm grid and counting macroscopic charcoal fragments (greater than 0.05 mm in diameter) in each cm grid cell.

本数据集包含沿样带采集的土壤岩芯数据，样带从BBC崩塌瘢痕中心（0米处）延伸至周边火烧区域（30米处）。2003年3月，我们沿该样带采集了35个土壤岩芯。采用汽油动力冻土取芯器，在土壤冻结状态下钻取岩芯：沿样带每3米钻取2至4个岩芯，最终共获得35个岩芯。我们将岩芯以冷冻状态保存，并使用径向锯切割样品段，在不同土壤层的界面处进行采样。我们采用加拿大土壤分类系统（土壤分类工作组，1998年）对土壤进行分类，识别出纤维质（fibric）、半腐殖质（mesic）和腐殖质（humic）有机土层，以及A、C矿质土层；其中9个岩芯仅采样至矿质土层边界。我们测定了所有土壤样品的容重、有机碳百分比（%C）与全氮百分比（%N），采用石蕊试纸测定样品pH值。分析前，我们将所有样品置于50至65℃烘箱中烘干并研磨；随后分别使用意大利米兰CE仪器公司的Carlo Erba EA1108 CHNS元素分析仪，以及美国加利福尼亚州巴伦西亚市Costech分析技术公司的COSTECH ECS 4010 CHNS-O元素分析仪，对样品的%C和%N进行分析。样品的标准误差为：氮±0.01%，碳±0.45%。为表征周边生态系统的火烧事件，我们对岩芯中的炭屑层进行了定量分析：将已知体积和深度（平均4.5 cm³）的烘干样品置于10 cm×10 cm的网格上，计数每个1 cm网格单元内的宏观炭屑碎片（直径大于0.05 mm），以此估算炭屑含量。