Tree regeneration after fire: Effects of burn severity, CPCRW vegetative cover analysis

This study examines the effects of burn severity on patterns of post-fire tree establishment in the boreal forest. We collected data from 5 separate field experiments examining seedling establishment across different severity levels in 4 burns in central Yukon Territory, Canada, and interior Alaska, USA. The experimental studies focus on the germination, survival, and growth responses of four common tree species, trembling aspen (Populus tremuloides), lodgepole pine (Pinus contorta), white spruce (Picea glauca) and black spruce (Picea mariana). Data on the soil organic layer (depth, moisture, bulk density, pH) were also collected at each site. This file contains visual cover estimates, by species, for 2000-2002 at the CPCRW site. Sample dates are: 4 August 2000 25 July 2001 16 July 2002 Values are percent cover in a 1x1m quadrat, where T=trace (<0.5%), out=outside quadrat but inside experimental plot. An additional line is included which give the full species names associated with the 6-letter codes used as column headers.本研究探讨了火烧烈度对北方森林火后树木定植格局的影响。我们从5项独立野外试验中采集数据，这些试验针对加拿大育空地区中部以及美国阿拉斯加州内陆的4处火烧样地，分析不同火烧烈度下的幼苗定植情况。本试验聚焦4种常见乔木物种的萌发、存活与生长响应，分别为美洲山杨（Populus tremuloides）、扭叶松（Pinus contorta）、白云杉（Picea glauca）和黑云杉（Picea mariana）。同时在每个样点采集了土壤有机层相关数据，包括厚度、含水率、容重及pH值。 本文件包含CPCRW样地2000-2002年按物种划分的目测植被盖度估算值。采样日期分别为：2000年8月4日、2001年7月25日、2002年7月16日。 数据为1米×1米样方内的盖度百分比，其中T表示微量盖度（<0.5%），out表示位于样方外但处于试验样地内部。文件中额外附带一行内容，用于说明作为列标题的6位字母代码所对应的完整物种名称。