NOAA/WDS Paleoclimatology - Heyerdahl fire data from Paunsaugunt Plateau - IMPD USPSG001

Our objective is to provide site-specific fire and forest histories from Utah and eastern Nevada that can be used for land management or additional research. We systematically sampled fire scars and tree-recruitment dates across broad gradients in elevation and forest type at 13 sites in Utah and 1 in eastern Nevada to characterize spatial and temporal variation in historical fire regimes as well as forest structure and composition. We collected similar data non-systematically at five additional sites in Utah. These 19 sites include a broad range of forest types (from pinyon-juniper woodlands to spruce-fir forests) and fire regime types. In this report, we summarize local-scale spatial and temporal variation with site-specific details of historical fire regimes and forests that will be useful for local natural resource and fire management of the individual sites. For each site, we report topography, chronologies of fire and tree recruitment, and properties derived from those chronologies such as time-averaged fire regime parameters (mean fire interval and fire severity) and changes in forest composition and structure that have occurred since the late 1800s

本研究旨在提供犹他州（Utah）与内华达州东部各点位专属的火灾与森林历史数据，以供土地管理或后续研究使用。我们在犹他州13个点位及内华达州东部1个点位中，沿海拔与森林类型的广泛梯度系统采集火疤（fire scar）与树木更新（tree recruitment）年代数据，以刻画历史林火格局（fire regime）的时空变异特征与森林结构组成特征。另在犹他州其余5个点位以非系统方式采集了同类数据。上述19个点位涵盖了从矮松-桧灌丛（pinyon-juniper woodland）到云杉-冷杉林（spruce-fir forests）在内的多种森林类型，以及多样的林火格局类型。本报告结合各点位专属细节，总结了历史林火格局与森林的局地时空变异特征，可为各点位的本地自然资源管理与林火防控提供参考依据。针对每个点位，我们报告了其地形、火灾与树木更新年代序列（chronology），以及由这些序列推导得到的相关参数：包括时间平均林火格局参数（平均火间隔期（mean fire interval）与火烈度（fire severity）），以及自19世纪末以来森林组成与结构发生的变化。