Influence of landscape structure, topography, and forest type on spatial variation in historical fire regimes, Central Oregon, USA
Influence of landscape structure, topography, and forest type on spatial variation in historical fire regimes, Central Oregon, USA
复制标题
景观结构、地形和森林类型对美国俄勒冈州中部历史火情空间变化的影响
DOI：
10.1007/s10980-018-0656-6
复制
发表时间：
2018
影响因子：
5.2
通讯作者：
R. Loehman
中科院分区：
文献类型：
--
作者：
A. Merschel;E. Heyerdahl;T. Spies;R. Loehman
在西北内陆地区，由于对历史火灾制度中空间变化的模式和原因的认识不足，对经过世纪的火灾排除后恢复针叶混交林的争论受到阻碍。和森林类型在驱动空间变化的历史火灾制度在混合-俄勒冈州中部的针叶林。MethodsWe使用树木年轮重建多世纪火灾和森林的历史，在105个样地超过10,393公顷。我们将火制度分为四种类型，并评估它们是否与地形，位置的燃料有限的浮石盆地，抑制火灾蔓延，并更新分类的森林type.ResultsWe确定了四个火制度类型和六个森林类型。虽然地表火灾频繁发生，而且往往范围广泛，但在所有四种类型中，严重火灾都很罕见。火制度不同的地形（海拔）的某些方面，但不是其他（坡度或方面），并与浮石盆地的分布。火制度没有严格的共变与混合针叶林types.ConclusionsOur工作揭示了持续的影响景观结构的空间变化在历史上的火制度，可以帮助通知讨论适当恢复火排除森林在内陆西北。如果目标是在景观尺度上恢复历史火灾状况，管理人员可能需要考虑地形和植被斑块类型的影响，这些类型可能会影响火灾蔓延和着火频率。
ContextIn the interior Northwest, debate over restoring mixed-conifer forests after a century of fire exclusion is hampered by poor understanding of the pattern and causes of spatial variation in historical fire regimes.ObjectivesTo identify the roles of topography, landscape structure, and forest type in driving spatial variation in historical fire regimes in mixed-conifer forests of central Oregon.MethodsWe used tree rings to reconstruct multicentury fire and forest histories at 105 plots over 10,393 ha. We classified fire regimes into four types and assessed whether they varied with topography, the location of fuel-limited pumice basins that inhibit fire spread, and an updated classification of forest type.ResultsWe identified four fire-regime types and six forest types. Although surface fires were frequent and often extensive, severe fires were rare in all four types. Fire regimes varied with some aspects of topography (elevation), but not others (slope or aspect) and with the distribution of pumice basins. Fire regimes did not strictly co-vary with mixed-conifer forest types.ConclusionsOur work reveals the persistent influence of landscape structure on spatial variation in historical fire regimes and can help inform discussions about appropriate restoration of fire-excluded forests in the interior Northwest. Where the goal is to restore historical fire regimes at landscape scales, managers may want to consider the influence of topoedaphic and vegetation patch types that could affect fire spread and ignition frequency.