Fire histories of mid-elevation mixed-conifer forests are uncommon in the eastern Cascades, limiting our understanding of long-term fire dynamics in these environments. The purpose of this study was to reconstruct the fire and vegetation history for a moist mid-elevation mixed-conifer site, and to determine whether Holocene fire activity in this watershed was intermediate to fire regimes observed at higher and lower elevations in the eastern Cascades. Fire activity and vegetation change was reconstructed using macroscopic charcoal and pollen analysis of sediment core from Long Lake. This site is located ~45 km west of Yakima, WA, and exists in a grand fir-dominated, mixed-conifer forest. Results show low fire activity from ca. 9870 to 6000 cal yr BP, after which time fire increased and remained frequent until ca. 500 cal yr BP. A woodland environment existed at the site in the early Holocene, with the modern coniferous forest establishing ca. 6000–5500 cal yr BP. A mixed-severity fire regime has existed at the site for the past ~6000 years, with both higher- and lower-severity fire episodes occurring on average every ~80–100 years. However, only one fire episode occurred in the Long Lake watershed during the past 500 years, and none within the past ~150 years. Based on a comparison with other eastern Cascade sites, Holocene fire regimes at Long Lake, particularly during the late Holocene, appear to be intermediate between those observed at higher- and lower elevation sites, both in terms of fire severity and frequency.

在喀斯喀特东部，中海拔混合针叶林的火灾历史并不常见，这限制了我们对这些环境中长期火灾动态的理解。这项研究的目的是重建一个湿润的中海拔混合针叶树遗址的火和植被历史，并确定该流域的全新世火活动是否属于在东部喀斯喀特山脉高海拔和低海拔观察到的火情之中。用宏观木炭和长湖沉积物芯的花粉分析重建了火活动和植被变化。该遗址位于华盛顿州亚基马市以西约45公里处，存在于一个以冷杉为主的混合针叶林中。结果表明，从 BP 9870至6000 cal yr年，此后，火势增加，并一直频繁发生，直到大约1989年。BP 500 cal yr。全新世初期该地区存在林地环境，现代针叶林建立了约2年的历史。BP 6000–5500 cal yr。在过去的大约6000年中，该场所存在着混合严重度的火灾情况，较高和较低度的火灾事件平均每80至100年发生一次。然而，在过去的500年中，长湖流域仅发生了一次火灾，而在过去的150年中没有发生。根据与其他东部喀斯喀特地区的比较，从火的严重性和发生频率上看，长湖的全新世火情，尤其是在全新世晚期，在高海拔和低海拔地区之间处于中等水平。在过去的大约6000年中，该场所存在着混合严重度的火灾情况，较高和较低度的火灾事件平均每80至100年发生一次。然而，在过去的500年中，长湖流域仅发生了一次火灾，而在过去的150年中没有发生。根据与其他东部喀斯喀特地区的比较，从火的严重性和发生频率上看，长湖的全新世火情，尤其是在全新世晚期，在高海拔和低海拔地区之间处于中等水平。在过去的约6000年中，该场所存在着混合严重度的火灾情况，平均而言，每〜80-100年发生一次高度和低度火灾。然而，在过去的500年中，长湖流域仅发生了一次火灾，而在过去的150年中没有发生。根据与其他东部喀斯喀特地区的比较，从火的严重性和发生频率上看，长湖的全新世火情，尤其是在全新世晚期，在高海拔和低海拔地区之间处于中等水平。