Comparing the Prescribed Natural Fire Program With Presettlement Fires in the Selway-Bitterroot Wilderness
Comparing the Prescribed Natural Fire Program With Presettlement Fires in the Selway-Bitterroot Wilderness
复制标题
塞尔韦-比特鲁特荒野中规定的自然火灾计划与预先安置火灾的比较
DOI：
--
复制
发表时间：
1994
期刊：
影响因子：
--
通讯作者：
J. Menakis
中科院分区：
文献类型：
--
作者：
Jk Brown;S. Arno;S. Barrett;J. Menakis
在爱达荷州和蒙大拿州的Selway-Bitterroot荒野（SBW）的8个主要森林类型，最近的火灾（1979-1990年）的严重程度和范围进行了比较，与定居前火灾（1935年前）。确定了预安置火灾间隔，以估计燃烧面积。整个SBW的预安置年烧毁面积为4，290公顷，由林分替换火灾和4，310公顷的非致命林下火灾。使用地理信息系统绘制了所有近期火灾面积>4公顷的地图。燃烧面积由火灾严重程度等级确定：树冠、致命表面、非致命表面和无燃烧。年平均烧毁面积2,780公顷的林分更换和2,270公顷的林下火灾。在安置期间烧毁的面积是最近一段时间的1.7倍。在搬迁期间，林分置换和非致命林下火灾烧毁的面积分别是最近一段时间的1.5和1.9倍。
The severity and extent of recent fires (1979-1990) were compared with that of presettlement fires (pre-1935) by eight major forest types in the Selway-Bitterroot Wilderness (SBW) in Idaho and Montana. Presettlement fire intervals were determined for estimating area burned. Presettlement annual area burned for the entire SBW was 4,290 ha by stand replacement fire and 4,310 ha by nonlethal understory fire. All recent period fires>4 ha were mapped using a GIS system. Area burned was determined by the fire severity classes: crowning, lethal surface, nonlethal surface, and no burning. Annual area burned averaged 2,780 ha by stand replacement and 2,270 by understory fire. Area burned during presettlement was 1.7 times that during the recent period. During the presettlement period, area burned by stand replacement and nonlethal understory fire was 1.5 and 1.9 times greater respectively than during the recent period.