FIRE HISTORY ON A DESERT MOUNTAIN-RANGE - RINCON MOUNTAIN WILDERNESS, ARIZONA, USA
FIRE HISTORY ON A DESERT MOUNTAIN-RANGE - RINCON MOUNTAIN WILDERNESS, ARIZONA, USA
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DOI：
10.1139/x90-208
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发表时间：
1990-10-01
影响因子：
2.2
通讯作者：
SWETNAM, TW
中科院分区：
文献类型：
--
作者：
BAISAN, CH;SWETNAM, TW
在美国亚利桑那州萨瓜罗国家纪念地林孔山（Rincon Mountain Wilderness） 2300米以上的针叶林和松林混交林中，利用现代火灾记录和从原木、树枝和树桩中收集的火灾痕迹材料，对火灾历史进行了重建和分析。对残余材料进行交叉年代测定，可以将五件事的年代确定为日历年。季节性火灾发生率的估计是针对较大的火灾编制的。结果表明，林火以大规模（50 ~ 200 ha）、早季（5 ~ 7月）地表火为主。云母山研究区1657 ~ 1893年的平均5年间隔期为6.1年，较大火灾的间隔期为1 ~ 13年。混合针叶林类型（1748 ~ 1886）的平均火灾间隔期为9.9年，变化范围为3 ~ 19年。用帕尔默干旱严重指数（PDSI）重建的树木年轮对1700 - 1900年间35个主要的5年进行了比较。火灾前2年7月平均PDSI高于平均值（湿润），而火灾年平均PDSI接近平均值。这一490年的火灾发生记录证明了高分辨率（年度和季节性）树木年轮分析在记录和解释过去火灾制度的时空模式方面的价值。
Modern fire records and fire-scarred remnant material collected from logs, snags, and stumps were used to reconstruct and analyze fire history in the mixed-conifer and pine forest above 2300 m within the Rincon Mountain Wilderness of Saguaro National Monument, Arizona, United states. Cross-dating of the remnant material allowed dating of fire events to the calendar year. Estimates of seasonal occurrence were compiled for larger fires. It was determined that the fire regime was dominated by large scale (> 200 ha), early-season (May-July) surface fires. The mean five interval over the Mica Mountain study area for the period 1657-1893 was 6.1 years with a range of 1-13 years for larger fires. The mean fire interval for the mixed-conifer forest type (1748-1886) was 9.9 years with a range of 3-19 years. Thirty-five major fire years between 1700 and 1900 were compared with a tree-ring reconstruction of the Palmer drought severity index (PDSI). Mean July PDSI for 2 years prior to fires was higher (wetter) than average, while mean fire year PDSI was near average. This 490-year record of fire occurrence demonstrates the value of high-resolution (annual and seasonal) tree-ring analyses for documenting and interpreting temporal and spatial patterns of past fire regimes.