Recent changes in the fire regime across the North American boreal region - Spatial and temporal patterns of burning across Canada and Alaska
Recent changes in the fire regime across the North American boreal region - Spatial and temporal patterns of burning across Canada and Alaska
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DOI：
10.1029/2006gl025677
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发表时间：
2006-05-03
影响因子：
5.2
通讯作者：
Turetsky, MR
中科院分区：
文献类型：
--
作者：
Kasischke, ES;Turetsky, MR
我们使用的历史记录，从1959年至1999年，探讨火灾制度的特点，在整个北美北部地区（NABR）的生态区尺度。在1960/70年代和1980/90年代之间，NABR火灾状况的变化的特点是年烧毁面积增加了一倍，由于更大的火灾事件（> 1，000 km（2）），更大的火灾年的频率增加了一倍以上。在同一时期，人类点燃的火灾所烧毁的总面积比例下降，而生长季节早期和晚期的燃烧比例增加。燃烧面积增加的趋势是一致的整个NABR生态区，虽然西部生态区经历了更大的火灾年相比，东部生态区的增加。各生态区的燃烧季节性模式各不相同。沿着气候变暖，林火特征的变化可能是未来NABR生态系统过程的重要驱动力。
We used historic records from 1959 - 99 to explore fire regime characteristics at ecozone scales across the entire North American boreal region (NABR). Shifts in the NABR fire regime between the 1960s/70s and the 1980s/90s were characterized by a doubling of annual burned area and more than a doubling of the frequency of larger fire years because of more large fire events (> 1,000 km(2)). The proportion of total burned area from human-ignited fires decreased over this same time period, while the proportion of burning during the early and late-growing-seasons increased. Trends in increased burned area were consistent across the NABR ecozones, though the western ecozones experienced greater increases in larger fire years compared to the eastern ecozones. Seasonal patterns of burning differed among ecozones. Along with the climate warming, changes in the fire regime characteristics may be an important driver of future ecosystem processes in the NABR.