Long-term fire frequency variability in the eastern Canadian boreal forest: the influences of climate vs. local factors

被引:66
|
作者
Ali, Adam A. [1 ,2 ]
Carcaillet, Christopher [1 ,3 ]
Bergeron, Yves [2 ]
机构
[1] Univ Montpellier 2, Ctr Bioarcheol & Ecol, CNRS, UMR5059, F-34090 Montpellier, France
[2] Univ Quebec Abitibi Temiscamingue, Chaire Ind CRSNG UQAT UQAM Amenagement Forestier, Rouyn Noranda, PQ J9X 5E4, Canada
[3] Ecole Prat Hautes Etud, Inst Bot, Paleoenvironm & Chronoecol PALECO EPHE, F-34090 Montpellier, France
基金
加拿大自然科学与工程研究理事会;
关键词
bivariate Ripley's K-function; boreal ecosystem; climatic change; fire history; Holocene; kettle lakes; Neoglacial; Quebec; sedimentary charcoal; spatial fire pattern; CHARCOAL RECORDS; AGE CALIBRATION; DROUGHT CODE; FUTURE FIRE; COAST RANGE; HOLOCENE; QUEBEC; AREA; CIRCULATION; HISTORY;
D O I
10.1111/j.1365-2486.2009.01842.x
中图分类号
X176 [生物多样性保护];
学科分类号
090705 ;
摘要
The influence of climatic and local nonclimatic factors on the fire regime of the eastern Canadian boreal forest over the last 8000 years is investigated by examining charred particles preserved in four lacustrine deposits. Herein, we compare the distribution of fire-free intervals (FFIs) and the synchronicity of fire events among sites, using Ripley's K-function to determine the extent of the role of local-scale vs. large-scale processes with respect to fire control. Between 8000 and 5800 cal. bp (calibrated years before present) the climatic and ecological conditions were less conducive to fire events than after this date. After 5800 cal. bp, the number of fires per 1000 years (fire frequency) progressively increased, reaching a maximum ca. 3400 cal. bp. There was a sharp decrease in fire frequency during the last 800 years. Between 8000 and 4000 cal. bp, comparable FFIs and synchronous fire episodes were determined for the study sites. During this period, the fire frequency was predominantly controlled by climate. After 4000 cal. bp, two sites displayed independent fire histories (different FFI distributions or asynchronous fire events), underlining the important influence of local factors, including short-term fuel wetness, characteristics of the watershed and landscape connectivity, in determining fire occurrence. We conclude that climatic changes occurred during the last 4000 years that induced a rise in the water table; this may explain the high spatial heterogeneity in fire history. Current and projected global climatic changes may cause similar spatial variability in fire frequency.
引用
收藏
页码:1230 / 1241
页数:12
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