喀纳斯泰加林林火烈度分析

【目的】 在喀纳斯自然保护区泰加林中,寻找火干扰林分并设置样地进行火干扰调查,利用耐火树种西伯利亚落叶松(Larix sibirica Ledeb.)的火疤外。在属性因子量化喀纳斯自然保护区泰加林的林火烈度,可作为该自然保护区林火烈度划分的依据。【方法】 采用调查结合聚类分析,对喀纳斯自然保护区的林火烈度进行可量化划分等级。得到烈度各个等级的表征因子范围值。【结果】 喀纳斯自然保护区的林火烈度可量化为高、中、低3个等级,高烈度火烧样地占总数的37.4%;中度火烧的样地占总数30.7%,低烈度火烧占总数的31.8%。喀纳斯自然保护区火干扰史归属于1880~2000年的63个年份,1990以前的年份发生的林火烈度等级不均,1990年后发生自然火烧的次数减少,且以中、低等级的火干扰为主。【结论】 该保护区发生的自然火烧以高烈度和中度干扰为主;林火烈度受地形因子、火前林分组成和林火管理的影响。

Analysis of Fire Severity of Kanas Taiga

【Objective】 Natural fire disturbance surveys were conducted in Kanas Nature Reserve and the external attribute factors of fire scar in Larix sibirica Ledeb. were used to quantify the fire severity of natural fire disturbance of virgin forest in Kanas Nature Reserve.【Method】 Through field investigation combined with cluster analysis, the fire severity could be quantified into high-, moderate- and low-severity, and each level had its corresponding token factors range, which could be used as the basis for the classification of forest fire intensity in that Nature Reserve.【Result】 In Kanas taiga, plots of high-severity accounted for 37.4%; moderately burned plots accounted for 30.7% and low-severity accounted for 31.8%. The fire history could be attributed to 63 years in between 1880 and 2000. Fire severity levels were no equal before 1990. After 1990 the times of fire decreased and the fire severity was dominated by the moderate and low levels.【Conclusion】 Conclusions were that the natural fires in Kanas Nature Reserve were mainly dominated by the high- and moderate- fire severity. And the fire severity was affected by terrain factors, per-fire stands composition and forest fire management.