黑龙江省林火规律研究Ⅱ.林火动态与格局影响因素的分析

本文对在大尺度 (5 0 0km2 以上 )上影响黑龙江省林火的因素及其影响途径进行了分析。结果表明 ,年林火次数 (人为火次数 )与林业人口正相关 ,林火面积与人口无关。干燥度的空间差异对林火燃烧率格局有正向影响。林火特征与气候因子之间没有线性关系。黑龙江省林火次数和面积对年均温和降水量的响应可归纳为旋转的单叶双曲面和双叶抛物面两种模式。林火特征的周期与年均温、年降水量的周期关系很大。黑龙江省森林类型对林火次数、面积的影响在省级区划尺度上不显著的。较高的管理水平显著减少林火。林火次数、面积与了望塔数量、消防车数量及通讯覆盖率等无线性关系

STUDY ON FOREST FIRE REGIME OF HEILONGJIANG PROVINCEⅡ.ANALYSIS ON FACTORS AFFECTING FIRE DYNAMICS AND DISTRIBUTIONS

Factors and their ways affecting forest fires in Heilongjiang Province were analyzed here at a scale larger than 500?km\ 2.The results indicated that the annual fire occurrence (anthropogenic fires) is direct proportional to populations engaging in forestry while the annual burned area is irrelevant to them.The spatial variance of drought index directly affects the spatial pattern of burning rates.Forest fire characters have no linear relationships with climatic factors.The response of fire occurrence and burned areas to annual averaged temperature and precipitation in the province can be concluded into two modes:one described by single leafed hyperboloid and another by dual leafed paraboloid.The cycles of forest fire characters are closely related to that of annual averaged temperature and precipitation.The effects of forest types on fire in the province are not significant.Better management significantly reduces forest fires.Fire occurrence and burned area have no linear relationships with number of fire outlooks,fire engines and communication network covers.