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1.引言火灾对木材的损失能用多种方法测定。针叶树种一般常用估计活树冠烧焦程度来标定火灾造成的损害。一些研究指出,树冠烧焦程度同由火灾引起的树木死亡率密切相关(Herman, 1954, Methven, 1971; Dieterich, 1979; Bevins, 1980)。形成层的损害也与火灾后的死亡率有关,并与树皮的厚度成反比(Hare, 1965)。根据经验数据揭示的树冠烧焦程度/树木死亡率的相关关系,只对西部两种针叶树(美国黄松,Herman, 1954; Dieterich, 1979; 花旗
1. INTRODUCTION Fire damage to wood can be measured in a number of ways. Conifer species are commonly used to estimate the extent of live crown burns to mark the damage caused by the fire. Some studies indicate that the degree of burned canopy is closely related to the tree mortality caused by fire (Herman, 1954, Methven, 1971; Dieterich, 1979; Bevins, 1980). Formation damage is also related to post-fire mortality and inversely proportional to the thickness of the bark (Hare, 1965). According to the correlation between burned crown and tree mortality revealed by empirical data, only two conifers in the western China (Ponderosa, Herman, 1954; Dieterich, 1979; Citigroup