天宝岩长苞铁杉林倒木的燃烧性研究

Combustibility of Fallen Logs in Tsuga longibracteata Forest in Tianbaoyan National Nature Reserve

以天宝岩长苞铁杉林内倒木为研究对象,结合以负荷量和含水率为自变量的综合燃烧属性及以灰分、热值、含水率及氮含量等理化性质为评价指标的燃烧熵值,综合探讨长苞铁杉林内倒木的燃烧性。结果表明,天宝岩长苞铁杉林内倒木属于低燃烧性可燃物,其发生火灾的可能性较小;长苞铁杉+糙花少穗竹混交林内倒木的燃烧性最低,非防火期长苞铁杉+毛竹混交林内倒木的燃烧性最大;倒木负荷量、综合燃烧属性值及发生火灾的可能性随腐烂等级升高而降低,平均含水率随腐烂等级增加而升高,燃烧性熵值随腐烂等级升高而降低。

Based on the fallen logs in Tsuga longibracteata forest in Tianbaoyan National Nature Reserve, this paper investigated the combustibility of fallen logs by analyzing the integrated attribute and burnable entropy, and the integrated attribute was done with the independent variable of fuel load and fuel moisture, burnable entropy was measured with the evaluation index of ash, moisture, caloric value and N content. The results showed that fallen logs in this area were low combustibility, and had lower ignition potential; logs in Tsuga longibracteata＋ Oligostachyum scabrifl^rum forest were the lowest combustibility, non-fireproof with the highest combustibility in Tsuga longibracteata＋Phyllostachys edulis forest; logs load, burnable logs Index and ignition potential were declined while average moisture increased with the increased of decay class, burnable entropy were decreased with the increased of decay class.