滇中地表死可燃物平衡含水率和时滞与温湿度的关系研究

The relationship between equilibrium moistu re content, time-lag of dead fuels and temperature and humidity in central Yunnan

为研究温湿度对滇中地表死可燃物平衡含水率和时滞的影响, 2017年4月于昆明西山公园采集云南松和滇青冈两个树种新凋落的枯枝和枯叶,利用恒温恒湿箱在室内测定了20个温湿度组合下的平衡含水率和时滞,并通过统计软件分析了平衡含水率和时滞与温湿度的关系,同时以Simard和Nelson模型为响应模型拟合了4种可燃物的平衡含水率预测模型,利用均方根误差分析比较两类模型的精准性。结果表明:滇中地表死可燃物平衡含水率和时滞受温湿度的影响显著,平衡含水率和时滞均随温度的升高而减小,随湿度的增加而增大。4种可燃物拟合得出的Simard模型和Nelson模型相比较, Simard模型的拟合效果更好,更适用于滇中地表死可燃物平衡含水率和时滞的预测。

Research the changes of equilibrium moisture content(EMC)and time-lag of surface dead fuels in Yunnan under different temperature and humidity.Dead branches and dead leaves of Pinus yunnanensis and Cyclobalanopsis glaucoides were collected on April 2017 in Kunming Xishan Park.The EMC and time-lag were measured at 20 combinations of temperature and humidity conditions.And the relationship between EMC and time-lag and temperature and humidity was analyzed by statistical software.Simard models and Nelson models were established and accuracy of the two models was compared by root mean square error(RMSE)analysis..The results showed that both temperature and humidity significantly affected EMC and time-lag.EMC and time-lag fell as the temperature rised and increased as the humidity rised.Simard models of four combustibles gave the better fit than Nelson models with small root mean square error.Simard models were more suitable for the prediction of EMC and time-lag of surface dead fuels in Yunnan.