风速对蒙古栎阔叶床层失水过程的影响  

Effects of wind speed on drying processes of fuelbeds composed of Mongolian oak broadleaves

作　　者：张俪斌 孙萍[1] 金森[1] ZHANG Li-bin SUN Ping JIN Sen(College of Forestry, Northeast Forestry University, Harbin 150040, China)

机构地区：[1]东北林业大学林学院,哈尔滨150040

出　　处：《应用生态学报》2016年第11期3463-3468,共6页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(31370656)资助~~

摘　　要：研究蒙古栎阔叶床层在近似恒温湿条件下不同风速时的失水过程,分析了风速对床层失水系数的影响.结果表明:风速对蒙古栎阔叶床层失水过程的影响与可燃物含水率有关.从较高含水率(>75%)到近平衡含水率的多个失水过程可划分为3个阶段:有风失水速率大于无风失水速率的初始阶段、有风失水速率小于无风失水速率的中间阶段、不同风速失水速率相近的结束阶段.风速的影响随床层含水率降低而下降.蒙古栎阔叶床层的失水系数受风速、密实度和两者交互作用的影响,其中,失水系数随风速以三次多项式近似单调增加.Water desorption processes of fuel beds with Mongolian oak broad-leaves were observed under conditions with various wind speeds but nearly constant air temperature and humidity. The effects of wind speed on drying coefficients of fuel beds with various moisture contents were ana- lyzed. Three phases of drying process, namely high initial moisture content （〉75%） of phase Ⅰ , transition state of phase Ⅱ , and equilibrium phase Ⅲ could be identified. During phaseⅠ , water loss rate under higher wind speed was higher than that under lower wind speed. Water loss rate under higher wind speed was lower than that under lower wind speed during phase Ⅱ. During phase m, water loss rates under different wind speeds were similar. The wind effects decreased with the decrease of fuel moisture. The drying coefficient of the Mongolian oak broad-leaves fuel beds was affected by wind speed and fuel bed compactness, and the interaction between these two factors. The coefficient increased with wind speed roughly in a monotonic cubic polynomial form.

关 键 词：风速 失水系数 含水率 可燃物 

分 类 号：S792.186[农业科学—林木遗传育种]