辽东桤木阻火林带下灌木种群动态性研究

Dynamic Changes of Shrubs under Fire Control Belt of Alnus tinctoria

为了评价辽东桤木(Alnus tinctoria Sarg.)防火林带的作用,采用固定标准地法调查辽东桤木阻火林带下灌木种类、种群动态以及与坡向、坡位的关系,采用称量法测定灌木负荷量,结果表明:辽东桤木随着林龄的增长,其林带内的灌木植物种类和个体种群数量均呈逐渐减少趋势,一些灌木种类后期逐渐在林带内消失,20a生辽东桤木林带下仅有6种灌木分布;辽东桤木林带内灌木植物种类是东坡种类少于西坡,坡上位分布种类最少,仅有4种灌木分布,坡中位和下坡位无区别;林带下地表灌木可燃物负荷量随着林龄的增长而下降,20a生林下负荷量仅54g.m-2。

To evaluate the role of fire control belt of Alnus tinctoria,the method of sample-plot was adopted to survey shrub species,population dynamics and relationships of aspect,slope site under fire control belt of Alnus tinctoria,and to determine fuel-loading of shrubs with weighing.The result showed that along with growth of forest age,the shrubs species and individual population quantity overall appeared a reduced tendency;The shrubs aspect was influential to distributes of shrubs,species and population quantity of east slope were less than west slope.The shrubs species of up slope were less than the middling and low slope.Under the forest belt,the shrubs load weights was gradually decreasing along with growth of forest age.Alnus tinctoria stands in 20 age later were compared with several kinds other contrasting forest types,the fule-loading was minimum（54g·m-2）.