松阳县生物防火林带布设初探

通过对松阳县2000-2010年森林火灾发生情况的分析,将松阳县划分为Ⅰ、Ⅱ、Ⅲ级森林火险区,在行政区划和森林火险等级区划的基础上,结合区域林中空地、防火公路和山脊线分布等主要影响因子,采用分区控制的方法,确定生物防火林带的空间布局:在Ⅰ、Ⅱ级森林火险区内布设规划生物防火林带,将整个防火林带网络分割成2 691个网格,网眼平均面积为34 hm2,其中Ⅰ级火险区有1909个网格,平均网眼面积为28 hm2,Ⅱ级火险区有782个网格,平均网眼面积为48 hm2;生物防火林带总长度为4 587.1 km,防火网络所形成的网络密度为50.1 m/hm2,防火林带设计宽度应不小于15 m,防火网络总面积占区域面积的7.5%。主要造林树种为木荷(Schima superba)、杨桐(Adinandra millettii)、杜英(Elaeocarpus sylvestris)、浙江红花油茶(Camellia Chekiang-oleosa)、杨梅(Myrica rubra)等。

Layout of Biological Fire Belt in Songyang County

Based on analysis on forest fire occurred from 2000 to 2010 in Songyang county,Zhejiang province,the county was divided into different grades of forest fire risk (Ⅰ,Ⅱ,Ⅲ) using clustering method.Combined with administrative division and forest fire risks,locations of gap in the forests,fire prevention road as well as ridge lines,layout of the biological forest belt was determined between gradeⅠand Ⅱ.The whole fire prevention belt was divided into 2 691 separate units of different sizes,with the average area of 34 ha.The average area of unit in gradeⅠreached 28 ha,while that in gradeⅡ48 ha.The total length of the biological fire belt was 4587.1km.The network accounted for 7.5% of the total area in the county,with network density of 50.1 m/ ha and width of no less than 15m.The major species for afforestation of the belt are Schima superba,Adinandra millettii,Elaeocarpus sylvestris,Camellia chekiang-oleosa and Myrica rubra.