云勇林场不同林业发展模式森林资源动态分析

Dynamic Analysis of Forest Resources in Different Forestry Development Modes in Yunyong Forest Farm

为探究佛山市云勇林场不同林业发展模式森林资源动态变化,采用1993、2001、2012、2018年云勇林场森林资源规划设计调查数据及期间连续25年林场主要森林资源培育、利用档案材料,采用Excel 2019软件进行统计及纵向对比分析。结果表明,Ⅰ~Ⅲ时期林业发展模式,随着时间的推延,林场的乔木林面积,森林覆盖率,生态公益林面积,一、二级生态功能等级林分面积比例,应用乡土树种种类数量及种植阔叶混交林面积不断增大。其中,生态公益林面积增幅最大的是Ⅰ模式时期,为75.1%,应用乡土树种种类数量最多及种植阔叶混交林面积最大的是Ⅱ模式时期,分别达134种和1429.0 hm^(2),而在Ⅲ模式时期,乔木林面积占比及森林覆盖率增幅最大,分别达11.63%和12.02%;一、二级生态功能等级林分面积比例最大,达92.62%,森林植物景观变化最丰富,斑块面积最趋均匀。森林总蓄积量及乔木林单位蓄积量均呈先降后升趋势,造林面积先升后降趋于“0”。随着Ⅰ~Ⅲ时期林业发展模式的转变,林场获取的木材资源数量越来越少,对森林的干扰不断减弱,生态景观功能不断增强,提供绿色公共生态服务产品越来越多。

In order to explore the dynamic development of forestry resources in different forestry development modes in Yunyong Forestry Farm of Foshan City,the data of forest inventory for planning and design of Yunyong Forest Farm in 1993,2001,2012 and 2018,and the archival materials of forest resource cultivation and utilization for 25 consecutive years were used for statistics and longitudinal comparative analysis by Excel 2019 software.The results showed that the arbor forest area,the forest coverage,the ecological public welfare forest area,the area proportion of stand in primary and secondary ecological function grades,the number of native tree species and the area of broad-leaved mixed forest increased with the time inⅠ~Ⅲforestry development modes.The largest increase in the area of ecological public welfare forest was in mode I,which was 75.1%.The largest number of native tree species and the largest area of planting broad-leaved mixed forest were in mode II,which reached 134 species and 1429.0 hm^(2) respectively.The proportion of arbor forest area and forest coverage increased the most in mode III,which reached 11.63%and 12.02%respectively.The proportion of stand area in the primary and secondary ecological function grades was the highest,up to 92.62%,with the most abundant changes of forest plant landscape and the most uniform patch area.The total volume and the unit volume of arbor forest decreased first and then increased,and the afforestation area increased first and then decreased to“0”.The interference to the forest was weakened,the ecological landscape function was strengthened,and more and more green public ecological service products were provided with I~III forestry development mode change.