伐区立木蓄积量估测方法比较及出材量估算  

Comparisons on estimation methods for stand volume and calculation of output volume in stump area

作　　者：葛晓雯[1] 王立海[1] 鲍震宇[1] 孙天用[1] 

机构地区：[1]东北林业大学工程技术学院,哈尔滨150040

出　　处：《林业科技开发》2014年第3期127-130,共4页China Forestry Science and Technology

基　　金：国家林业公益性行业科研专项项目(编号:200904022)

摘　　要：伐前调查是森林经营单位一项重要的基础性工作,为寻求一种简便、快速、高精度的伐前蓄积量估测方法,以广西斯道拉恩索林业有限公司(SEGX)的一个作业小班为例,把采伐机自动记录的带皮数据作为真值,采用样带实测法、样圆实测法、角规样地和每木检尺4种方法估测小班蓄积量,对比分析各方法的估测精度。结果表明:样带法、样圆法和每木检尺3种方法的估测精度均在90%以上,满足抽样控制的精度要求。每木检尺虽然精度最高,但工作量也最大,对于公司日常的伐前调查,建议使用样带或样圆实测法。角规样地的精度稍低,为87.2%,原因在于仪器自身缺口误差、样点位移、观测误差以及坡度等因素的影响。对于公司许多面积大、地势复杂的作业单元,样地调查不容易开展,仍建议按技术要求采用角规测量,这样会比样地调查效率更高。最后,利用销售数据算出材种出材量为170.3 m3,出材率高达88.3%,这是由于称质量消除了人为测量误差和木材堆放空隙的影响。Pre-harvesting inventory is an importantly basic work of forest management unit. In order to seek a simple, rapid and high-precision method for volume estimation during pre-harvesting inventory, this paper took an operational sub-com- partment of Guangxi Stora Enso Forestry Co. ,Ltd（SEGX） as a sample, and considered the harvester over-bark data as true value. Four measuring methods including Strip sampling, Circle sampling, Tally and Angle Gauge plot were respectively a- dopted to estimate the sub-compartment stand volume. The estimating precision of each method were analyzed by being compared with true value. The results showed that estimating precision of the method of Strip sample, Circle sample and Tally were all above 90% , satisfying the requirement of sampling precision. Though the precision of Tally was the highest, its workload was also the largest. A lower precision of Angle Gauge plot was 87.2% , which was mainly caused by many factors such as slot error of its own, sampling point displacement, observation error and gradient. For many operational u- nits with large area and complex terrain, however, it＇ s not easy for sample plot inventory. In this case, measuring by An- gle Gauge strictly according to the requirements of technology was still recommended in order that the higher inventory effi- ciency can be obtained. In the end, the output volume calculated on the basis of sale data was 170.3 m^3, and the outturn percentage reached up to 88.3%. This was because weighing sale eliminated the effects of measurement error and wood stack space.

关 键 词：立木蓄积量 样地调查 角规样地 每木检尺 出材量 

分 类 号：S757.21[农业科学—森林经理学]