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首页> 外文期刊>Proceedings of the Arkansas Academy of Science >Timber Felling Time, Costs, and Productivity in Arkansas
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Timber Felling Time, Costs, and Productivity in Arkansas

机译：阿肯色州的木材砍伐时间，成本和生产率

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摘要

Sixteen stands were harvested by either clearcut, shelterwood, group selection, or single-tree selection methods. Harvest productivity was evaluated in four consecutive years (1991 through 1994). Three of the stands had uneven-aged structure, the other 13 were typical, mature, even-aged stands. Harvest intensity (proportion of basal area removed) ranged from 0.27 to 1.00. Logging contractors used one to three sawyers with production chain saws to fell trees on all 16 tracts. There was no statistical difference in production rate between sawyers on the same stand. Harvested sites were similar in slope, average diameter at breast height (DBH) and pre-harvest number of stems by two inch diameter class. Total felling time (including walk, acquire, fell, and limb-top times) was inversely related to harvesting intensity and directly related to stem DBH. Factors affecting total felling time (in decreasing order of importance) were DBH of harvested stems, intertree distance, and harvest intensity. Felling productivity (100 cubic feet/hour) was found to be highest under high intensity harvests of large trees and lowest under low intensity harvests of small trees. Productivity was more sensitive to stem diameter than harvest intensity. Felling cost was shown to have an inverse relationship with felling productivity.
机译：通过采伐，遮蔽木，群体选择或单树选择方法收获了16个林分。连续四年（1991年至1994年）对收成生产率进行了评估。其中三个展位具有不规则的年龄结构，其他13个是典型的，成熟的，年龄均匀的展位。收获强度（除去的基础面积比例）为0.27至1.00。伐木承包商用1-3个带生产链锯的锯木工在所有16个区域砍伐树木。同一摊位上锯工之间的生产率没有统计学差异。收获部位的坡度，胸高平均直径（DBH）和茎秆的收获前数量（两英寸直径）相似。总采伐时间（包括步行，采集，跌倒和肢体活动时间）与收获强度成反比，与茎DBH成正比。影响总砍伐时间（按重要性从高到低的顺序）的因素是收获茎的DBH，树间距离和收获强度。发现砍伐生产率（100立方英尺/小时）在大树高强度采伐时最高，而在小树低强度采伐时最低。生产力对茎直径比收获强度更敏感。砍伐成本显示出与生产率下降成反比关系。

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