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Volume and value recovery comparison of processor and conventional systems in pine stands of the U.S. South
International Journal of Forest Engineering ( IF 1.9 ) Pub Date : 2019-09-09 , DOI: 10.1080/14942119.2019.1663032
Patrick M. Grove 1 , Joseph L. Conrad, IV 2 , Joseph Dahlen 2
Affiliation  

ABSTRACT Some sawmills in the U.S. South have begun purchasing prime length sawtimber processed by processors instead of, or in addition to, tree-length sawtimber produced by pull-through delimbers and slasher saws. The goal of this study was to compare volume and stumpage value recovery of two variants of the whole-tree harvesting system: processor and conventional. The processor system used a processor on the landing to produce prime lengths while the conventional system used a loader, pull-through delimber, and slasher saw to produce tree-lengths. Four harvest sites were split, with half of each site harvested with a processor system and the other half by a conventional system. An optimal bucking program was written to estimate theoretical stumpage value for sampled trees under tree-length and prime length specifications. Tree-length specifications resulted in slightly higher theoretical value per tree, assuming mill specifications were followed exactly (p < 0.05). In practice, however, processor crews producing prime lengths recovered greater stumpage value than conventional crews producing tree-lengths. Actual stumpage value of trees produced by processor crews exceeded maximum simulated values by an average of 7%, whereas conventional crews exceeded simulated values by 1%. Variation in timber utilization per hectare was high, but processor crews recovered an additional 16 t ha−1 and 295 USD ha−1 relative to preharvest inventory estimates compared to conventional crews (p > 0.10). Adding processors to logging crews in the U.S. South is a viable option that may increase volume and value recovery, especially when mills demand close adherence to specifications.

中文翻译:

美国南部松林中处理器和传统系统的体积和价值回收比较

摘要 美国南部的一些锯木厂已开始购买由加工商加工的优质锯材,以替代或补充由穿插式去枝机和切割锯生产的树木长度的锯材。本研究的目的是比较整棵树采伐系统的两种变体:处理器和常规采伐系统的体积和立木价值恢复。处理器系统在平台上使用处理器来生产主要长度,而传统系统使用装载机、牵引式去枝机和切割锯来生产树木长度。四个收获点被分开,每个地点的一半用处理器系统收获,另一半用传统系统收获。编写了一个最佳屈曲程序来估计在树木长度和主要长度规格下采样树木的理论立柱值。假设严格遵循工厂规范(p < 0.05),树木长度规范导致每棵树的理论值略高。然而,在实践中,生产主要长度的加工人员比生产树木长度的传统工作人员恢复了更大的立木价值。处理人员生产的树木的实际立柱值平均超过最大模拟值 7%,而传统人员超过模拟值 1%。每公顷木材利用率的变化很大,但与传统工作人员相比,加工人员与收获前库存估计数相比,额外回收了 16 t ha-1 和 295 USD ha-1(p > 0.10)。为美国南部的伐木人员增加处理器是一个可行的选择,可以增加产量和价值回收,
更新日期:2019-09-09
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