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Title: Acoustic Evaluation of Thinning and Biosolid Fertilization Effects on Wood Quality of a Douglas-fir stand

Source: USDA Forest Service, Forest Products Laboratory, General Technical Report, FPL-GTR-239, 2015; pp. 365-377.

Author(s)Wang, Xiping; Ross, Robert J.; Verrill, Steve; Lowell, Eini; Barbour, Jamie

Publication Year: 2015  View PDF »

Category: General Technical Reports
Associated Research Project(s):   FPL-4714-1B  FPL-4851-1B

Abstract: In this study, we examined the potential of using a time-of-flight (TOF) acoustic wave method to evaluate thinning and biosolid fertilization effects on acoustic velocity of trees and modulus of elasticity (MOE) of structural lumber in a 76-year-old Douglas-fir (Pseudotsuga menziesii, (Mirb., Franco)) experimental stand. The stand consisted of four treatments: control, thinned, biosolid fertilized, and a combined thinned and fertilized treatment, each with three replicates on 0.08 hectare plots. Four trees were selected in each plot using a stratified random sample based on the plot quadratic mean diameter, resulting in a total sample of 48 trees ranging from 14.2- to 53.3-cm diameter at breast height (DBH). The sample trees were first nondestructively tested using a TOF-based acoustic measurement system to obtain acoustic velocity in trees. The sampled trees were then harvested, bucked into merchantable-length stems and then milllength logs that were sawn into lumber. Acoustic velocities of stems and logs and MOE of lumber were subsequently obtained. Our results indicated that biosolid fertilization had a statistically significant effect on acoustic velocities of trees, stems, and butt logs; thinning did not have a statistically significant effect on acoustic velocities; combining thinning with biosolids did not produce a change in acoustic velocity different from applying biosolids alone. These findings are consistent with the treatment effects that were reported on interannual ring specific gravity. At tree level, treatment had no significant effect on lumber stiffness.

Keywords: Acoustic velocity; biosolids; lumber; logs; trees; modulus of elasticity; thinning

Publication Review Process: Informally Refereed (Peer-Reviewed)

File size: 301 kb(s)

Date posted: 09/25/2015

This publication is also viewable on Treesearch:  view
RITS Product ID: 75515
Current FPL Scientists associated with this product (listed alphabetically)
Ross, Robert J.
Supervisory Research Gen. Engineer
Verrill, Steve P.
Mathematical Statistician
Wang, Xiping
Research Forest Products Technologist

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