Article Figures & Data
Figures
- Figure 1.
The barrier materials tested in this study were A) a tough nylon fabric, B) 16-mesh copper screen, and C) Biobarrier.
- Figure 2.
Nine-year-old hybrid cottonwood plantation at Pack Forest, near Eatonville, Washington.
- Figure 3.
Large root on 9-year-old hybrid cottonwood.
- Figure 4.
Treatment zones (shaded) and the 1- by 2- by 0.5-foot volumes in which roots were measured.
- Figure 5.
Dry weights of roots in soil volumes 0.5 foot beyond the 1- by 2-foot treatment zones for A) hybrid cottonwood, B) black cottonwood, and C) paper birch. Treatments were control (Con), nylon fabric (Fab), copper screen (Cu), and Biobarrier (Bio).
- Figure 6.
Cross-sectional area of three largest roots in soil volumes 0.5 foot beyond the 1- by 2-foot treatment zones for A) hybrid cottonwood, B) black cottonwood, and C) paper birch. Treatments were control (Con), nylon fabric (Fab), copper screen (Cu), and Biobarrier (Bio).
- Figure 7.
Root constricted by copper screen. Distance across constriction is approximately 1/16 inch.
- Figure 8.
Effects of soil organic matter and initial root abundance on amounts of roots getting through Biobarrier.
Tables
hybrid cottonwood black cottonwood birch Control 15 9 15 Nylon fabric 15 9 15 Copper screen 15 9 15 Biobarrier 15 9 15 Biobarrier at 2” 15 8 13 Biobarrier at 4” 15 8 13 - Table 1.
Diameters (inches) of the largest three roots coming through panels of barrier materials. (Values in each box are from the same tree.)
Species T reatment Control Fabric Copper Bio Bio 2” Bio 4” Hybrid cottonwood 1.012 .212 .225 .400 .175 .375 .838 .200 .212 .325 .175 .200 Black .750 .200 .175 .300 .162 .188 cottonwood .562 175 .265 .350 .162 .425 .525 .125 .225 .188 .162 .300 Paper .550 .125 .212 .150 .150 .225 birch .550 .088 .125 .000 .000 .000 .438 .075 .125 .000 .000 .000 .450 .075 .100 .000 .000 .000
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