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Aspirated pits in wetwood and micromorphology of microbial degradation in subalpine fir |
| ZHANG Yaoli1, XU Yongji1, CAI Liping2 |
| 1.College of Wood Science and Technology, Nanjing Forestry University, Nanjing 210037, China; 2.Forintek Canada Corp., 2665 East Mall, Vancouver, B.C. Canada V6T 1W5; |
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Abstract Differentiating from normal wood, pit membranes in wetwood of subalpine fir contain bacteria of water drop shape or orbicular shape, and flaky shape, as observed using Scanning Electronic Microscope. Not only are ray parenchyma cells in wetwood partially degraded but also margo strands in pit membranes are somewhat degraded by bacterial activities. Most of the bordered-pit membranes in normal wood are unaspirated in green conditions and the proportions of aspirated pits in earlywood and latewood account for only 6.8% and 13.4%, respectively. Nevertheless, most of the bordered-pit membranes in wetwood are aspirated in green conditions and the proportions of aspirated pits account for 77.7% and 72.1%, respectively. The problem of hard-to-dry for subalpine fir could be reasoned from the considerable amount of aspirated pit membranes in wetwood.
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Issue Date: 05 December 2006
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