Aspirated pits in wetwood and micromorphology of microbial degradation in subalpine fir |
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Authors: | Yaoli Zhang Liping Cai Yongji Xu |
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Institution: | (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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Translated from Journal of Nanjing Forestry University (National Science Edition), 2006, 30(1): 53–56 译自: 南京林业大学学报 (自然科学版), 2006, 30(1): 53–56] |
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Keywords: | subalpine fir wetwood bacteria pit membranes the proportions of aspirated pits |
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