Effects of Crown Attr ibutes onWood Character isticsand Increments of Popu lus ×xiaohe i

WANG Xiao-qing; LIU Xing-e; REN Hai-qing

Effects of crown attributes on wood characteristics of Populus xiaohei were studied . The results indicatedthat effects of crown attributes on basic density were not significant. ForMOE and comp ression strength parallel tograin, the effects were significant, while insignificant for MOR. Crown attributes exerted little impacts on fiberlength, fiberwidth and the ratio of fiber length to width. Effects of crown attributes on sapwood and heartwood areaat breast height were highly significant. MOE, MOR, and comp ression strength parallel to grain were found to benegatively correlated with both crown width and length. In addition, the linear regression model fitted the relationship between comp ression strength parallel to grain and crown width fairlywell, with R2 value of 0. 62. Fiber lengthand width, to a certain extent, were positively related to crown size. Sapwood and heartwood area were highly, positively related to crown size. Furthermore, a close linear relationship was found between sapwood area and crownwidth, with R2 value of 0. 78; while a second order polynomial equation were best in describing the relationship ofheartwood area with crown width, with R2 value of 0. 91.

1. Research Institute ofWood Industry, CAF, Beijing　100091, China

Received Date: 2006-09-08

Abstract: Effects of crown attributes on wood characteristics of Populus xiaohei were studied . The results indicatedthat effects of crown attributes on basic density were not significant. ForMOE and comp ression strength parallel tograin, the effects were significant, while insignificant for MOR. Crown attributes exerted little impacts on fiberlength, fiberwidth and the ratio of fiber length to width. Effects of crown attributes on sapwood and heartwood areaat breast height were highly significant. MOE, MOR, and comp ression strength parallel to grain were found to benegatively correlated with both crown width and length. In addition, the linear regression model fitted the relationship between comp ression strength parallel to grain and crown width fairlywell, with R2 value of 0. 62. Fiber lengthand width, to a certain extent, were positively related to crown size. Sapwood and heartwood area were highly, positively related to crown size. Furthermore, a close linear relationship was found between sapwood area and crownwidth, with R2 value of 0. 78; while a second order polynomial equation were best in describing the relationship ofheartwood area with crown width, with R2 value of 0. 91.

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Effects of Crown Attr ibutes onWood Character isticsand Increments of Popu lus ×xiaohe i

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References

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