栽植密度对杉木木材干缩性能的影响

对两种不同栽植密度的杉木Cunninghamialanceolata木材密度和弦向、径向、体积全干干缩率进行了测定和分析．结果表明，木材密度随着栽植密度的增大而增大，且达到极显著水平；而木材弦向、径向和体积全干干缩率，则随着栽植密度的增大而减小；两种栽植密度的木材体积全干干缩率与基本密度呈负相关；木材干缩比与基本密度、栽植密度大的呈正相关，与栽植密度小的呈负相关．因此，适当增加栽植密度可以改善杉木木材的性质，但其影响规律仍需进一步研究．

Effect of Different Planting Density on the Wood Shrinkage Characteristics of Chinese Fir

The wood density and the rate of tangential.radial and total volume shrinkage of Cunninghamia lanceolata (Lamb. ) Hook. from two plots with different planting.density were determined and statistically analyzed. Results show that as the planting density increases the wood density also increases and the increase rate reaches 0. 001, a verysignificant level:the rate of total shrinkage at tangential direction,at radial direction and ofthe volume is lowered with the increasing of planting density; wood basic density is negatively correlated to the total volume shrinkage rate of two different planting densities;it ispositively correlated to shrinkage ratio with higher planting density,and negatively correlated with lower planting density. Resulting in an increase in wood density and a decreasein total shrinkage,higher planting density improves wood quality to a certain degree. Toobtain the correct affecting regularities of planting density upon wood properties,furtherdetailed studies are still needed.