湿地松木材管胞长度微纤丝角的变异及其相关性分析(英文)

VARIATION OF TRACHEID LENGTH AND MICROFIBRIL ANGLE AND THEIR RELATIONSHIP OF SLASH PINE GROWN IN DIFFERENT SITES*

研究了３个不同立地条件上１５株１７年生湿地松木材管胞长度、微纤丝角的变异及二性状间的相关性。结果表明立地指数对管胞长度、微纤丝角有着较大的影响。株内径向管胞长度由髓心向外递增，纤丝角递减，二性状间呈显著的线性负相关。３个立地条件林分内株间二性状不存在这种显著的线性负相关，林分间二性状相关分析也不显著。这意味着材质改良中管胞长度不能预测纤丝角大小，即选择管胞长度这一性状难以控制纤丝角的变异。因此林木改良中优良种源或无性系鉴定和评价营林措施对木材性质影响时只能实测木材纤丝角。

Fifteen trees of 17yearold slash pine growing in three different sites were collected. Variations of tracheid length (TL) and microfibril angle (MFA) in secondary layers of tracheid wall,as well as the relationship between TL and MFA were studied. Site index had great effects on MFA and TL. In radial direction TL increased from pith outward and MFA decreased, and both were linearly, negatively and significantly related to each other in radial direction within trees. But this relationship was not found between trees within each stand on three different sites, and neither was the result found between trees among stands of three different sites. This meant that MFA is not able to be predicted by TL, i.e., it is difficult to control variation of MFA(by selecting TL in wood improvement). Therefore if better provenances or better clones in tree improvement are selected for further accreditatien and effects of forest practices on wood properties are evaluated, it can only determine the MFA o