西南樺家具的優(yōu)缺點

從樣地一和樣地二分別選取9年生西南樺(Betula alnoides)人工林木材各3株。沿樣木南北取向及樹高方向分別對其纖維長度、纖維寬度、纖維壁厚、纖維腔徑、纖維長寬比及壁腔比等纖維形態(tài)特征值進行系統(tǒng)的測定和分析。結(jié)果表明西南樺人工林木材纖維長度較長且分布范圍廣,纖維長寬比大,纖維壁腔比小于1,說明西南樺人工林木材適合紙漿造紙;在相同樣地內(nèi),西南樺人工林木材纖維長度、纖維寬度、雙壁厚徑向變異規(guī)律相似,即髓心處較小,沿髓心向外先逐漸增大,波動后趨于穩(wěn)定;不同樣地條件下,樣地二西南樺人工林木材纖維長度均值小于樣地一,而纖維寬度、腔徑、雙壁厚、長寬比和壁腔比等均值較樣地一大。兩樣地各纖維形態(tài)特征值徑向變異、軸向變異規(guī)律相差不大。不同樣地各纖維形態(tài)特征值均值的t檢驗結(jié)果表明,西南樺人工林木材纖維長度、纖維寬度、纖維腔徑在0.05水平上差異顯著,而纖維壁厚、長寬比和壁腔比差異不顯著,說明不同營林措施對人工林木材材性有一定影響。研究結(jié)果對西南樺人工林材質(zhì)改良和定向培育以及其人工林成熟材的使用等具有一定的參考。

In this paper,the related properties(long-term dimensional stability,adhesion strength,painting film adhering capacity,painting film wearing and consuming value and wood surface hardness) of two plantation-grown hardwoods(Betula alnoides and Castanopsis hystrix),compared with commonly used Quercus mongolia domestically,were investigated. The test on long-term dimensional stability is referred to the method established by New Zealand Forest Research Institute,test on adhesion strength is conducted according to the criteria ASTM D905-89,the test on painting film adhering capacity is referred to the criteria GB/T 1765-1999 and GB/T 1765-1999,and wood surface hardness is referred to JIS Z2117-1963.In the meantime,adhesion strength and painting film adhering capacity are assigned to the corresponding grades according to different criterion based on a series of experimental results. The results show as follows: the adhesion strength,painting film adhering capacity of B. alnoides,C. hystrix and Q. mongolia belong to excellent grade with similar long-term dimensional stability. The total of radial and tangential swelling coefficient of the three species are 0.064%,0.068% and 0.066%,respectively. With regard to painting film wearing and consuming value of the three species,the quality grades are good,middle and good in order. The surface hardness on different wood surfaces of three species is 11.0,7.7 and 13.0 MPa on radial surface,14.2,10.6 and 12.5 MPa on tangential surface,33.0,26.6 and 38.1 MPa on end surface,respectively.