纯林和混交林中拟赤杨材性的比较分析

对拟赤杨（Alniphyllum fortunei Makino）纯林、拟赤杨-马尾松（Pinus massoniana Lamb．）混交林和拟赤杨-杉木Cunninghamia lanceolata（Lamb．）Hook．]混交林中拟赤杨木材的物理力学性质和化学组分进行了测定和比较分析。结果表明，混交林中拟赤杨的木材密度、干缩系数和力学强度均大于纯林，且拟赤杨-马尾松混交林中拟赤杨木材的各指标值均最高。拟赤杨-杉木混交林中拟赤杨木材的热水抽出物、1％NaOH抽出物、苯醇抽出物、硝酸-乙醇纤维素和Klason木素含量分别为2．31％、18．63％、2．52％、45．74％和21．59％，均高于纯林；拟赤杨-马尾松混交林中拟赤杨木材的戊聚糖含量（22．98％）高于纯林。说明拟赤杨-马尾松混交林中拟赤杨木材的材性总体上最优，在拟赤杨木材品质培育过程中宜选择马尾松作为伴生树种。

Comparative analysis on wood property of Alniphyllum fortunei in pure and mixed forests

Physical and mechanical properties and chemical composition of Alnlphyllum fortunei Makino wood in A. fortunei pure forest, A. fortunei-Pinus massoniana Lamb. mixed forest and A. fortunei-Cunninghamia lanceolata （Lamb.） Hook. mixed forest were determined and analyzed comparatively. The results showed that wood density, shrinkage coefficient and mechanical strength of A. fortunei wood in mixed forests were higher than that in A. fortunei pure forest. Furthermore, those indexes of A. fortunei wood in A. fortunei-P, massoniana mixed forest were the highest. Contents of hot water extractive, 1% NaOH extractive, benzene-alcohol extractive, nitric acid-alcohol cellulose and Klason lignin of A. fortunel wood in A. fortunei-C, lanceolata mixed forest respectively reached to 2.31% , 18.63%, 2.52%, 45.74% and 21.59%, which were higher than that in A. fortunei pure forest. Pentosan content of A. fortunei wood in A. fortunei-P, massonlana mixed forest was 22.98% , which was higher than that in A. fortunei pure forest. It is suggested that in generally, the wood property indexes of A. fortunei wood in A. fortunei-P, massoniana mixed forest are the best. Therefore, P. massoniana is suitable for used as the associated tree species in process of timber culture of A. fortunei wood.