火炬松纸浆林材性变异和优质原料培育期的确定  

Variation in Wood Characteristics and Rotatlon Age of Loblolly Pine for Pulpwood

作　　者：徐有明[1] 

机构地区：[1]武汉市华中农业大学

出　　处：《林业科学研究》1995年第5期544-549,共6页Forest Research

基　　金：1991年湖北省自然科学基金

摘　　要：１６年生火炬松纸浆材性状研究表明：管胞长度径向呈递增稳定的模式，纵向呈递减变化；其长宽比变异类似于管胞长度的变化；管胞长度变化范围为１．４０３～４．４５６ｍｍ，长宽比为４６．７～７０．１，腔径比为０．７１１～０．７８６，壁腔比为０．３８１～０．４９６。基本密度径向由０．３２４ｇ／ｃｍ３递增到０．４２８ｇ／ｃｍ３；纵向递减，其均值变动于０．３１４～０．４０１ｇ／ｃｍ２；株间木材密度均值与管胞长度两性状不相关。纤维素含量由髓心附近３７．０４％递增到树皮附近４３．９１％，木素、多缩戊糖含量分别由２８．７８％、１４．５９％递减到２５．７４％、１２．０５％，其苯醇抽出物含量变化在２．１２％～８．３８％之间。火炬松木材幼龄期约为１０～１３ａ。基于火炬松木材各树龄材性的变化，结合生长量指标，确定其短周期纸浆林适宜采伐树龄约为１２～１３ａ。Tracheid length in radial direction first gradually increases and then levels offfrom pith to bark.It decreases along the stem height.Variation in tracheid length-width ra-tio is similar to that in tracheid length.Tracheid length,length-width ratio,double wallthickness-diameter ratio and diameter-width ratio vary from 1.403 mm,46.7,0.381 and0.711 to 4.456 mm,70.1,0.496 and 0.786 respectively within 16 years old trees of loblollypine. Specific gravity increases from 0.324 g/cm3 at pith to 0.428g/cm3 at bark and it de-creases from 0.401 to 0.314 g/cm3 along the stem height.The mean value of specific gravityat a given height between trees is not related to that of tracheid length. Cellulose content asends from pith(37.04%)to bark (43.91%),lignin and pentosancontents descends from pith (28.78%and 14. 59%)to bark(25.74%and 12.05%)and theextractives content is between 8.38%and 2.12%. The juvenile period of its wood is about 10 to 13 years old.According to basic demands of pulpwood properties,variation in woodcharacteristics of different age tree and the growth property of tree,rotation age of loblollypine for pulpwood is about 12 to 13 years old.

关 键 词：火炬松 纸浆材 材性变异 培育期 

分 类 号：S791.255[农业科学—林木遗传育种]