贵州省马尾松纸浆材的优树选择研究

Superior tree selection of Pinus manssoniana for pulpwood purpose in Guizhou province

采用5株优势木对比法,在贵州省2个县的马尾松天然林中,共初选出马尾松优树20株,优势木100株。经统计分析,确定贵州省马尾松天然林中的优树初选标准为:优树胸径≥5株优势木平均胸径的111%,综纤维含量不低于优势木均值,1%NaOH抽提物含量不高于均值。以树皮指数、冠高比、结实指数等性状作为优树形质指标,结合生长性状和材性性状,制定了综合评分标准,以综合得分不低于60分为贵州省马尾松纸浆材优树选择标准。对初选的20株优树进行综合评定,从而决选出马尾松优树11株,入选率为55%,入选优树材积较对照平均提高了62%,材性有所改良,这11株优树可用于贵州马尾松纸浆材专性种子园营建。

By taking the method of 5 dominant trees comparison, 20 superior trees and 100 dominant trees of Pinus rnanssoniana were selected from the natural stand in 2 counties of Guizhou province. On the basis of statistical analysis, the selection standard of P manssoniana plus tree was formulated that the superior tree DBH should be greater than or equal to average DBH＇s 111 % of the five-dominant-tree, the holocellulose content of the plus tree should be no less than that of five-dominant-tree＇s mean value, and 1% NaOH extraction content of the superior tree no higher than that of mean value. Crown/height, curvature, cone index, bark index and ormquotient were regarded as the form quality of plus trees, and the comprehensive scoring standard for selection superior trees was established by combing with growth characters and material quality. The selection standard of P. manssoniana plus tree was that the comprehensive scores should be no less than 60 scores. With this standard, the primary selective 20 superior trees were comprehensively evaluated, thus 11 plus trees were finally chosen, the selection rate was 55%, the wood volume of selected plus trees increased by 62% than the control averagely, and wood property was improved. The 11 plus trees can be applied to the construction of the pulpwood orchard ofP manssoniana in Guizhou.