水曲柳早期选择研究

The early selection research of Fraxinus mandshurica

以吉林省中东部水曲柳天然林和人工林平均优势木为材料,通过树干解析研究生长性状早晚期相关性,结果表明：不同林分类别个体生长变异随树龄增大而减小,幼-成龄相关系数随树龄增大而增大,其中天然林变异系数递减率在25 a生后趋于平稳,各生长性状幼-成龄相关性在25 a生时达到显著或极显著水平;人工林变异系数递减率在9~12 a生以后趋于平稳,各生长性状幼-成龄相关性在9 a生时达到显著或极显著水平.天然林除树高外,其他各生长性状早期选择效率均在25 a生时达到最大值,而后逐渐减小;人工林除材积外,9~12 a生时各性状早期选择效率达到最大值.综合分析不同性状生长变异规律、早晚期相关及选择效率,初步确定天然林和人工林最佳早期选择树龄分别为25 a生和9 a生.

The growth trait correlation of early and late stage was researched through trunk analytical study by taking averagedominate tree of Fraxinus mandshurica natural forest and artificial forest in the mid - east region of Jilin province. The resultshowed that different forest stand category individual grow variation decreased along with the increace of age of tree.The correlation coefficient between young and mature increased along with the increace of age of tree. The variable coefficientdecline rate of natural forest tended to smooth and steady after 25 years. The correlation between young and mature ofeach growth trait reached significant or extremely significant level at 25 years. The variable coefficient decline rate of artificialforest tended to smooth and steady after 9 ？12 years. The correlation between young and mature of each growth traitreached significant or extremely significant level at 9 years. The other growth trait early selection efficiency of natural forestexcept height of tree reached maximum at 25 years and decreased after that gradually. Each characters of early selection efficiencyof artificial forest reached maximum at 9 ？ 12 years. The best early selecting age of tree of natural and artificial forestwas 25 years and 9 years by analyzing growth variation rules, early - late period correlation and selecting efficiency