马尾松林分大径材个体异型生长模式解析

An analysis on allometric growth models of individuals with huge DBH on Pinus massoniana forest

用函数拟合马尾松大径材胸高断面积生长过程,通过1stOpt软件求解参数。从数理统计意义上看,相关系数均达到极显著相关水平,而Logistic函数参数具有良好的生物学意义,因此能作为马尾松个体胸高断面积生长过程拟合的合理模型。基于相同起源的马尾松大径材各个体Logistic函数参数计算所得的拐点值、潜在生长量最大值均显著不同。在21株大径材个体中,拐点出现于林龄50~60年间、20~29年间的株数各占23.81%,拐点出现于30~39年间和13~19年间株数各占28.57%和19.05%。说明马尾松林分个体异型生长特点有其普遍性。分析认为,马尾松大径材林分经营期设定在50年左右较为合理。

The growth process of Pinus massoniana with large diameter at DBH′s cross-section areas at breast height was fitted by function and the multiple functions solved by 1stOpt software.Though correlation coefficients for all functions fitted were significant(P<0.01),only had parameters of Logistics function given the biological meaning.Therefore,only could Logistics function be taken as the rational model for fitting the cross-section areas at breast height.There were significant differences among values of infection point and maximum potential growth of cross-section areas at breast height according to Logistics fitting for P.massoniana individuals with the same origination.Among 21 individuals,there was 23.81%individuals whose infection points fell into group of tree age 50 to 60 and 20 to 29,respectively.While,28.57%individuals fell into group of tree age 30 to 39 and 19.05%into group of age 20 to 29,respectively.The study explained the characteristics of P.massoniana stands′allometric growth and provided contradictory findings on the established allometric growth models.The final age for managing P.massoniana stand with large DBH be reasonably set up about 50 years.