This study addresses the increasing demand for large-diameter production timber,and considers the time and space variability of half-sib families of Pinus massoniana.Height,diameter at breast height(DBH)and timber vol...This study addresses the increasing demand for large-diameter production timber,and considers the time and space variability of half-sib families of Pinus massoniana.Height,diameter at breast height(DBH)and timber volume of 440 open-pollinated half-sib progeny families were investigated in 14 progeny trials in different years and production regions.An evaluation of the genetic variation of all half-sib families was carried out during the sustainable rapid growth period and individual volumes were characterized as a major index.ANOVA analysis showed that there was considerable variance in the growth traits of most families in different years and on different sites.The variations caused by temporal and spatial changes of the mating system required three selection methods for analysis.The results show that there were differences among the heritabilities of different growth traits by different halfsib progenies.Average heritability values of height,DBH and volume were 0.33,0.34 and 0.36,respectively.Fortyfive superior families were selected in every progeny test,12 were selected in progeny trials by different years and five in different habitat progeny trials.Three superior families(Gui GC553A,Gui GC414A and Gui GC431A)were selected,although in different years and production regions.The genetic gains of timber volume of these selected r families ranged from 1.20 to 47.00%,which could provide a foundation for superior wood property selection and serve as material for seed improvement and extension in surrounding areas.展开更多
择伐作业已成为近自然林改造中的基本经营方式，如何在兼顾林业企业经济效益的前提下进行择伐成为森林可持续经营研究中的重要课题；森林经营单位硬件条件、经营水平的不断提高以及林内立木数据的大量传回，要求有一种新的经营理念和方...择伐作业已成为近自然林改造中的基本经营方式，如何在兼顾林业企业经济效益的前提下进行择伐成为森林可持续经营研究中的重要课题；森林经营单位硬件条件、经营水平的不断提高以及林内立木数据的大量传回，要求有一种新的经营理念和方法与之适应。提出泛储木场理念下的营销思想，探讨在该理念下的用材林经营方式。根据广西大青山林区内分布于上、中、下3个坡位，胸径12～48 cm 的米老排林立木数据，用统计模型的方法拟合此经营方式下米老排的树高曲线和削度方程，给出一种实现林木生长量最大化且没有储木场损失的米老排用材林营销流程。展开更多
文摘This study addresses the increasing demand for large-diameter production timber,and considers the time and space variability of half-sib families of Pinus massoniana.Height,diameter at breast height(DBH)and timber volume of 440 open-pollinated half-sib progeny families were investigated in 14 progeny trials in different years and production regions.An evaluation of the genetic variation of all half-sib families was carried out during the sustainable rapid growth period and individual volumes were characterized as a major index.ANOVA analysis showed that there was considerable variance in the growth traits of most families in different years and on different sites.The variations caused by temporal and spatial changes of the mating system required three selection methods for analysis.The results show that there were differences among the heritabilities of different growth traits by different halfsib progenies.Average heritability values of height,DBH and volume were 0.33,0.34 and 0.36,respectively.Fortyfive superior families were selected in every progeny test,12 were selected in progeny trials by different years and five in different habitat progeny trials.Three superior families(Gui GC553A,Gui GC414A and Gui GC431A)were selected,although in different years and production regions.The genetic gains of timber volume of these selected r families ranged from 1.20 to 47.00%,which could provide a foundation for superior wood property selection and serve as material for seed improvement and extension in surrounding areas.
基金Yunnan Province Government(Contracts:Yunjikezi 182and Degree Support No.26)and the Central Government of China(Contracts:02EFN216700806 and[2002]Linkezhongzi No.5).
文摘择伐作业已成为近自然林改造中的基本经营方式，如何在兼顾林业企业经济效益的前提下进行择伐成为森林可持续经营研究中的重要课题；森林经营单位硬件条件、经营水平的不断提高以及林内立木数据的大量传回，要求有一种新的经营理念和方法与之适应。提出泛储木场理念下的营销思想，探讨在该理念下的用材林经营方式。根据广西大青山林区内分布于上、中、下3个坡位，胸径12～48 cm 的米老排林立木数据，用统计模型的方法拟合此经营方式下米老排的树高曲线和削度方程，给出一种实现林木生长量最大化且没有储木场损失的米老排用材林营销流程。
