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Optimal Diameter Structure for Spruce-fir Conifer and Broadleaf Mixed Stands in Changbai Mountains
Author(s): 
Pages: 1-6
Year: Issue:  1
Journal: Journal of Northeast Forestry University

Keyword:  Optimal diameter structureDiameter grade transitionTree mortality rateDiameter grade advanced rateBasal area at breast height per hectare;
Abstract: 以长白山云冷杉针阔混交林两个大区内274个固定样点为研究对象,样地内每木检尺;从1987年至今,每两年复查一次.利用不同模型拟合该地区林分每公顷胸高断面积和每公顷蓄积的关系,求得林分能够生长达到的每公顷最大胸高断面积,并以此为界将现有林分胸高断面积分成<10、10~20、30~40、40 ~50 m2/hm24个胸高断面积区间,分别计算各胸高断面积蓄积生长量.结果表明:林分进阶率和枯损率随胸高断面积的增加而减少;林分蓄积生长量随胸高断面积增加而先增大后减少.林分能够生长达到的最大胸高断面积大约为60 m2/hm2,但当林分胸高断面积为40m2/hm2,平均Q值为1.4时,林分蓄积生长量最大(10.5 m3/(hm2·a)).利用呈负指数模型,结合林木径阶能够持续生长的转移情况,拟合出该地区林分最优直径结构.
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