摘要
利用不同间伐强度后40 a的人工红松林,连续抚育3次的长期定位观测资料,分析了抚育间伐对人工红松单木胸径和材积、林分断面积和蓄积、林分枯损和总收获量的影响。研究结果表明:间伐可以增加单木平均胸径和材积的生长率,且不同间伐强度表现为相同的规律,即中度(33.2%)>强度(43.4%)>弱度(23.1%)>对照(0.0%);间伐后林分的断面积和蓄积生长率,具有相似的自然规律,间伐样地的生长率均高于对照;林木枯损率随间伐强度的增加而降低;间伐后的林分总收获量平均增加11.6%,间伐林分之间差别不明显。在整个研究阶段,不同的抚育阶段表现不同的规律,抚育间伐可以延缓单木胸径和材积生长速度的降幅;而不同抚育阶段内,林分断面积和蓄积生长率均为增长,也就是说,在一定阶段内间伐可以有效地提高林分平均断面积和蓄积生长率;从林分枯损状况来看,应该减少间伐间隔期。
In 40 years old Pinus koraiensis plantations which were thinned in different strength, the influence of thinning on breast di- ameter and volume of individual tree, stand basal area and stock volume, wood mortality and total yield were analyzed based on data from three times of tending thinning. The results indicated that thinning could increase mean breast diameter and volume of individual tree, and different thinning strength showed similar nile, i.e. middle thinning （33.2%） 〉heavy thinning （43.4%） 〉light thinning （23.1% ）〉control （ 0.0% ）. After thinning, stand basal area and stock volume growth late displayed the same nile, which were higher than that of control. Mortality rate were decreased with the increasing of thinning strength. After thinning, the mean yield was in- creased 11.6%,and there were no significant difference between that of different thinning strength. Thinning could delay the growth rate drop of breast diameter and volume of individual tree. The growth rotes of stand basal area and stock volume were increased in all thinning stages. The thinning interval should be shortened based on forest mortality.
出处
《辽宁林业科技》
2014年第1期1-5,26,共6页
Liaoning Forestry Science and Technology
基金
辽宁省博士启动计划(20121149)
辽宁省农业公关计划项目(2011207001)
关键词
红松
间伐强度
抚育间伐
生长效应
人工林
Pinus koraiensis
thinning strength
tending thinning
growth effect
plantation
