摘要
对广东省英德县桥头镇低丘台地上，初植密度为１２３０株／ｈｍ２的７年生火炬松人工林进行了不同间伐强度的试验，间伐２年后的结果表明：不同间伐强度对火炬松人工林的胸径、树高、单株材积和单位面积蓄积量均有极显著影响，对单位面积蓄积总量则无显著影响。强度和中度间伐均能极显著地提高胸径、树高和单株材积生长量；弱度间伐能极显著地提高树高生长量，显著提高胸径和单株材积生长量；强度间伐和中度间伐区间的胸径、树高和单株材积生长量差异均不明显；弱度间伐和对照区的单位面积蓄积量均极显著高于强度间伐区，弱度间伐区的单位面积蓄积量显著高于中度间伐区，中度间伐区的单位面积蓄积量显著高于强度间伐区，中度、弱度间伐区与对照区间的蓄积差异均不明显；间伐强度越大，伐后２年火炬松的胸径、树高、单株材积和单位面积蓄积量的增长率也越大。强度、中度、弱度间伐２年后大径木增加的比例分别比对照大１３％、１８．２５％、８．２５％。
A trial with various thinning intensity: (L) light; (M) moderate; (H) heavy; (C) control, was conducted in a 7 year old loblolly pine plantation grown on a low hill at Yingde city of Guangdong province. After 2 years, growth data showed that the effect of various thinning intensity on B.H.D., height , individual tree volume and per unit area growing stock was significant, whilst the effect on the total stock was not significant. The growths on B.H.D., height and individual tree volume were significantly increased with (M) and (H) comparing with (C). The growths on height, B.H.D. and individual volume were great significantly or significantly enhanced with (L). There was not significant difference in the growths on B.H.D., height and individual tree volume between (H) and (M). The growths increased on per unit area growing stock in (L) and (C) were significantly greater than that in (H), the growth of in (M) was significantly greater than that in (H). There were no significant difference in stock increasement between (M), (L) and (C). The greater the thinning intensity, the more increasement in growth on B.H.D., height, individual tree volume and per unit area growing stock. The proportions of trees over 12 cm B.H.D. on plantation with (H), (M) and (L) were 13%, 18.25 % and 8.25% more respectively than that in (C).
出处
《广东林业科技》
1997年第1期1-7,共7页
Forestry Science and Technology of Guangdong Province
基金
"八五"国家科技攻关专题
关键词
火炬松
人工林
抚育间伐
间伐强度
loblolly pine plantation, tending thinning, thinning intensity
