桉树萌芽林留萌株数对伐期林分结构与材积的影响
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摘要
萌芽林采用随机区组设计,分别留萌1、1.5、2、3株·桩~(-1),结果表明:在萌芽林6年生时,平均胸径与树高随留萌株数增加而减少,平均胸径变异系数则增加;保存率与留萌株数的关系主要受到台风影响;不同留萌株数的树皮厚度与径级﹑生长量有关;留萌株数对桉树的树高与胸径影响不大;就单位总材积而言,留萌3株·桩~(-1)的林分比1株·桩~(-1)的高50%,2株·桩~(-1)的比1株·桩~(-1)的高10%。
The influence of the number of coppice stems per stump on stand structure and volume was studied with treatments averaging 1, 1.5, 2 and 3 stems per stump in field trial with randomized block design. Those trees with fewer coppice stems were found to have higher height and diameter increments the sixth year. Both survival rates of coppiced trees and survival of coppice stems seemed to primarily be affected by typhoons. Bark thickness differed with diameter class but not was not directly affected by number of stems per stump. The relation between height and diameter did not differ as the number of coppice stems per stump varied. The stand volume of 3 stems and 2 stems left per tree stump was 50% and 10% higher left respectively than stands with just one stem left per tree stump.
The influence of the number of coppice stems per stump on stand structure and volume was studied with treatments averaging 1, 1.5, 2 and 3 stems per stump in field trial with randomized block design. Those trees with fewer coppice stems were found to have higher height and diameter increments the sixth year. Both survival rates of coppiced trees and survival of coppice stems seemed to primarily be affected by typhoons. Bark thickness differed with diameter class but not was not directly affected by number of stems per stump. The relation between height and diameter did not differ as the number of coppice stems per stump varied. The stand volume of 3 stems and 2 stems left per tree stump was 50% and 10% higher left respectively than stands with just one stem left per tree stump.
引文
[1]卢祖俊.桉树萌芽林的栽培技术措施[J].广西林业,2005(5):28.
[2]侯远瑞,陈金艳,陈妙杰.尾叶桉萌芽林经营技术及效益评价[J].广西林业科学,2005,34(4):205–206.
[3]沈云,吴兵,申文辉,等.尾巨桉人工林萌芽更新最佳经营模式技术[J].广西林业科学,2006,35(增刊):14–17.
[4]杨曾奖,徐大平,江松远,等.尾叶桉萌芽林留条数量对生长和产量的影响[J].林业科学研究,2002,15(5):582–587.
[5]徐其贤.简述雷州林业局桉树萌芽林的栽培管理措施[J].林业科学,2017,37(06):199–200.
[2]侯远瑞,陈金艳,陈妙杰.尾叶桉萌芽林经营技术及效益评价[J].广西林业科学,2005,34(4):205–206.
[3]沈云,吴兵,申文辉,等.尾巨桉人工林萌芽更新最佳经营模式技术[J].广西林业科学,2006,35(增刊):14–17.
[4]杨曾奖,徐大平,江松远,等.尾叶桉萌芽林留条数量对生长和产量的影响[J].林业科学研究,2002,15(5):582–587.
[5]徐其贤.简述雷州林业局桉树萌芽林的栽培管理措施[J].林业科学,2017,37(06):199–200.