摘要
为探明不同间伐强度对重庆地区马尾松人工林生长的影响,在重庆市綦江区北部林场选择马尾松人工纯林(18年生)开展抚育间伐试验,分别设置弱度间伐(间伐株数占总株数的15%,保留密度1410株·hm^(-2))、中度间伐(间伐株数占总株数的30%,保留密度1155株·hm^(-2))、较强度间伐(间伐株数占总株数的45%,保留密度900株·hm^(-2))、不间伐(保留密度1650株·hm^(-2))等4种间伐强度。间伐3 a后调查结果表明,抚育间伐能显著提高马尾松人工林林分胸径的生长,林分平均胸径的生长量在一定范围内随间伐强度的增大而明显提高;不同间伐强度对马尾松林分平均树高生长的影响无显著差异;单位面积林分蓄积量大小依次为:间伐强度30%>间伐强度15%>对照组>间伐强度45%。说明间伐强度30%已达到了最佳的林分质量和收获量,是该区域马尾松人工林最优的抚育间伐强度,而1155株·hm^(-2)是较合理的伐后密度。
In order to explore the effects of different intermediate cutting intensities on growth of Pinus massoniana forests of Chongqing,four different thinning intensity treatments were designed at north forest farm of Qijiang.They were indentified as following species：low-intensity thinning which tending felling amount account for 15% of total plants and the reserve density was 1410 trees·hm^-2,medium thinning which deforestation occupy 30% and the density was 1155 trees·hm^-2,relatively strong thinning which the chop number was more than 45% and leaving 900 trees·hm^-2,and then the control group.Three years＇ thinning experiments were carried out in middle aged masson pine plantations,in the hope of providing a scientific basis for intermediate cutting of Pinus massoniana in local situation.The results showed that thinning could significantly promote the DBH growth of masson pine forests,the yearly growth rise with the increasing of thinning intensity,but thinning have no obviously effect on height growth.The changes of stocking per unit area as the response of different intermediate cutting are inconclusive,the thinning intensities of 15% and 30% have a higher stand volume than others,followed by the control group,and the heavy thinning group（45%） shows the lowest volume increment.It is considered that the thinning intensities of 30% is better than others,and the remaining trees are 1155 trees·hm^-2 after 3 years＇ experiment.Medium thinning（30%） is beneficial to improve the whole quality of masson pine forest land,and to get the maximum harvest yield.
作者
马正锐
孟祥江
王蕾
陈本文
MA Zhengrui;MENG Xiangjiang;WANG Lei;CHEN Benwen(Chongqing Academy of Forestry, Chongqing 400036, Chin)
出处
《福建林业科技》
2017年第4期33-36,67,共5页
Journal of Fujian Forestry Science and Technology
基金
重庆市林业重点科技攻关项目(重庆市马尾松近自然经营技术研究
渝林科研2014-4)
关键词
马尾松
人工林
间伐强度
重庆
Pinus massoniana
plantation
intermediate cutting
Chongqing
