摘要
通过对鲁西南砂石山构树胁迫防护林生长的调查研究,平茬2 a后构树灌木平均株数、分枝数分别比对照株增加了132.95%、-24.50%,证明构树灌木平茬能够刺激伐桩萌蘖,短期内会加剧对目标林分的生长胁迫。林分郁闭度≥0.75时,林下构树覆盖度≤5%,林下构树种籽或平茬构树失去必须的生存环境;林分郁闭度≤0.3时,林下构树覆盖度≥95%,会对目标林分造成严重的生长胁迫。研究表明,郁闭度低于临界值(郁闭度≤0.3)的目标林分或存在林中空地的林分,有目的选择原生灌木枝条进行人工促进天然更新或补植造林的方式提高林分郁闭度能够使低质低效林达到快速林相改造的目的。
The investigation and study on the growth of Broussonetia papyrifera stress shelter forest in the gravel mountain of southwest Shandong showed that the average number of trees and branches of Broussonetia papyrifera shrubs increased by 132.95%and-24.50%respectively after two years of flat stubble,which proved that Broussonetia papyrifera shrubs could stimulate stump germination and aggravate the growth stress on the target forest in a short time.When the canopy density is less than 0.75,the coverage of under-forest Broussonetia papyrifera is less than 5%,and the seeds or stubble Broussonetia papyrifera under the forest lose the necessary living environment;When the canopy density is less than 0.3,the coverage of Broussonetia papyrifera is less than 95%,which will cause serious growth stress to the target stand.It is shown that for the target stand with canopy density lower than the critical value(canopy density≤0.3)or the stand with open space in the forest,the purpose of improving the canopy density by artificially promoting natural regeneration or replanting afforestation with original shrub branches can make the low-quality and low-efficiency forest achieve the goal of rapid forest phase transformation.
作者
孔慧
徐庆
张洪生
屈峰
孔祥娟
赵冬
孔令雷
KONG Hui;XU Qing;ZHANG Hongsheng;QU Feng;KONG Xiangjuan;ZHAO Dong;KONG Linglei(Agricultural Comprehensive Service Center of Shuyuan Street in Qufu City,Shandogn Qufu 273125;Qufu Natural Resources and Planning Bureau,Shandogn Qufu 273100)
出处
《林业科技》
2024年第2期11-14,共4页
Forestry Science & Technology
基金
2022年中央财政森林抚育项目(鲁财资环指[2021]41号)资助。
关键词
防护林
林分郁闭度
构树
生长
制约性
shelter forest
canopy density
Broussonetia papyrifera
grow
restriction
