摘要
为探究间伐对华北落叶松(Larix principis-rupprechtii)人工林空间结构的影响,以3种不同间伐强度林分设置实验样地进行研究。结果表明,各间伐强度个体随角尺度变化趋势相同,处于随机分布的个体较多,弱度间伐和强度间伐林分角尺度呈显著差异,弱度间伐林分整体呈随机分布,强度间伐和中度间伐林分呈聚集分布;随着混交度的升高,华北落叶松个体数呈明显下降趋势,强度间伐个体数下降速率明显高于中度间伐;弱度间伐和强度间伐林分混交度表现出显著差异,弱度间伐(M_(i均)=0.48)混交程度接近中度混交,强度间伐(M_(i均)=0.35)林分处于弱度以下混交,中度间伐(M_(i均)=0.23)处于中度以下混交;弱度间伐林分参照树个体数随大小比数的升高呈上升趋势,其余间伐强度林分无显著变化趋势,弱度间伐林木分化程度高,目标参照树受竞争压力偏大。
In order to explore the influence of intermediate cuttings on the spatial structure of Larix prin- cipis-rupprechtii, three experimental plots with different thinning intensities were set up to investigate. Re- suits showed that the plants in the plots with different thinning intensities were similar with the change of uni- form angle index, and more individuals were random distribution. There was significant difference in uniform angle index between light thinning and heavy thinning. The stand with light thinning distributed randomly, while the heavy thinning and intermediate thinning were concentrated distribution. The number of plant showed an obvious downward trend with the increase of mixed degree, and the decline rate of number in stand with heavy thinning was obviously higher than that of intermediate thinning; there was significant difference in min- gling index between light thinning and heavy thinning. The mingling index of light thinning was 0.48, which was close to intermediate mixed degree, the mingling index of heavy thinning was 0.35, which was the weak mixed degree, and the mingling index of intermediate thinning was 0.23, which was intermediate mixed de- gree; the plants in weak thinning increased with the increase of neighborhood comparison, and there was no significant change in stands with intermediate and heavy thinning. The differentiation was strong in weak thin- ning and the plants had more competitors.
作者
刘泰瑞
董威
覃志杰
张芸香
郭晋平
LIU Tai-rui1, DONG Wei1, TAN Zhi-jie1, ZHANG Yun-xiang1, GUO Jin-ping2(1. College of Forestry, Shanxi Agricultural University, Taigu 030801, China; 2. Graduate School, Shanxi Agricultural University Taigu 030801, China)
出处
《广西林业科学》
2018年第3期290-294,共5页
Guangxi Forestry Science
基金
国家林业行业专项(201404417)
山西省攻关项目(20140311014-3)
山西省国际合作项目(2015081001)
关键词
华北落叶松
间伐强度
空间结构
Larix principis-rupprechtii
thinning intensity
spatial structure
