摘要
从不同生境和树干胸径的角度研究分枝格局,以揭示树木的结构复杂性程度与生长策略差异,为冀西北山地森林林业管理提供理论依据。以冀西北地区白桦纯林和3个典型混交林为研究对象,采用线性回归法和非参数Kruskal-Wallis检验法,分析胸径和生境对白桦分枝格局的影响。结果表明:①树干胸径对白桦分枝长度、基径和枝生物量的影响显著线性增长(p<0.05),且影响程度随分枝逐级减小(对分枝长度逐级影响为0.504>0.125>0.063>0.034>0.033;基径为0.037>0.014>0.011>0.006>0.005;生物量为0.414>0.025>0.007>0.003>0.002);②不同生境间的各级枝长、枝径和枝生物量都满足:混交林Ⅰ(白桦-落叶松)>混交林Ⅲ(白桦-杏树-杨树-樟子松)>白桦纯林>混交林Ⅱ(白桦-云杉);③白桦落叶松混交林的枝长、基径、生物量和分枝密度均优于其他林型,以最大限度获取空间资源,白桦落叶松混交林是最适合冀西北白桦生长的生境。
The branch pattern was studied from the perspective of different habitats and trunk diameters,in order to reveal the difference of structural complexity and growth strategies of trees,and to provide theoretical basis for forest management in the mountainous region of northwest Hebei.Linear regression and non-parametric Kruskal-Wallis test were used to analyze the effects of DBH(diameter at breast height)and habitat on the branching pattern of birch(Betula platyphyllum Suk.)in pure and three typical mixed forests in northwestern Hebei Province.Results show these as follows.The DBH of the trunk,branch length,basal diameter and branch biomass of birch increase significantly with DBH(p<0.05).In the same habitat,the branch length,basal diameter and biomass of birch decrease with the ascent of branch rank,while the branch length ratio,branch diameter ratio and branch rate increase with the ascent of branch rank.The branch length,branch diameter and branch biomass at all levels are similar:mixed forestⅠ(Birch-Larch)>mixed forestⅢ(Birch-Apricot-Poplar-Sylvestre pine)>Pure Birch forest>mixed forestⅡ(Birch-Spruce).The results show that the DBH and habitat of birch can affect the branching pattern.The branch length,basal diameter,biomass and branching density of birch-larch mixed forest are better than those of other forest types,so as to maximize the environmental resources.The birch-larch mixed forest is the most suitable habitat for birch growth in northwestern Hebei.
作者
郑玉
张化永
邹恒超
黄头生
白卓青
甄欣欣
ZHENG Yu;ZHANG Hua-yong;ZOU Heng-chao;HUANG Tou-sheng;BAI Zhuo-qing;ZHEN Xin-xin(Research Center for Engineering Ecology and Nonlinear Science,North China Electric Power University,Beijing 102206,China)
出处
《科学技术与工程》
北大核心
2024年第3期970-979,共10页
Science Technology and Engineering
基金
国家“十三五”水体污染控制与治理科技重大专项(2017ZX07101)。
关键词
白桦
分枝格局
胸径
生境
K-W检验
Betula platyphylla Suk.
branching pattern
DBH
habitat
Kruskal-Wallis
