摘要
[目的]研究不同采伐方式与强度对阔叶红松林群落结构和功能的影响。[方法]通过调查乔木的胸径、树高以及在样方中的位置等指标,采用Hegyi单木竞争指数模型,对长白山地区受不同采伐方式以及强度干扰的阔叶红松林群落中乔木竞争强度进行定量分析。[结果]不同采伐方式和强度对阔叶红松林中乔木竞争强度有不同影响,低强度择伐后变化最小,皆伐后变化最大。不同林层间乔木竞争强度有明显差异,主林层<次林层<林下层。无论采伐方式与强度如何,红松的胸径与其竞争指数都严格服从CI=A(DBH)B的幂函数关系。采伐对红松种内竞争强度有重要影响,随着采伐强度的加大,红松种内竞争压力减小,红松幼树更新得到促进。[结论]采伐经营应保持17%以下的小强度择伐,而择伐时应选择那些胸径大且在竞争中占绝对优势的针、阔叶树种。
[ Objective ] The purpose was to study the effect of different cutting modes and intensity on community structure and tunchon ot bread-leaved Korean pine forest. [ Method] By investigating the indexes of DBH, tree height of trees and their position in quadrat etc. and using Hegyi＇ssingle tree competition index model, the quantitative analysis was conducted on competition intensity of trees in the community of broad-leaved Korean pine forest, which were under different cutting modes and intensity interference. [ Result] The varied cutting modes and intensity had different influence on competition intensity of trees in the broad-leaved Korean pine forest; the change was the least after low intensity selective cutting, while the clear cutting had the most variation. The tree competition intensity among different forest layers had significant differences with the order of： overstory 〈 sub-story 〈 understory. No matter what the cutting modes and intensity were, the DBH of Korean pine and its competition index were strictly obeyed by power function relationship of CI = A（DBH） B. The cutting had important affection on intraspecific competition of Korean pine, the pressure of intraspecific competition of Korean pine was minished with the increase of cutting intensity, and the renewal of Korean pine saplings was advanced. [ Conclusion] The cutting management should be kept in selective cutting of little intensity lower than 17%, and the coniferous and bread-leaved tree species with big DBH and absolute superiority in competition should be chosen in selective cutting.
出处
《安徽农业科学》
CAS
北大核心
2009年第27期13317-13321,13338,共6页
Journal of Anhui Agricultural Sciences
基金
国家自然科学基金(40873067
30800139)
国家科技支撑项目(2006BAD03A09)
关键词
采伐
竞争强度
阔叶红松林
种间竞争
种内竞争
Cutting
Competition intensity
Broad-leaved Korean pine forest
Interspecific competition
Intraspecific competition
