抚育间伐对辽东山区蒙古栎阔叶混交林空间结构的影响  

Influence of thinning on spatial structure of mixed Quercus mongolica broad-leaved forest in mountainous area of eastern Liaoning

作　　者：董莉莉[1] DONG Lili(Liaoning Academy of Forest Science,Shenyang 110032,China)

机构地区：[1]辽宁省林业科学研究院,辽宁沈阳110032

出　　处：《辽宁林业科技》2020年第3期7-10,30,共5页Liaoning Forestry Science and Technology

基　　金：国家重点研发计划项目(2017YFC0504105);辽宁省“兴辽英才计划”项目(XLYC1902081)。

摘　　要：森林结构影响森林生产力与生态功能发挥,抚育间伐是调整森林结构的重要措施之一,为了明确不同间伐强度对蒙古栎阔叶混交林空间结构的影响,以辽东山区蒙古栎阔叶混交林为研究对象,通过设置4种间伐强度:强度41%、中度30%、弱度12%、对照0%,采用基于相邻木关系的林分空间结构参数,结合Hegyi竞争指数,分析了不同间伐强度对蒙古栎阔叶混交林空间结构的影响规律。结果表明:①辽东山区蒙古栎阔叶混交林整体混交度不高,处于弱度到中度混交的过渡状态,间伐能够提高林分的混交度,且随着间伐强度增加而增大。②除中度间伐样地表现为聚集分布外,其他间伐强度样地均属随机分布,间伐能够提高随机分布林木的比例,对于改善林分整体分布格局具有一定的积极作用,但具有一定的不确定性。③大小比数在描述林分整体分化程度时,变化幅度较小,灵敏度欠佳。综合考虑,经过中度、强度间伐后蒙古栎阔叶混交林的林木分布格局更合理,混交度更高。研究结果为天然林可持续经营提供理论依据与技术支撑。Forest structure has a great influence on forest productivity and ecological function.Thinning is a key measure to adjust forest structure.This study was carried out in a mixed Quercus mongolica broad-leaved forest in mountainous area of eastern Liaoning,four thinning intensities were set(high intensity 41% removed,moderate intensity 30% removed,weak intensity 12% removed,CK 0% removed),stand spatial structure parameters which were determined based on the relationships among neighboring trees combined with Hegyi competition index were employed to analyze the influence law of different thinning intensities on spatial structure.The result indicated:①The overall mingling degree of Q.mongolica broad-leaved forest in mountainous area of eastern Liaoning is during weak to moderate.Forest mingling degree was promoted by thinning and increased with the thinning intensities.②Moderate thinning plots showed aggregated distribution,whereas the other thinning intensities were randomly distributed.Thinning could increase the proportion of randomly distributed trees,which played a positive role in improving the stand distribution pattern,but with certain uncertainty.③When the neighborhood comparison was used to describe the stand differentiation degree,its variation range was small and sensitivity was poor.Taking all this into account,the water distribution pattern is more reasonable and the mingling degree is higher after moderate and intensive thinning.The research results provide theoretical basis and technical support for the sustainable management of natural forests.

关 键 词：蒙古栎阔叶混交林 抚育间伐 空间结构 竞争指数 

分 类 号：S753.7[农业科学—森林经理学]