林隙大小对华北落叶松人工林林下更新动态的影响  

Effects of Gap Size on Regeneration Dynamics of Larix principis-rupprechtii Forest

作　　者：张宇 魏曦 梁文俊[1] 刘子琦 李福明 赵怡 冯泳翰 ZHANG Yu;WEI Xi;LIANG Wen-jun;LIU Zi-qi;LI Fu-ming;ZHAO Yi;FENG Yong-han(College of Forestry,Shanxi Agricultural University,Taigu 030801,Shanxi,China)

机构地区：[1]山西农业大学林学院,山西晋中030801

出　　处：《林业科学研究》2022年第4期84-92,共9页Forest Research

基　　金：国家自然科学基金项目(31901365,31971644);山西省高等学校科技创新项目(2021L105);山西省优秀博士来晋工作奖励资金科研项目(SXYBKY2018032);山西农业大学科技创新基金项目(2018YJ09);山西农业大学引进人才科研启动项目(2014YJ19)。

摘　　要：[目的]明确关帝山华北落叶松人工林林隙下天然更新现状,探究林隙大小对更新的影响。[方法]通过调查不同林隙下华北落叶松幼苗幼树密度、生长现状及林隙下幼苗幼树空间分布,应用K2函数进行点格局分析,了解林隙下幼苗幼树的空间格局。[结果](1)华北落叶松更新密度和生长指标随林隙面积的升高呈现正显著影响(P<0.05)。林隙大小对幼苗幼树生长指标(基径、高度、年龄)的影响最显著,最大均值多出现在林隙等级Ⅰ(20~50 m^(2)),幼苗幼树密度最大均值分别出现在林隙等级Ⅱ(50~100 m^(2))和Ⅲ(100~150 m^(2))中。(2)幼苗幼树大部分分布在树冠投影区及冠空隙边缘,且有逐渐向林隙中心生长的趋势。(3)华北落叶松林样地林隙内更新苗大部分呈现聚集分布且发生在小尺度上,小部分呈现均匀分布。[结论]林隙大小对华北落叶松更新有显著影响,林隙等级Ⅰ(20~50 m^(2))有助于幼苗的建立和萌发,随着平均胸径的增大,为提高资源的有效性、减少更新苗之间的竞争、扩展更多生态位空间,后期可通过人为干扰扩大林隙面积至等级Ⅱ(50~100 m^(2)),促进幼苗的存活及幼树的生长。[Objective] To explore the natural regeneration in Larix principis-rupprechtii plantation in Guandi Mountain, and explore the effect of gap size on regeneration. [Methods] In this study, the density, growth status and spatial distribution of seedlings of Larix principis-rupprechtii under different gap sizes were investigated. The K2 function point pattern analysis was performed for exploring spatial pattern of seedlings under different gap sizes. [Results](1) The regeneration density and growth indices of Larix principis-rupprechtii were positively correlated with the increase of gap area(P < 0.05). Gap size had the most significant effect on sapling growth indexes(base diameter, height and age). The maximum mean values of growth indexes mostly appeared in gap grade Ⅰ(20~50 m^(2)), and the maximum mean values of seedlings and saplings density appeared in gap grade Ⅱ(50~100 m^(2)) and Ⅲ(100~150 m^(2)), respectively.(2) Saplings mostly distributed in the canopy projection area and canopy gap edge, and gradually distributed in the center of the gap.(3) In the gap of Larix principis-rupprechtii, most of the saplings were aggregated and distributed in small scale, and few saplings were evenly distributed. [Conclusion] Gap size has a significant effect on regeneration of Larix principis-rupprechtii. Gap grade Ⅰ(20~50 m^(2)) is conducive to seedling establishment and germination. In addition, the gap area could be enlarged to grade Ⅱ(50~100 m^(2)) by human disturbance to promote seedling survival and sapling growth.

关 键 词：华北落叶松更新 林隙 点格局分析 空间结构 

分 类 号：S754[农业科学—森林经理学]