坡位及疏伐抚育对紫椴人工林胸径生长的影响  

Effects of Slope Position and Thinning on Diameter Growth of Tilia amurensis Plantation

作　　者：于舒洋 范春楠[1] 郭忠玲[1] 郑金萍[1] 滕贵波[3] 魏永忠[3] YU Shuyang;FAN Chunnan;GUO Zhongling;ZHENG Jinping;TENG Guibo;WEI Yongzhong(Forestry College of Beihua University,Jilin 132013,China;Liaoning Bohao Land Technology Development Co.Ltd,Shenyang 110033,China;Experimental Forest Farm in Liaoning Province,Qingyuan 113309,China)

机构地区：[1]北华大学林学院,吉林吉林132013 [2]辽宁博昊土地科技发展有限公司,辽宁沈阳110033 [3]辽宁省实验林场,辽宁清原113309

出　　处：《北华大学学报（自然科学版）》2023年第2期159-164,共6页Journal of Beihua University（Natural Science）

基　　金：吉林省科技厅中青年科技创新创业卓越人才(团队)项目(创新类)(20210509016RQ);2021年吉林省留学人员科技创新创业项目;国家重点研发计划项目(2017YFD0600606);吉林省科技攻关项目(20190301084NY)。

摘　　要：以辽宁省实验林场1983年和1985年营建的紫椴人工林为对象,调查不同坡位和疏伐抚育林分的生长状况.采集紫椴个体年轮样品,分析胸径生长特征,明确紫椴人工林的生长规律,以及坡位和疏伐抚育对胸径生长的影响.结果表明:坡下紫椴人工林林分密度、林分蓄积、种群密度、蓄积均相对较大,种群的平均胸径、树高和单木材积也以坡下和坡中显著高于坡上;随着时间推移,各坡位紫椴胸径生长率整体均呈下降趋势,表现出前期下降较快,后期相对平缓,胸径生长整体以坡下高于坡中和坡上,坡下紫椴胸径生长率不仅在生长初期相对较高,在后期也呈现出小幅的生长加速;坡上、坡中及坡下的胸径连年生长量稳定时间分别为20、20和16 a.疏伐抚育后,紫椴胸径、树高和单木材积均显著高于未抚育林分,胸径生长率和5 a平均生长量也有显著提高,但疏伐抚育对紫椴胸径生长的促进作用时间相对较短.The study was conducted on Tilia amurensis plantation that was developed in 1983 and 1985 in Experimental Forest Farm in Liaoning Province,to investigate the growth of diameter at various slope positions and thinning.The objective of this study was to understand the growth pattern and the effects of slope position and thinning on the diameter growth of Tilia amurensis plantation through analyzing the characteristics of diameter growth from growth rings.Results showed that the stand growing at lower slopes demonstrated higher stand density,stand volume,larger population density and biomass accumulation of Tilia amurensis comparing with the stand at higher slopes.Lower and middle slopes also favored larger average diameter,higher average height and larger individual volume of Tilia amurensis.In general,the growth rate of diameter decreased with time despite the slope position,a uniform trend demonstrating faster decline of growth rate at early stage and a relative stable growth rate at later stage was observed at all slope positions.The growth of diameter at lower slopes was faster than that at that of middle and upper slopes in general,as the growth rate at lower slopes is relatively faster at the early stage comparing with the rate at higher slopes,with a small amount of increase at later growth stage.Time for the current annual increment of diameter to reach stable was 20 a,20 a,and 16 a at upper,middle and lower slopes.For the effect of thinning,the thinning could increase the diameter,height and individual volume of Tilia amurensis significantly.The growth rate and average 5 a of growth increment of diameter also increased significantly after thinning.However,the stimulating effect of thinning on the growth of diameter was temporary.

关 键 词：紫椴 人工林 胸径生长率 坡位 疏伐抚育 

分 类 号：S792.36[农业科学—林木遗传育种]