杨树短轮伐期萌芽更新造林与插干造林对比试验

ComparativeTrialofPoplarShortRotationSproutRegeneration underSproutMethodandCutageForestation

摘要:

为 了探索洞庭湖区杨树不同更新模式的可行性,对 xL-90杨萌芽更新造林与插干造林的林分生长及经济效益进 行对比研究 。萌芽更新造林每个伐桩保留 2个萌条,成林后实际密度 1 170株 ·hm-2 ;插干造林株行距为 4 mx3 m,平均 株数 840株 ·hm-2 。结果表明,更新造林 4 a,萌芽更新的胸径、树高、单株材积和单位蓄积依次为 17.47cm、14.62m、 0.1435 m3 和 167.93m3 ·hm-2 ,分别比插干造林高 6%、2%、14%和59%,单位面积利润高达 26890元 ·hm-2 ,是插干造 林的 3倍 。综上所述,xL-90杨在洞庭湖区适宜短轮伐期萌芽更新造林。

Abstract:

Inordertoexp1orethefeasibi1ityofdiferentregenerationmodesofpop1arinDongtingLakearea,thestand growthandeconomicbenefitsof xL-90pop1arregenerationundersproutmethodandcutageforestationwerecom- pared.Twosproutswereretainedforeachstumpintheregenerationundersproutmethod,andtheactua1densitywas1 170 p1ants·hm-2 afteraforestation;Therowspacingofthecutageforestationis4 m×3m,andtheaveragenumberis840 p1ants · hm-2 .Theresu1tsshowedthattheDBH,treheight,individua1vo1umeandunitvo1umeoftheregenerationun- dersproutmethodwere17.47cm,14.62m,0.1435m3 and167.93m3 · hm-2 ,respective1y,whichwere6 %,2%,14% and59% higherthanthoseofthecutageforestation.Theprofitperunitareawas26890yuan · hm-2 ,whichwasthre timeshigherthanthatof thecutageforestation.Insummary,xL-90pop1arissuitab1eforthecutageforestationin DongtingLakeareaduringshortrotation.