冀北山地萌生白桦每丛合理保留株数的研究  

Study on Reasonable Remaining Number Per Tuft of Sprouting Birch in Mountainous Area in Northern Hebei Province

作　　者：张福[1] 吴昊[1] 

机构地区：[1]河北旅游职业学院,河北承德067000

出　　处：《安徽农业科学》2009年第10期4666-4667,4691,共3页Journal of Anhui Agricultural Sciences

摘　　要：[目的]为确定萌生白桦每丛合理保留株数提供参考意见。[方法]以河北省承德市白桦树为研究对象,调查萌芽林中龄时期（29年）每丛不同保留株数林木生长状况,并研究保留株数与伐桩直径及郁闭度的关系。[结果]林龄29年的萌生树已发育成独立的植株,其林分密度2 139株/hm^2,蓄积量73.5266 m^3/hm^2,平均直径9.61 cm,郁闭度0.8,平均株高11.5 m;林分平均直径随每丛保留株数的增加呈低-高-低的变化趋势;在3～5株丛密度下,薪材材积比与株数比分别为3.7%～4.3%和9.4%～14.3%。丛密度为5株时,薪材出现频率最高（62.5%）;伐桩断面积D0与生长于其上的萌生树胸高断面积之和的回归方程为G1.3=67.5565＋0.4374D0（r=0.7341〉r0.01）。丛密度与郁闭度呈极显著负相关（P〈0.01）。[结论]萌生白桦每丛保留株数应视伐桩直径和周边郁闭度大小而定,一般3～5株/丛较适宜。[Objective] The aim was to provide the reference for the determination of reasonable remaining number per tuft of birch in mountainous area in northern Hebei.[Method] With birches in Chengde City of Hebei as the researched object,the growth condition of middle age birches（29 a） with different remaining number per tuft were investigated and the relationship between remaining number per tuft with stump diameter and canopy density were investigated.[Result] The sprouting birch with forest age of 29 a had became independent tree already.And their stump density,volume,average diameter,canopy density and average plant height were 2 139 plant/hm2,73.526 6 m3/hm2,9.61 cm,0.8 and 11.5 m resp.The stump diameter showed low-high-low trend with the increase of remaining number per tuft.When the tuft density was 3-5 plants,the ratios of volume and plant number of fuelwood were 3.7%-4.3% and 9.4%-14.3% resp.When the tuft density was 5 plants,the occurrence frequency of fuelwood was the highest（62.5%）;the regression equation of cutting stake basal area D0 with the sum of breast height and basal area of sprouting tree on cutting stake was G1.3=67.556 5＋0.437 4D0（r=0.734 1〉r0.01）;The tuft density an canopy density had very relative with the canopy density（P〈0.01）.[Conclusion] The remaining number per tuft of sprouting birch should be determined according to basal diameter of cutting stake and canopy density around,generally,the suitable tuft density was 3-5 plans.

关 键 词：白桦 每丛保留株数 郁闭度 

分 类 号：S792[农业科学—林木遗传育种]