抚育间伐对华北落叶松人工林生长的影响

为确定华北落叶松人工林合理的间伐强度和具体的抚育措施,对不同抚育间伐强度下华北落叶松人工林林木胸径、单位面积蓄积量的变化进行了研究。结果表明,随着间伐强度的加大,林木生长的指标胸径和蓄积量均呈上升后平缓的趋势;平均胸径的生长量变化依次为,间伐强度40%>间伐强度60%>间伐强度20%>间伐强度0;平均蓄积量的生长量变化依次为,间伐强度60%>间伐强度40%>间伐强度20%>间伐强度0。通过综合分析抚育的效果,保留蓄积为90～145m3/hm2(间伐强度40%～60%)的样地内抚育效果表现最好。

Effects of tending thinning on the growth of Larix principis-rupprechtii plantation in Saihanba area

Different tending thinning intensities of Larix principis-rupprechtii plantation affecting its DBH and per unit volume changes are discussed.The results show that the growth index of DBH and volume tends to increase and then remain gentle with the increase of forest thinning intensity;the average DBH increases in order of thinning intensity 40%thinning intensity 60%thinning intensity 20%thinning intensity 0 and the average volume increases in order of thinning intensity 60%hinning intensity 40%thinning intensity 20%thinning intensity 0.The comprehensive analysis of tending effect reveals that the plots with the retention volume of 90～145m3/hm2（at thinning intensity40%～60%） in tending perform the best.This research provides theoretical references for the determination of rational thinning intensity and specific management measures of Larix principis-rupprechtii plantation.