综合疏伐技术对中幼林抚育的影响

Effects of Comprehensive Thinning Techniques on the Tending of Young and Middle Aged Forests

分析综合疏伐技术对中幼林森林培育的积极影响。选取巨野县国有独山林场0.89万hm^(2)幼龄林和0.94万hm^(2)中龄林作为抚育对象,采用综合疏伐技术(简称疏伐组)。另外选取相同面积且不开展森林抚育的幼龄林和中龄林作为对照组,对比两个样地林木平均胸径、林木高度、蓄林木积量、林木(Reineke)密度指数等指标。疏伐组经过抚育间伐后,林木平均胸径(12.52±0.17)cm、林木高度(7.34±0.42)m、林木蓄积量(294.63±6.87)m^(3)/hm^(2)均明显高于对照组,差异有统计学意义(P<0.05);疏伐组生态疏伐后林木平均胸径(13.48±0.21)cm高于对照组(10.56±0.14)cm,且林木(Reineke)密度指数(432.473±17.412)低于对照组(641.271±15.427),差异有统计学意义(P<0.05)。综合疏伐技术能够提高中幼林抚育效果,建议推广应用。

To analyze the positive effects of comprehensive thinning techniques on the cultivation of young and middle-aged forests.The 8900 hm^(2) young forest and 9400 hm^(2) middle aged forest in the state-owned Dushan Forest Farm of Juye County were selected as the tending objects,and the comprehensive thinning technology(abbreviated as thinning group)was adopted.In addition,young and middle aged forests with the same area and without forest tending are selected as the control group to compare the average diameter at breast height,height of trees,volume of stored trees,and density index of trees(Reineke)in the two sample plots.The mean DBH(12.52±0.17)cm,height(7.34±0.42)m,and stock volume(294.63±6.87)m^(3)/hm^(2) in thinning group were significantly higher than those in control group after tending and thinning(P<0.05);After ecological thinning,the average DBH(13.48±0.21)cm of trees in the thinning group was higher than that in the control group(10.56±0.14)cm,and the density index of trees(Reineke)(432.473±17.412)was lower than that in the control group(641.271±15.427),the difference was statistically significant(P<0.05).The comprehensive thinning technology can improve the effect of young and middle aged forest tending,and it is suggested to be popularized.