不同抚育间伐强度对杉木林生长的影响

Effects of Different Tending and Thinning Intensities on the Growth of Cunninghamia lanceolata Forests

[目的]研究不同抚育间伐强度对杉木生长的影响,为杉木林分生长状况的改善提供理论参考。[方法]主要以茅栗坑山场9块样地为试验地,以1/3、1/4、1/53种抚育间伐强度各做3次重复的抚育管理,对2018、2019年样地内单株进行每木检尺,研究不同抚育间伐强度对杉木胸经、树高、蓄积、单株林积的影响。[结果]抚育间伐对林分生长有明显的促进作用,随着抚育间伐强度的增加,林分的平均胸径、单株材积、蓄积的相对增长量也随之增加,其中1/3抚育间伐强度下增长最多,分别达到9.97%、27.64%、27.78%;平均树高相对增长量先下降后增加,在1/3抚育间伐强度下增长最多,达到4.88%。[结论]抚育间伐可以促进林分生长,提高林分质量,可以实现木材的早期利用及总利用量。

[Objective]To study the effects of different tending and thinning intensities on the growth of Cunninghamia lanceolata,so as to provide theoretical reference for the improvement of the growth status of Cunninghamia lanceolata stand.[Method]Nine sample plots in Maolikeng Mountain Farm were used as experimental plots,and tending management was repeated three times with three tending intensifications,1/3,1/4 and 1/5,respectively.During this period,each plant in the 2018 and 2019 sample plots was checked per wood scale.The effects of tending thinning intensity on DBH,tree height,volume and single plant volume of Cunninghamia lanceolata were studied.[Result]The experimental results showed that tending thinning had obvious promoting effect on the growth of stand.With the increase of tending intensities,the average DBH of stand,the relative growth amount of wood volume per plant and the accumulation increased,and the 1/3 tending intensity increased the most,reaching 9.97%,27.64%and 27.78%respectively.The relative growth of average tree height decreased first and then increased,and the maximum growth reached 4.88%under 1/3 tending intensity.[Conclusion]Tending thinning can promote the growth of the stand,and the early utilization and total utilization of wood can be realized through the experiment to find suitable tending intensity of the local stand and improve the quality of the stand.