杉木大径木培育林分立地选择及轮伐期研究  

Study on stand site selection and rotation period of large-diameter Chinese fir cultivation

作　　者：夏政 沈亚雄 张勰[3] XIA Zheng;SHEN Yaxiong;ZHANG Xie(Zhexi State-owned Forest Farm of Anhua County,Anhua 413508,Hunan,China;Zhexi National Forest Park Afairs Center,Anhua County,Anhua 413508,Hunan,China;Hunan Academy of Forestry,Changsha 410004,Hunan,China)

机构地区：[1]安化县柘溪国有林场,湖南安化413508 [2]安化县柘溪国家森林公园事务中心,湖南安化413508 [3]湖南省林业科学院,湖南长沙410004

出　　处：《湖南林业科技》2025年第2期35-41,共7页Hunan Forestry Science & Technology

基　　金：国家重点研发计划(2021YFD2201302)。

摘　　要：基于4个立地指数级的44年生杉木标准地调查及解析木数据,研究了杉木优势木和大径木的林分生长过程及轮伐期,以期为杉木大径木培育提供指导。结果表明:优势木的树高和胸径均随着立地指数级的增加而增加;当树龄为44a时,立地指数14、16、18、20的林分树高分别为19.8、22.3、24.8、27.6m,胸径分别为31.6、33.9、36.4、39.1cm。林分呈现出立地指数越高,生长速度越快的现象。4个立地指数级的大径木平均树高分别为17.7、18.8、20.0、21.8m,平均胸径分别为20.0、22.4、23.7、24.9cm,单位面积材积分别为118.1、256.1、333.3、497.3m^(3)·hm^(-2),大径木占比分别为28.1%、46.6%、50.7%、63.0%。综合评价确认,14指数级立地不宜培育杉木大径木,而18指数级及以上立地为理想用地。根据林分大径木材积连年生长量与年平均生长量的交叉时间点,确定立地指数16、18、20的林分的最佳轮伐期分别为38、36、34a左右。Based on the investigation and analysis of the data of 44-year-old Chinese fir standard plots with 4 site index levels,the growth process and rotation period of dominant trees and large-diameter trees were studied to provide guidance for the cultivation of large-diameter Chinese fir.The results showed that the height and DBH of dominant trees increased with the increase of site index.At the age of 44,the tree height of site index 14,16,18 and 20 were 19.8,22.3,24.8 and 27.6 m,respectively,and the DBH were 31.6,33.9,36.4 and 39.1 cm respectively.The higher the site index,the faster the growth rate of forest stand.The average tree height of large-diameter trees with 4 site index grades were 17.7,18.8,20.0 and 21.8 m,respectively;the average DBH were 20.0,22.4,23.7 and 24.9 cm,respectively;the volume per hectare were 118.1,256.1,333.3 and 497.3 m3,respectively;the proportion of large-diameter trees were 28.1%,46.6%,50.7% and 63.0%,respectively.Comprehensive evaluation confirmed that the site index 14 was not suitable for cultivating large-diameter Chinese fir trees,while the sites with an index of 18 or higher were ideal for cultivation.Base on the cross-time points between current annual increment and mean annual increment of large-diameter trees,the optimal rotation period of site index 16,18 and 20 were determined to be approximately 38,36 and 34 a,respectively.

关 键 词：杉木 大径木 优势木 立地选择 轮伐期 

分 类 号：S791.27[农业科学—林木遗传育种]