摘要
为揭示西南桦人工林生长规律,为西南桦人工林的经营管理提供科学依据,采取定点定株连续观察法研究广西百色市靖西县五岭林场西南桦人工林生长过程。结果表明,15a生西南桦人工林树高、胸径、材积分别达到19.7m、20.2cm、0.315 5m~3·株~(-1)。幼林的树高和胸径生长量随树龄增长而增大,5a生达到高峰,之后随树龄增长而下降。材积连年生长量、年均生长量分别在第5年和第13年达到高峰。材积连年生长率与年均生长率曲线在14a相交,表明西南桦数量成熟年龄为14a。西南桦林分的枝下高随树龄增长而增大,自然整枝高峰期在6~7a。
In order to reveal the growth law and provide scientific basis for the management of Betula alnoides plantation,the growth process of B.alnoides plantation was studied by fixed point,fixed plant and consecutive observation in Wuling Forest Farm of Baise,Guangxi.The results showed that individual tree height,DBH and volume of 15-year-old B.alnoides were 19.7m,20.2cm and 0.315 5m~3,respectively.The height and DBH increased with age,and reached the peak at the 5th year,then decreased with the age.The annual increment volume and annual average growth volume reached the peak at the 5th and 13 th year,respectively.The intersecting curve of volume successive-year growth percentage and annual average increment percentage appeared at the 14 th year,which indicated that B.alnoides quantitative mature age was 14 years.The clear bole height increased with the age,and the natural pruning peak appeared at 6-7years.
引文
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