连栽对尾巨桉人工林生长量的影响

摘要

[目的]研究连栽对尾巨按人工林生长量的影响.[方法]对尾巨桉连栽林分和对照林分(第1代)的胸径、树高、蓄积量进行了比较.[结果]尾巨桉连栽林分的胸径、树高和蓄积生长量与对照林分相比,并没有表现出下降趋势,其蓄积生长量反而有所增加,但其连年生长量呈下降趋势,出现了早衰现象.[结论]连栽使尾巨桉人工林蓄积生长量增加,连年生长量下降.%[Objective] The aim was to understand the effects of continuous cropping on growth amount of Eucalyptus urophylla × E. Grandis plantation. [Method] The test comparative research with the DBH, tree height, growing stock of the Eucalyptus urophylla ×E. Grandis stand between continuous cropping with control(1st generation)was conducted. [ Result] The DBH, tree height and growing stock of Eucalyptus uro-phylla × E. Grandis increased constantly with the increasing of stand ages. The growth amount of DBH, tree height , growing stock of continuous cropping stand compared with control stand didn't decrease, even the growth of growing stock increased, but the annual growth amount declined , and the phenomenon of premature appeared. [ Conclusion] Continuous cropping made the Eucalyptus urophyUa x E. Grandis plantation growing stock increase and the annual growth amount decline.