Density effects on the growth of self-thinning Eucalyptus urophylla stands

作者：Xue, Li^*; Pan, Lan; Zhang, Rou; Xu, Peng-bo

来源：Trees - Structure and Function, 2011, 25(6): 1021-1031.

DOI：10.1007/s00468-011-0576-4

• Allometric relationship
• C-D effect
• Eucalyptus urophylla
• Tree organ
• Self-thinning

Density effects on the growth of self-thinning Eucalyptus urophylla stands were examined for 7 years. Tree height and stem diameter at breast height were measured during the experimental period. Stems, branches, leaves, bark and roots of 45 E. urophylla trees were sampled in three different density stands in order to establish their biomass equations. Change trends of the biological time tau and density rho were described used corresponding equations. The stem weight ratio increased and leaf weight ratio decreased, whereas those of branch, bark and root were relatively steady from 2 years after the planting. The competition-density (C-D) effect equation of mean organ weight w(o) was derived by combining the allometric power relationship between mean tree weight w and w(o) with the C-D effect equation of self-thinning stands. The equations of the C-D effect for w and rho and for w(o) and rho were used to describe the C-D effects in tree and organs during course of self-thinning, respectively, and showed a good fit to the data. Leaf biomass of different density stands reached a more or less constant level with time elapse. High density produced the greatest biomass and stem biomass, so that it is the best choice in silvicultural practice.

• 出版日期2011-12
• 单位华南农业大学