关键词: 偏冠, 冠长, 林窗大小, 边界木, 混交人工林

Abstract: [Objective] The purpose of this study was to explore crown structure responses of gapedged Pinus armandi and Pinus tabuliformis to gap-model thinning in a 30-year-old mixed pine plantation(P. armandi and P. tabuliformis). [Method] The influences of gap size(80 m² and 110 m²) on magnitude and precision of crown displacement and crown length were assessed. [Results] The relative crown displacement of P. armandi and P. tabuliformis adjacent intermediate gaps were significantly higher than those in the control trees, crown displacement towards the gap centers. There were no significant differences in the magnitude and precision of crown displacement between two species. Crown length of both species were significantly greater on the gap-facing sides of trees than on the forest-facing sides of trees, with a crown length ratio of 0.1. [Conclusion] The results indicated that that P. armandi and P. tabuliformis had a similar crown plasticity. Moreover, the horizontal and vertical growth of crown has more accessory to light resource and increase their growth after gap creation.

Key words: crown displacement, crown length, gap size, gap-edge trees, mixed plantation