华山松和油松冠型结构对林窗式疏伐的响应

Crown Structure Responses of Pinus armandi and Pinus tabuliformis to Gap-model Thinning

【目的】研究30a生华山松和油松混交人工林中,边界华山松和油松冠型结构对林窗式疏伐的响应。【方法】评估华山松和油松偏冠程度、偏冠精度、冠长对小林窗(80m^2)和中林窗(110m^2)的响应。【结果】中林窗边界华山松和油松偏冠率明显高于对照,偏冠方向与林窗中心连线方向显著相关。两个树种偏冠程度和精度没有显著差异。华山松和油松正对林窗中心一侧冠长明显高于对侧,冠长比均约为0.1。【结论】华山松和油松具有相似的冠可塑性,林窗形成后,通过冠水平和垂直扩展,增加光获取,加速自身生长。

【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 m^2 and110m^2）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.