不同郁闭度和海拔高度对海南风吹楠叶片及生长指标的影响

为探究不同回归方式对海南风吹楠（Horsfieldia hainanensis Merr.）生长的影响，通过不同海拔（300、600、900 m）和不同郁闭度（0～0.2、0.3～0.5、0.6～0.8、>0.8）对3年生海南风吹楠进行回归种植，观测其生长指标、叶性和叶型的变化。结果显示:（1）>0.8郁闭度回归种植能显著降低海南风吹楠株高、地径、叶长（LL）、叶宽（LB），对光合色素等指标无显著影响；（2）600 m海拔处理组能显著增加株高、叶片含水量（C_LWC）、比叶面积（S_LAM）、叶绿素b（Chl b），对叶型指标无显著性差异。试验结果表明，600 m海拔和低郁闭度（0.3～0.8）回归种植有益于3年生海南风吹楠的生长。

Effects of Different Canopy Closures and Altitudes on the Leaves and Growth Indexes of Horsfieldia hainanensis Merr. reintroduced

In?order?toTo?explore?the?impact?of?different?reintroduction?methods?on?the growth of Horsfieldia. hainanensis Merr., three-year-old trees of H. hainanensis?Merr.?were reintroduced intoo the areas for planting at different altitudes (300,?600,?900?m) under different canopy closures?(0～0.2, 0.3～0.5, 0.6～0.8,?>0.8) to observe the changes in their growth indicators,?leaf?traits?and?leaf?shape. The results showed that higher canopy closure (>0.8) significantly reduced the plant height, ground?diameter, leaf length (LL) and leaf width (LB) of?H. hainanensis?Merr reintroduced, but had no significant effect on photosynthetic pigments and other indicators. The altitude of 600 m significantly increased the plant?height, leaf?water?content?(C_LWC), specific leaf area (S_LAM), chlorophyll b (Chl b) of H. hainanensis?Merr. reintroduced, and there was no significant difference?in leaf shape. It is concluded that? the ?altitude of 600?m?and the low canopy closure (0.3～0.8) is beneficial to the growth of the 3-year-old trees of H. hainanensis Merr. reintroduced, which provides a reference for the effective conservation and restoration?of?H. hainanensis?Merr.