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

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

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。

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.