【摘要】 采用1年生喜树Camptotheca acuminata苗为材料建立喜树叶用园,设置造林密度为1.0m×1.0 m(处理A为1.00万株.hm-2),0.5 m×1.0 m(处理B为2.00万株.hm-2),0.5 m×0.5 m(处理C为4.00万株.hm-2),0.3 m×0.5 m(处理D为6.67万株.hm-2),0.3 m×0.3m(处理E为11.11万株.hm-2)5个水平的密度试验,分析不同密度对喜树个体高、径生长,叶面积,叶片数和叶生物量等指标的影响。结果表明:①密度对苗高生长有一定影响,但没有明显规律,差异不显著(P>0.05)。②平均地径、单株叶面积和单株叶产量均随密度的增加而递减,不同密度间存在显著差异(P<0.05)。③密度对叶用园单位面积叶产量有显著影响(P<0.05),密度为1.00~4.00万株.hm-2范围内,单位面积叶产量随密度的增加而逐渐增加。之后,随密度的增加单位面积叶产量反而有所降低,以密度为4.00万株.hm-2条件下的单位面积叶产量为最大。图4表1参8更多还原

【Abstract】 A leaf-producing plantation of one-year old Camptotheca acuminata seedlings was established at five density levels:(A) 1.0 m × 1.0 m,(B) 0.5 m × 1.0 m,(C) 0.5 m × 0.5 m,(D) 0.3 m × 0.5 m,and(E) 0.3 m× 0.3 m with three replication,to study the effects of density on seedling height,seedling diameter,leaf yield per unit area,leaf number per seedling,and leaf biomass per seedling.The trial did in 2002.Results of the trial showed that(1) density produced no significant differences for average height growth.Also,(2) with increasing density,seedling diameter,per-seedling leaf area,and per-seedling leaf biomass significantly decreased(P<0.05)(yield of A < B < C < D < E).In addition,(3) as density increased from A to C,leaf yield per unit area increased(P<0.05)(leaf yield of A < B < C),while as density further increased from C to E,leaf yield decreased(leaf yield of C > D > E).Thus,for one-year old seedlings of C.acuminatain this trial,the highest leaf yield per unit area could be expected when density E(0.3 m × 0.3 m) is used.更多还原