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５种密度（４、７．９、１４．３、１６．９、３０株／ｍ２）香椿播种苗密度试验表明，香椿苗木对密度的生态对策与一般树种不同。高密度只对地径生长有明显的抑制作用，在４～３０株／ｍ２的范围内，地径随着密度的增加而减小，而苗高则随着密度增加有增有减。高径比是合格苗的重要指标，其值不得超过６０。在试验密度范围内，苗茎生物量是渐增的，但有效生物量以７．９株／ｍ２为最高。育苗合理密度为８株／ｍ２左右。在合理密度、合理生产管理条件下，可保证８０％的苗木合格。
Five kinds of density (4, 7.9, 14.3, 16.9, 30 plants / m2) sowing seedling density test showed that the ecological measures of toon seedling density and general tree species are different. The high density only had a significant inhibition on the diameter growth. In the range of 4 ~ 30 plants / m2, the diameter decreased with the increase of density, while the height increased with the increase of density. Height-diameter ratio is an important indicator of qualified seedlings, the value of not more than 60. In the experimental density range, seedling stem biomass is increasing, but the effective biomass to 7.9 strains / m2 is the highest. Seedling reasonable density of 8 plants / m2 or so. In a reasonable density, reasonable production and management conditions, can guarantee 80% of the seedlings qualified.