The differences of leaf index between Al and A2 or A3 were significantat 0.01 level, While A2 and A3 at 0.05 level except in the seedling period.

• 叶面积指数随着密度和施肥量的增加而增加，密度间A1与A2、A3差异达到0.；01显著水平，A2与A3除了苗期外都达到0