By setting shading treatments with different light transmittances,the effects of shading treatments on the annual growth and afforestation preservation rate of seedling height,ground diameter and crown width of Picea cras-sifolia and Picea purpurea were carried out.The results showed that the growth,survival rate and preservation rate of Picea crassifolia and Picea purpurea were generally expressed as 30％light transmittance shading treatment group＞60％light transmittance shading treatment group＞90％light transmittance shading treatment group＞blank control group,indicating that shading treatment effectively improved the survival rate and preservation rate of afforestation.
维普
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