Effect of Different Ratio of Light Media on Growth of Picea likiangensis var. rubescens Seedlings

In April of 2014, experiments were conducted on container seedling cultivation of Picea likiangensis var. rubescens with different ratio of light media,namelyP1(peat:sawdust:pearlite=4:5:1),P2(peat:sawdust:pearlite=5:4:1),P3(peat:sawdust:pearlite=6:3:1), P4 (peat:sawdust:pearlite=7:2:1), P5 (peat:sawdust:pearlite=8:1:1), and local soil as control. Determinations were implemented in April of 2016 on growth traits of seedlings. The result showed that seedling on different ratio of light media had larger height growth and ground diameter than CK ,especially on P3, P4 and P5. The aboveground and underground biomass of seedlings on different ratio of media were significantly higher than CK, especially on P3 and P4, and the underground biomass of that on P4 and P5 were larger than the others.The root growth including root surface area, root length, root tip number, root biomass and root activity of seedlings on different ratio of light media was significantly better than that on CK. That on P4 had the largest root surface area, on the P4 and P5 had the longest root length and root tip number, that on P3 had the largest root activity. It showed that root growth had significant positive correlation with aboveground grwoth. Integrated analysis concluded that P3 was the best media for cultivation of container seedling of P. likiangensis var. rubescens.