The Effect of Acid and Aluminum Stress on Seed Germination and Seedling Growth of Pinus massoniana

The effect of acid and aluminum stress on seed germination and seedling growth of Pinus massoniana Lamb.was studied on the substrates of quartz sand by compounding nutritive liquid commonly used intensively in the world.The result showed that medium intensity of acid and Al3+ did not have significant influence on germination rate and germinating ability,while they had significant negative influence on the growth of seedling root and stem.There was a significant correlation between the growth of root and stem,dry weight,fresh weight with intensity of acid and Al3+ stress.The seedling growth increased slowly at first and then decreased with pH value changing from 5.5 to 3.0,the seedling growth decreased with the increase of Al3+.The seedling growth was optimal in the pH value of 4.5～5.0.The acid and Al3+ stress had the biggest influence on root,and root was the most sensitive part.The percentage of biomass of root decreased with the increasing stress of acid and Al3+,both stem and leave fluctuated lesser.When pH value was under 4.5 of nutritive liquid,the concentration of Al3+ was 50 mg·L-1,which could restrain the growth of P.massoniana sprout distinctly.