The Effect of Ac id and Alum inum Stress on Seed Germ ina tion andSeedling Growth of Pinus massoniana
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1.
Institute of Sivilculture and Ecology, Guizhou University, Guiyang 550025, Guizhou, China
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2.
Research Institute of Trop ical Forestry, CAF, Guangzhou 510520, Guangdong, China
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Received Date:
2006-03-14
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Abstract
The effect of acid and aluminum stress on seed germination and seedling growth of Pinus m asson ianaLamb. was studied on the substrates of quartz sand by compounding nutritive liquid commonly used intensively inthe world. The result showed thatmedium 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 andstem. There was a significant correlation between the growth of root and stem, dryweight, fresh weightwith intensity of acid and Al3+ stress. The seedling growth increased slowly at first and then decreased with pH value changingfrom 5. 5 to 3. 0, the seedling growth decreased with the increase of Al3+ . The seedling growth was op timal in the pHvalue of 4. 5~5. 0. The acid and Al3+ stress had the biggest influence on root, and rootwas 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 , whichcould restrain the growth of P. m assoniana sp rout distinctly.
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Proportional views
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