Effects of water stress on Tsuga longibracteata seedlings under varied light intensity

The seedling's livability,SOD activity,POD activity,content of photosynthetic pigment,MDA and Pro in the seedling leaves of Tsuga longibracteata were studied after being planted for 30 days at four different water content(30%,25%,20%,15%) under four light intensity environment(100%,50%,25%,10% full day light) from 2004 to 2005.The results showed that high light intensity(100% full day light) could enhance the injury of soil drought on seedlings of T.longibracteata,while shading could reduce it.Both high light intensity(100% full day light) and low light intensity(10% full day light) could enhance the injury of excessive soil water on the seedlings of T.longibracteata,but medium light intensity(50% and 25% full day light) could reduce it.Under medium light intensity(50% and 25% full day light) environment,the tolerance of seedlings of T.longibracteata on soil water stress was high.