| The potted one-year-old seedlings of several tree species were tested to study their responsive characteristics to drought stress. The tree species include the followings: Tilia amurensis, two clones of Tilia t. 1 and 2, Acer truncatum, four clones of Acer c.3, 4, 5 and 6. Two methods, continuous drought stress and gradient water control were taken to measure the leaves'anatomic structures, growth, physiological and biochemical indexes of these seedlings, based on which evaluation indices system of drought resistance was established and tree species which had comparatively stronger abilities in resistance to drought were selected to provide scientific and theoretical basis for selecting afforestation tree species in arid mountain areas.The results were listed as follows: In Tilia,Tilia amurensis had thickest cuticle in lower epidermis, well developed palisade tissues, the highest ratio of palisade tissues thickness to spongy and the most compact structure of leaves, and then was Tilia t. 1 and 2. In Acer, Acer truncatum had the highest ratio of palisade tissues thickness to spongy; the most compact structure of leaves, the lowest loose degree of leaves structure and its xenomorphic characters was also marked. The ratio of palisade tissues thickness to spongy of Acer C.3 and 4 was the lowest and their leaves structures were the most compact. This indicated that their xenomorphic characters were not remarkable. The anatomic indexes of Acer C.5 and 6 were unanimous and they were between Acer C.3 and 4. There was a significantly positive relation between water-holding capacities of leaves and the ratio of palisade tissues thickness to spongy through correlation analysis on them. The dehydrating time of Tilia amurensis was the longest while its dehydrating rate was the lowest, thus it could be concluded that Tilia amurensis had the strongest anti-dehydrating ability and then did Tilia tomentosa 1 and 2. In Acer, Acer truncatum had the strongest... |
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