Abstract: With the seedlings of Dillenia turbinata, Peltophorum tonkinense, Garcinia oblongifolia, Alstonia scholaris, Khaya senegalensis and Ormosia pinnata as tested materials, this paper studied the effects of low temperature stress on their physiological characteristics. The results showed that under low temperature stress, the relative electrical conductivity of the seedlings had a slight increase. Except for P. tonkinense at 0 ℃, the free proline content in tested tree species seedlings treated with low temperature was higher than the control, but the soluble protein and chlorophyll contents fluctuated slightly. The MDA content in D. turbinate, G. oblongifolia and K. senegalensis seedlings increased with decreasing temperature, while that in other tree species seedlings changed slightly. Under low temperature stress, D. turbinata seedlings had a significantly higher SOD activity,P. tonkinense seedlings were in adverse, and the seedlings of other tree species changed slightly. Principal component analysis indicated that the cold resistance of tested tree species was in the order of O. pinnata>A. scholaris>K. senegalensis>G. oblongifolia>P. onkinense>D. turbinata.

Key words: Lichen biomass, Stocking rate, Plant community, Soil properties