Seasonal Variation of Chlorophyll Fluorescence Parameters of Different Species from Genus Acacia in Southeast Coastal Area

The adaptability to the climate and coastal sand environment of six species from genus Acacia growing in the coastal shelterbelt in southeast China was evaluated by successive determination of the seasonal change in chlorophyll fluorescence parameters of each specie. The results showed that the maximum light conversion efficiency of PSII and its potential activity of Acacia cincinnata in the summer and winter seasons were lower than those of in the spring and autumn, indicating that either the high temperature and drought in the summer or the low temperature in the winter would restrain the growth of A.cincinnata. The maximum light conversion efficiency of PSII and the potential activity of A.crassicarpa, A.auriculiformis and A.mangium were relatively lower, and these species grew poorer than the others. The Fv/Fm and Fv/Fo values of A.cunninghamii and A.aulacocarpa were relatively higher, while these indexes were not much influenced by the change in seasons,so these two species generally grew well in the studied area. Combined with the plantation growth status composed of these species, it was concluded that the adaptability of A.crassicarpa and A.auriculiformis to the coastal sand environment in southeast China was relatively poorer,whereas the A.cunninghamii and A.aulacocarpa could better adapt to the complex environment of the coastal shelterbelt,there would be a great potential to extend the planting scale for these species.