东南沿海不同相思树种叶绿素荧光特性的季相变化

以东南沿海防护林6种相思树种为研究对象，通过跟踪测定其不同季节叶绿素荧光参数，进一步评价各树种对沿海沙地气候环境的适应能力。结果显示：卷荚相思夏季和冬季PSⅡ最大光能转化率和潜在活性均低于春季和秋季，表明夏季高温干旱和冬季低温均会制约其生长；大叶、厚荚及马占相思冬季PSⅡ最大光能转化率和潜在活性较小，生长状况较差；肯氏相思和纹荚相思的Fv／Fm及Fv／Fo值冬季相对较高，其中季节更替对肯氏相思Fv／Fm及Fv／Fo，值变化影响最小，整体生长状况较好。结合林分生长情况可知，大叶、厚荚及马占相思对东南沿海沙地环境适应能力较差；肯氏相思和纹荚相思能够适应沿海防护林的复杂环境，具有较高的推广种植潜力。

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 grow- ing 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 tempera- ture 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.