中文摘要：

采用Li-6400型便携式光合测定系统,对福建东山岛不同海岸线距离木麻黄的光合生理特征动态变化进行定位观测.结果表明：海岸线距离对木麻黄光合生理特征动态变化具有显著影响；第1海岸梯度木麻黄净光合速率日变化呈“单峰”曲线,其他各梯度的呈“双峰”曲线,第2海岸梯度的日平均值高于其他梯度；第1、2、3海岸梯度木麻黄净光合速率季节变化呈“双峰”曲线,第4海岸梯度的呈“单峰”曲线,第2海岸梯度的季节平均值高于其他梯度.第1海岸梯度上木麻黄小枝的叶绿素含量最低,第2海岸梯度的最高.随着海岸线距离的变化,木麻黄光补偿点在10-60 μmol·m-2·s-1之间,光饱和点在70-500 mol·m-2·8-1之间,第2海岸梯度上的木麻黄对光的利用范围最宽；C02补偿点在13-19 μmol·m-2·s-1之间,CO2饱和点在1 500-1 800 mol·m-2·s-1之间,不同海岸线距离的木麻黄对CO2浓度的利用范围均较宽.

英文摘要：

The dynamic change in photosynthetic characteristics of Casuarina equisetfolia across coastal gradients is measured by Li-6400 portable photosynthesis system. The result shows that coastal gradient has a significant effect on the dynamic change of photosynthetic characteristics of C. equisetfolia. The diurnal variation of photosynthetic rate takes the shape of single-peak curve at the first gradient but the shape of double-peak curve at other gradients, and the mean value of diurnal variation at the second gradient is the highest. The seasonal variation of photosynthetic rate at the first, second and third gradient takes the shape of double- peak curve but the shape of single-peak curve at the fourth gradient, and the mean value of seasonal variation at the second gradient is the highest. C. equisetfolia at the first gradient has the lowest contention of the chlorophyll, while it at the second graclient has the highest contention. The light compensation points and the light saturation points of C. equisetfolia at different gradients are between 10 to 60 μmol·m-2·s-1 and between 70 to 500 μmol·m-2·s-1 respectively, and the applied range of light intensity used by C, equisetfolia is most widely at the second gradient. The CO2 compensation points and the CO2 saturation points are between 13 to 19 μmol·m-2·s-1 and between 1 500 to 1 800 μmol·m-2·s-1 respectively, and the applied range of CO2 concentration used by C. equisetfolia is wide at all gradients.