小叶榕秋季光合特性研究

采用Li-6400型便携式光合作用测定系统测定了小叶榕叶片的光合特性.结果表明：小叶榕的净光合速率日变化呈双峰曲线,存在光合“午休”现象.第一峰值均出现在10：00左右,第二峰值均出现在15：00左右.日最大净光合速率为4.72μmol/（m2·s）.净光合速率与蒸腾速率呈正相关,与胞间CO2浓度、气孔导度呈负相关.光饱和点为1 350 μmol/（m2·s）,光补偿点为85 μmol/（m2·s）,小叶榕具有一定的耐阴能力,是不耐强光的植物.

The Photosynthetic Characteristics of Ficus Microcarpa L.F.in Autumn

The photosynthetic character study of leaves in perennial evergreen arbor Ficus Microcarpa L.F. was determined with the Li-6400 Photosynthetic system.The results showed that the curve of daily of Ficus Microcarpa L.F. net photosynthetic rate was a double-peak curve and there was a clear depression at noon.Its first peak occurred at 10：00a.m, the second one at 15：00μm. The maximum of photosynthetic rate was 4.72 μmol/（m2·s）. Correlation analysis showed that there was positive relation between photosynthetic rate and transpiration rate. There was a negative relation between stomatal conductance and internal CO2 concentration. The light compensation was 85 μ mol/（m2·s）, its light saturation point was 1 350 μmol/（m2·s）. The light compensation and saturation point indicated that Ficus Microcarpa L.F. was a litter shade-resistant plant and it could not bear the glare.