【摘要】 为了探明成年桃树不同朝向枝条叶片的光合作用特点，在桃果实成熟期间（6月中旬），分别于10:00和15:00测定了桃品种春美的东、南、西、北以及中部共5个方位叶片的光合特性。结果表明：桃叶片在10:00的光合效率总体高于15:00的，不同方位桃叶片在10:00的光合效率表现为南部>东部>北部>西部>中部叶片，在15:00的光合效率表现为南部>西部>北部>东部>中部叶片；在10:00不同方位叶片的气孔导度表现为北部>东部>南部>西部>中部叶片，在15:00气孔导度表现为西部>北部>东部>南部>中部叶片。总之，光照强度直接影响桃叶片的光合效率，温度影响桃叶片的蒸腾作用和呼吸作用，改变气孔导度，导致光合效率日变化的发生及不同朝向叶片光合特性的差异。更多还原

【Abstract】 In order to investigate the photosynthesis characteristics of the leaves of adult peach trees in different orientations, the photosynthetic characteristics of the leaves of the ‘Chunmei’ peach in the east, south, west, north and central part were measured at 10:00 in the morning and 15:00 in the afternoon during the fruit ripening period(mid-June). the results showed that the overall photosynthetic efficiency of peach leaves at 10:00 in the morning was higher than that at 15:00 in the afternoon. The order of the photosynthetic efficiency at 10:00 was south>east>north> west>central. The photosynthetic efficiency was highest in the south at 15:00, followed by the west, north and east respectively, and the lowest in the central leaves.At 10:00, stomatal conductance of leaves in different orientations was in the order of north>east >south>west>central,and stomatal conductance was in the order of west > north > east > south > central at 15:00. In conclusion, light intensity directly affects photosynthetic efficiency. Temperature affects leaf transpiration and respiration, changes stomatal conductance,and causes daily changes in photosynthetic efficiency and differences in photosynthetic characteristics of leaves in different orientations.更多还原