用LI??6400 便携式光合作用系统对美国黑樱桃、加拿大黑樱桃、中国山樱桃苗木的净光合速率、气孔导度、胞间CO2浓度等进行了比较测定, 结果表明: ( 1) 日平均净光合速率、气孔导度和胞间CO2浓度均是中国山樱桃最大、美国黑樱桃居中、加拿大黑樱桃最小。3 种苗木的净光合速率分别为6. 381 ??m o l?m-2 ?s-1、5. 550 ??m o l?m-2 ?s-1、4. 952 ??m o l?m-2 ?s-1, 气孔导度分别为0. 200 m o l?m- 2 ?s-1、0. 151 m o l?m- 2 ??s-1、0. 134 m o l?m-2 ?s-1, 胞间CO2浓度分别为251. 7 ??m o l?m o l- 1、234. 7 ??m o l?m o l- 1、230. 1 ??m o l??m o l- 1。( 2) 3种苗木的净光合速率、气孔导度、胞间CO2浓度均有显著差异。( 3) 3种苗木净光合速率的日变化相似, 都呈单峰曲线, 但美国黑樱桃达到峰值的时间在上午10时, 早于加拿大黑樱桃和中国山樱桃, 后两者达到峰值的时间都在中午12时。胞间CO2浓度的日变化都是从早晨开始逐渐下降, 到下午降低到最小值, 然后又有所增加, 所不同的是, 美国黑樱桃苗木下降到最小值的时间较早, 在14时, 而中国山樱桃和加拿大黑樱桃则较迟, 都在16时。气孔导度的日变化趋势相似。
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