黑樱桃与山樱桃幼苗光合作用的比较研究
Comparison on the Photosynthesis of Seedlings ofPrunus serotina and Prunus serrulata
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摘要: 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。Abstract: W ith L I??6400 portab le photo synthesis systems, the net photosynthet ic rate ( Pn ) , stom ata l conduct??ance ( G s ) and in terce llu lar CO2 concentra tion ( C i ) under natura l full light cond itions w ere compared forP runus serru lata from Guang shan C ounty , H enan Prov ince, P. serotina from Pennsy lvan ia and On tario. The re??sults show ed that: ( 1 ) P. serrula ta had the max imum da ily averag e amoun t of Pn, Gs, and Ci, w h ich w ere6. 381??mo l·m- 2 ·s-1, 0. 200 mo l·m- 2 ·s-1, and 251. 7 ??mo l·mo l- 1 respect iv ely, and the average a??moun ts of seedling s o f Pennsy lvan ia provenances w ere them ed ium, they w ere 5. 550 ??mo l·m- 2 ·s-1, 0. 151mo l·m- 2 ·s-1, and 234. 7 ??mo l·mo l- 1 respective ly, and the averag e amoun ts o f seed lings o fOn tario prove??nance w ere the least, they w ere 4. 952 ??mo l·m- 2 ·s-1, 0. 134 mo l·m- 2 ·s-1, and 230. 1 ??m ol·mo l- 1respective ly. ( 2) Pn, Gs and C i had sign ifican tly d ifferences among these species. ( 3 ) The da ily variat ion o fPn w as sim ilar, therew as on ly one peak of Pn in a day, bu t the Pn o f p lants of Pennsy lvan ia provenance reached the peak earlier than that o f the o ther tw o k inds of seedling s. The da ily var iation o fC i w as sim ilar, too. C i de??creased gradua lly from mo rn ing to them in imum in the a fternoon and increased a little la ter, bu t the Ci of plantsof Pennsylvan ia provenance fell them in imum earlier than that o f the o ther tw o k inds o f seed lings. The da ily va ri??at ion o fG s w as sim ilar, too.
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