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以36种8年生欧美观赏海棠为研究对象,测量其树高和地径指标,用CIRAS-2光合仪测定并计算其净光合速率Pn、饱和光强SL、光补偿点LCP、暗呼吸速率Rd、表观量子效率AQY等光合参数,以了解供试海棠的光合生理特性。结果显示,供试欧美观赏海棠树高和地径生长量、光合生理特性存在明显差异。在36种海棠中,‘奈微利考伯曼’、‘珠穆朗玛’和‘红丽’等9种海棠Pn较高,对应树高和地径也表现出较大生长量;‘珠穆朗玛’和‘奈微利考伯曼’等8种海棠SL较高,表明对强光的适应性较强,为喜光性品种;‘印第安魔力’和‘绚丽’海棠AQY最高,说明其叶片转化光能的效率高,并且对弱光的利用能力较强。这些数据为欧美观赏海棠在园林绿化中的合理配置与栽培提供了理论依据。
36 species of 8-year-old European and American ornamental begonias were taken as the research object to measure their height and diameter index. The net photosynthetic rate Pn, saturated light intensity SL, light compensation point LCP, dark respiration rate Rd , Apparent quantum yield AQY and other photosynthetic parameters to understand the photosynthetic physiological characteristics of Begonia. The results showed that there were significant differences in tree height, diameter growth and photosynthetic physiological characteristics between the European and American ornamental begonias. Among the 36 Begonias, Pn of 9 kinds of Begonia, such as ’Niuyuli Cooperman’, ’Mount Qomolangma’ and ’Hongli’, showed higher Pn and larger growth corresponding to tree height and diameter. Microlevel Cooper ’and other 8 kinds of Begonia SL higher, indicating strong adaptability to glare for the hi-light varieties;’ Indian magic ’and’ brilliant ’Begonia AQY highest, indicating that the efficiency of leaf light conversion efficiency, And the ability to use weak light stronger. These data provide the theoretical basis for the rational allocation and cultivation of begonia in the landscape in Europe and the United States.