3个不同桃品种光合特性的研究

Photosynthetic Characteristics of 3 Different Species of Peach Trees

在大田条件下通过测定3个不同品种桃树(大久保、美香桃和桃王九九)的光合特性,对3个不同品种的桃树进行光合特性的研究和测定,包括净光合速率(Pn)、蒸腾速率(E)、气孔导度(Gs)、光合有效辐射(PAR)、细胞间隙CO_2浓度(Ci)及温度等,分析了不同品种光合特性的差异。结果表明:桃王九九的Pn值在一天中最高,其次是美香桃,大久保较低。桃王九九的E值在一天中最高,其次是美香桃,大久保值也较低。桃王九九的净光合速率显著高于大久保,美香桃与其他两个品种差异不显著。桃王九九的蒸腾速率也显著高于其他两个品种;桃王九九的气孔导度较高,美香桃次之,大久保最低。光合有效辐射、细胞间隙CO_2浓度、叶表面温度、相对湿度和进气CO_2浓度的日变化,3个桃品种的差异不显著。

This experiment studied photosynthetic characteristics of peach trees with 3 different species in the field, they are Richuan- baifeng, Hokkaido and King 99. The item includes net photosynthetic rate （Pn）, evaporation rate （E）, Gs, photosynthetic active radia- tion （PAR）, the gap of cell of density of COz （Ci） and air temperature etc. The difference of photosynthetic characteristics of different species were compared. The result showed that the Pn of King 99 of peach trees was highest in the day, Hokkaido was second, and Richuanbaifeng was the lowest. The E of King 99 of peach trees was highest in the day, Hokkaido was second, and Richuanbaifeng was also the lowest. Net photosynthetic rate of King 99 of peach trees was higher than Richuanbaifeng, Hokkaido was not obviously relative to net photosynthetic rate （Pn） with two other species. E of King 99 of peach trees were also obviously higher than two other species. Gs of King 99 of peach trees was higher than that of two other species, Hokkaido was second, and Richuanbaifeng was the lowest. There were no significant different of PAR, Ci ,temperature of leaf, hr and Ca changed in the day among 3 different species of peach trees.