红枣光合特性与水分利用效率日变化研究

Research on Diurnal Variations of Photosynthetic Characteristics and Water Use Efficiency of Zizyphus jujube

通过对新疆农一师九团栽植5年树龄的红枣进行光合特性与水分利用效率日变化研究。结果表明:枣树叶片的Pn、Tr、Gs在日变化过程中均呈单峰曲线,但峰值出现的时间并不一致。峰值分别为21.2μmol.m-2.s-1、4.33 mmol.m-2.s-1、286.5mol.m-2.s-1,出现的时间为13:00、13:00和11:00。Ci的日变化曲线基本与Pn相反,9:00开始降低,11:00左右达到最低值,而Ls的日变化曲线基本与Pn相同,当Ci升高时Ls降低。WUE最高值为5.37μmolCO2.mmol-1H2O,出现在上午9:00,此后随着蒸腾速率的持续上升,水分利用效率开始下降。

The variations of photosynthetic characteristics and water use efficiency of Zizyphus jujube in 9 Mission of the first farming army of Xiugjiang were studied. The results showed that diurnal variations of Pn , Tr and Gs of Zizyphus jujube leaves all took on a curve with one summit, but the emerging time of summit was different. Summit of Pn was 21.2 μmol ·m ^-2 , s^ -1 summit of Tr was 4.33 mmol · m^ -2 . s^- 1, summit of Gs was 286.5 tool ·m ^-2 . s ^-1, and their emerging time each was 13：130 Pro, 13：00 Pm and 11：130 Am. The curve of diurnal variations of Ci was contrary to Pn, it began decreasing at 9：00 Am and reached low at 11：00 Am, but the curve of diurnal variations of Ls was same to Pn. When Ci was increasing,/z was decreasing. The summit of WUE was 5.37 μmol CO2 · mmol＆-1 H2O, it emerged at 9 ： 00 Am. After this, WUE began decreasing with Tr increasing.