施氮对干旱区两种枸杞光合日变化和产量的影响

为阐明施氮对枸杞的光合日变化特性及产量的影响,选择黑果枸杞(Lycium ruthenicum)和宁夏枸杞(Lycium barbarum)两个物种,设置0(CK)、50(F1)、100(F2)、150(F3)和200(F4)g·株-1共5个施氮处理,研究移栽至干旱区甘肃省武威市的黑果枸杞和宁夏枸杞的净光合速率(net...

Effects of Nitrogen Application on Diurnal Variation of Photosynthesis and Yield of Two Lycium Species

In order to clarify the effect of nitrogen application on diurnal variation of photosynthesis and yield of Lycium species, Lycium ruthenicum and Lycium barbarum were selected and 5 nitrogen application treatments including 0(CK), 50(F1), 100(F2), 150(F3) and 200 (F4)g·plant^-1 were set up. The net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs), intercellular CO2 concentration (Ci), instantaneous water use effiency (WUE), stomatal limitation (Ls) and yield of L. ruthenicum and L. barbarum transplanted to arid areas in Wuwei City, Gansu Province were studied. And the best nitrogen application amount was fitted from the perspective of photosynthesis increasing yield. The results showed that nitrogen application could increase Pn, Tr, Gs, WUE and yield of L. ruthenicum and L. barbarum in different time periods of 1 d, reduce Ci and Ls of the two Lycium species, thus increase their photosynthesis. The effect of nitrogen application on photosynthetic parameters of L. ruthenicum was more significant than that of L. barbarum. The daily average net photosynthetic rate (PnA) and yield of L. ruthenicum in F3 treatment were the highest, with 9.842 μmol·m^-2·s^-1 and 173.621 g, respectively. PnA of L. barbarum in F3 treatment was the highest, which was 11.616 μmol·m^-2·s^-1; its yield in F3 treatment was the highest, which was 205.264 g·plant^-1. Therefore, nitrogen application with 150 g·plant^-1 was beneficial to increase photosynthesis of L. ruthenicum and L. barbarum, thus could obtain the maximum yield.