Effect of Salt Stress on Diurnal Variation of Photosynthesis of Nitraria tangutorum and Tamarix chinensis
In order to select salt-tolerant plants for planting in saline soil, 2-year-old Nitraria tangutorum and Tamarix chinensis were used as experimental materials, NaCl concentration gradient was set as 0(CK), 100 (Y1), 200(Y2), 400(Y3), 600(Y4) mmol/L, and photosynthetic diurnal variation was studied under sah stress.The results showed that: (1) the variation trend of the average photosynthetic rate (Pn) of Nitraria tangutorum and Tamarix chinensis under salt stress condition and non-salt stress condition were basically the same;(2) the photosynthetic ability of Nitraria tangutorum was stronger than that of Tamarix chinensis;(3) the decline rate of average daily net photosynthetic rate (Pn) and carboxylation efficiency (CE) of Nitraria tangutorum was greater than that of Tamarix chinensis with the increase of salt concentration;the water use efficiency (WUE) of Tamarix chinensis under salt stress was higher than that under non-salt stress, but the WUE of Nitraria tangutorum was higher than CK only in treatment Y 1 and Y2, and the WUE of Tamarix chinensis was always greater than that of Nitraria tangutorum;(4) Tamarix chinensis began to appear non-stomatal limitation caused by salt-stress from treatment Y3, and Nitraria tangutorum began from treatment Y1.In summary, the salt tolerance of Tamarix chinensis is stronger than that of Nitraria tangutorum and it is more suitable for planting in the study area.
Tamarix chinensisNitraria tangutorumsalt stressdiurnal variation of photosynthesis
NETL
NSTL
万方数据
维普
