Effects of salt stress on growth and physiological characteristics of Tamarix chinensis and Nitraria tangutorum seedlings
[Objective] This study analyzed and compared salt tolerance of two plants in Qaidam to provide scientific basis for improving saline soil in Qinghai.[Method] Taking Tamarix chinensis and Nitraria tangutorum seedlings as test materials,a pot experiment was conducted to study their growth and physiological characteristics under different soil salt contents (mass fraction 0.25 ％ (control),0.40％,0.50％,0.60％,0.70％,and 0.80％).[Result] (1) Compared with the control,salt stress significantly inhibited the growth and photosynthesis of two seedlings.When the soil salt content was less than 0.40％,it had the roughly same effects on height,diameter increment and fresh weight of two seedlings.When salt content was higher than 0.60 ％,the impact on the growth of N.tangutorum was greater than on T.chinensis.Under the influence of salt stress,two seedlings almost had no difference in dry mass dropping rate.(2) When the soil salt content was less than 0.40 ％,it had the roughly same effects on contents of Na+ and K+ and Na+/K+ ratios of the two seedlings leaves.When salt content was higher than 0.60％,changes in Na+ and K+ contents of N.tangutorum were greater than that of T.chinensis.(3) When the soil salt content was less than 0.40％,it had the roughly same effects on net photosynthetic rate,transpiration rate,stomatic conductance and intercellular CO2 concentration among seedlings.When salt content was higher than 0.60％,changing rates of all photosynthesis indexes of N.tangutorum were greater than those of T.chinensis.[Conclusion] Compared to N.tangutorum,T.chinensis seedling showed higher salt tolerance and was more suitable in the Qaidam region with higher salt content (＞0.60％).
soil salt contentTamarix chinensisNitraria tangutorumsalt tolerance
NETL
NSTL
万方数据
维普
