摘要
采用SKPM-1400压力室、Li-6400光合仪测定了小×胡、胡杨、新疆杨幼苗的水分参数,光合蒸腾日进程,对比分析了小×胡幼苗的抗旱性。结果表明:小×胡ψw、ψ100π、ψ100p、ψ0π、V0、V a、RWD0、εmax分别为-1.80MPa、-1.63MPa、1.33MPa、-1.81MPa、85.14%、14.86%、10.28%、14.00MPa,与胡杨、新疆杨相比具有较低ψ100π、ψ0π和较高εmax,差异显著(P<0.05);小×胡Pn、Tr日进程均呈单峰曲线,日均值分别为8.29μmolCO2m-2s-1、4.09mmolH2Om-2s-1,WUE日均值为1.80mmolCO2mol-1H2O,与胡杨、新疆杨相比具有较低的Pn、Tr和较高的WUE,但差异不显著。初步说明小×胡保持最大膨压值的能力及抗失水能力较强,与新疆杨、胡杨相比具有较好的抗旱能力。
The water parameters, photosynthetic rates and transpiration rates of seedlings of Populus simonii ×P. euphratica species, P. euphratica and Populus alba were measured respectively by the SKPM - 1400 pressure chamber and Li -6400, for comparing and analysis of the drought resistances of these seedlings. The results showed that the ψw,ψ100π,ψ100p,ψ0π,V0,V a,RWD0 and εmax of Populus simonii × P. euphratica species were - 1.80MPa, - 1.63MPa, 1.33MPa, - 1.81MPa, 85.14%, 14.86%, 10.28% and 14.00MPa, respectively. It had lower ψ100π,ψ0π and higher εmax, showing the significant difference （ P 〈 0.05 ） with other seedlings. The Pn, Tr and WUE respectively were 8.29txmolCO2m^-2s^-1, 4.09 mmolH2Om^-2s^-1 , 1.80mmolCO2mol^-1 H2 O, compare with other seedlings it had no significant difference. So, the results indicate that the species Populus simonii × P. euphratica has good drought resistance compared with P. euphratica and Populus alba.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2014年第7期166-170,共5页
Journal of Arid Land Resources and Environment
基金
国家十二五科技支撑专题(2012BAD16B0104)资助
