四翅滨藜和多枝柽柳对土壤干旱的响应差异1
Differences in response to soil drought in Atriplex canescens and Tamarix ramosissima
在干旱区防护林建设中,选择抗逆性和适应力强的植物树种是关键。通过模拟不同干旱梯度的盆栽控水实验以比较塔里木盆地引种植物四翅滨藜和乡土植物多枝柽柳对干旱胁迫生态适应性差异。结果表明:(1)随着干旱程度增加,四翅滨藜和多枝柽柳叶片含水量均逐渐降低,保水力、脯氨酸含量、相对电导率逐渐增大。四翅滨藜和多枝柽柳的可溶性糖含量、丙二醛含量分别在在轻度、重度干旱下有最大值,多枝柽柳的增幅更大。(2)四翅滨藜和多枝柽柳POD活性逐渐增大,重度干旱下,多枝柽柳较对照增加的百分比约为四翅滨藜的3 倍;在中度干旱下SOD活性最大,多枝柽柳较对照增加的百分比约为四翅滨藜的 5倍。(3)四翅滨藜和多枝柽柳叶绿素含量均为轻度干旱>对照>中度干旱>重度干旱,多枝柽柳的净光合速率、蒸腾速率、气孔导度和胞间二氧化碳浓度均逐渐降低,轻度干旱对四翅滨藜叶绿素和光合能力有略微促进作用。(4)相关性和主成分分析结果显示干旱胁迫下多枝柽柳各性状间的联系更紧密,四翅滨藜不易改变性状和性状之间的联系,相对保守。结论:四翅滨藜受到干旱胁迫的影响较小,其干旱适应性强于多枝柽柳。
In the construction of shelter forests in arid areas,the selection of plant species with strong stress tolerance and adaptability is the key.By simulating the pot water control experiment with different drought gradients,the ecological adaptability of the introduced plant Atriplex canescens and the native plant Tamarix ramosissima willow to drought stress was compared.The results showed that:(1)With the increase of drought degree,the water content of the leaves of A.canescens and T.ramosissima decreased gradually,and the Water retention capacity,Proline content and Relative conductivity gradually increased.The Soluble sugar content and Malondialdehyde content of A.canescens and T.ramosissima were the maximum in mild and severe drought,respectively,and the increase rate was greater in T.ramosissima.(2)The POD activity of A.canescens and T.ramosissima increased gradually,and under severe drought,the percentage increase of T.ramosissima compared to the control was about 3 times that of A.canescens;SOD activity was greatest under moderate drought,and the percentage increase in T.ramosissima compared to the control was about 5 times that of A.canescens.(3)The Chlorophyll content of A.canescens and T.ramosissima were mildly dry>control>moderate drought>severe drought,the net Photosynthetic rate,Transpiration rate,Stomatal conductance and Intercellular carbon dioxide concentration of T.ramosissima decreased gradually,and mild drought had a slight promoting effect on Chlorophyll and photosynthetic capacity of A.canescens.(4)The correlation and principal component analysis results showed that the relationship between the traits of T.ramosissima was closer under drought stress,and the relationship between traits and traits was not easy to change in A.canescens,which was relatively conservative.Conclusion:A.canescens is less affected by drought stress,and its drought adaptability is stronger than that of T.ramosissima.
胡焕琼;李利;于军;梁海连;吕瑞恒;
塔里木大学生命科学与技术学院,新疆阿拉尔 843300##新疆生产建设兵团塔里木盆地生物资源保护利用重点实验室,新疆阿拉尔 843300;中国科学院新疆生态与地理研究所,新疆乌鲁木齐 830011;新疆生产建设兵团塔里木盆地生物资源保护利用重点实验室,新疆阿拉尔 843300##塔里木大学园艺与林学学院,新疆阿拉尔 843300;塔里木大学生命科学与技术学院,新疆阿拉尔 843300##新疆生产建设兵团塔里木盆地生物资源保护利用重点实验室,新疆阿拉尔 843300;新疆生产建设兵团塔里木盆地生物资源保护利用重点实验室,新疆阿拉尔 843300##塔里木大学园艺与林学学院,新疆阿拉尔 843300;
Atriplex canescens Tamarix ramosissima Physiological characteristics Drought adaptability
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