摘要
以净光合速率(Pn)、气孔导度(Gs)、胞间CO2浓度(Ci)、叶片水势(ψw)以及水分利用效率(WUE)等生理参数作为评价指标,研究了长柄扁桃幼苗在壤土和沙土中对干旱胁迫的生理响应。结果表明:干旱胁迫强度和土壤质地均影响长柄扁桃光合参数的变化。在壤土中轻度干旱有利于长柄扁桃的生长,长柄扁桃在壤土中对干旱的适应性更强,在中度和重度干旱胁迫下长柄扁桃光合作用的下降主要是受非气孔因素控制。适度干旱胁迫能够提高长柄扁桃的水分利用率,在干旱程度逐渐增加的情况下,壤土比沙土的水分利用率峰值显示迟滞现象,说明在中度干旱下壤土比沙土抗旱性能更强。
The physiological response of Amygdalus pedunculata to drought stress in loamy soil and sandy soil were studied using the evaluation indexes including net photosynthetic rate(Pn),stomatal conductance(GS),intercellular CO2 concentration(CI),leaf water potential(ψw)and physiological parameters such as water use efficiency(WUE).The result showed that drought stress intensity and soil texture affected the changes of photosynthetic parameters of Amygdalus pedunculata.In loamy soil,mild drought is conducive to the growth of Amygdalus pedunculata,and Amygdalus pedunculata is more adaptable to drought in loamy soil.Under moderate and severe drought stress,the decline of photosynthesis of Amygdalus pedunculata is mainly controlled by non stomatal factors.Moderate drought stress can improve the water use efficiency of almond.The peak value of water use efficiency with loam than sandy soil shows hysteresis when the degree of drought increases gradually,indicating that almond growing in loam soil has stronger drought resistance than in sandy soil under moderate drought.
作者
杨涛
罗竹梅
施智宝
王海鹰
付广军
张鹏
YANG Tao;LOU Zhu-mei;SHI Zhi-bao;WANG Hei-ying;FU Guang-jun;ZHANG Peng(Shaanxi Academy of Forestry, Xi'an, Shaanxi 710082;Technology Research Center of Amygdalus pedunculata of State Forestry and Grassland Administration, Yulin, Shaanxi 719000;National Innovation Alliance of Amygdalus pedunculata, Yulin, Shaanxi 719000;Pinus sylvestris seed orchard of Shaanxi, Yulin, Shaanxi 719000)
出处
《陕西林业科技》
2021年第5期1-4,共4页
Shaanxi Forest Science and Technology
基金
陕西省重点研发项目(2019TSLNY03-03)
国家重点研发计划专项(2016YFC050080503)。
关键词
长柄扁桃
土壤质地
干旱胁迫
生理响应
Amygdalus pedunculata
soil texture
drought stress
physiological response
