摘要： 为筛选干旱地区生态建设的优良品种，以盆栽山杏为试材，控水模拟不同土壤水分状况，探讨了不同程度干旱胁迫对山杏叶片光合特性的影响。结果表明，山杏叶片净光合速率、蒸腾速率、气孔导度随着干旱胁迫程度的加强而降低。随着温度的升高，叶片净光合速率和水分利用效率降低、蒸腾速率升高，加重了干旱对其光合作用的影响。对照、轻度和中度干旱胁迫下的净光合速率、气孔导度及水分利用效率日变化曲线呈双峰型，重度胁迫下净光合速率和气孔导度日变化为单峰型。说明在一定的干旱条件下，山杏光合作用对干旱胁迫具有一定的适应能力。

关键词: 干旱胁迫, 光合特性, 山杏

Abstract: In this research,The response of photosynthetic character of prunus armeniaca to soil drought stress were studied.The results show that net photosynthet ic rate(Pn),transpirat ion rate(Tr)and stomatal conductance(Cs)decreased with the increases in drought stress.Compared with control(CK),decreases of intercellular CO₂concentration(Ci)under mild and moderate stress and increase under severe stress were fonnd.The test of respone of photosynthesis to temperature exhibited the decline of Pn and increase of Tr under higher temperature,and water use efficiency(WUE)decreased.The stress effects of drought were aggravated under higher temperature on photosynthesis.The diurnal variation curves of Pn,Cs and WUE were double-peak types under different water stress,but the curves of Pn and Cs were changed to single-peak types under severe stress.The conclusion is that the photosynthesis of Prunus armeniaca exhibits a certain adaptability to drought stress.

Key words: Drought stress, Photosynthetic character, Prunus armeniaca

中图分类号: 

• S662.2