土壤干旱胁迫对紫叶小檗和小叶黄杨光合生理特性的影响

目的]研究紫叶小檗和小叶黄杨在不同土壤水分胁迫下的光合生理特性。方法]在盆栽试验中,将土壤相对含水量设90%~95%、60%~65%、40%~45%和20%~25%4个梯度,分别为对照、轻度、中度和重度干旱胁迫处理,干旱胁迫后第10天测定2种植物的叶绿素荧光和光合作用参数。结果]随着水分胁迫的加重,2种植物主要光合参数Pn、Tr、Gs逐渐降低;WUE先升后降,紫叶小檗在轻度水分胁迫时WUE最高,小叶黄杨在中度水分胁迫时WUE最高;两植物叶绿素荧光参数Fo升高,Fm、Fv、Fv/Fm、Fv/Fo降低,其中紫叶小檗的变幅均大于小叶黄杨。结论]水分胁迫对紫叶小檗和小叶黄杨的光合生理特性产生较大影响,但二者变化幅度有差异,紫叶小檗对土壤水分胁迫更为敏感,小叶黄杨的抗干旱能力明显大于紫叶小檗。

Effects of Soil Drought Stress on Photosynthetic Physiological Characteristics of Berberis thunbergii cv. atropurpurea and Buxus sinica

Objective] The propose was to study the photosynthetic physiological characteristics in Berberis thunbergii cv.atropurpurea and Buxus sinica under different soil water stress.Method] In the pot test,the relative water contents in the soil were set up as 4 grades of 90%-95%,60%-65%,40%-45% and 20%-25%,which were the CK and light,middle and heavy drought stress treatment.The chlorophyll fluorescence and photosynthetic parameter of 2 plants were determined on 10th after drought stress treatment.Result] With...