水分胁迫对脂松幼苗叶绿素荧光特征的影响

Effects of Water Stress on Chlorophyll Fluorescence of Red Pine Seedlings

以2年生盆栽脂松苗木为材料,研究了不同土壤含水量(干旱和水渍胁迫及解除胁迫后)对脂松幼苗的叶绿素荧光参数的影响,旨在为脂松的扩大栽培和管理提供理论依据。结果表明:(1)土壤水分胁迫对脂松苗木针叶初始荧光(Fo)、最大荧光(Fm)、可变荧光(Fv)、PSⅡ最大光化学效率(Fv/Fm)、PSⅡ电子传递量子产率(ΦPSⅡ)有显著影响(p<0.05);(2)干旱和淹水胁迫中脂松针叶光化学效率(Fv/Fm)均表现为随胁迫强度增大和时间的延长而降低,总体表现为FC60>FC80>FC>FC40>FC20>FL,解除胁迫后有不同程度的升高,且干旱处理比水淹处理恢复快。(3)60%土壤含水量叶绿素荧光参数水平最佳,据此认为中等轻度干旱立地较适宜脂松苗木生长。

Two-year-old red pine seedlings were grown in pots to study the effects of different soil water contents （including aridity, waterlogging stress and stress relief） on the chlorophyll fluorescence parameters of red pine seedlings in order to provide theoretical foundation for the expansion of cultivation and management of red pines＇. The results were as follows ： （ 1 ） Dramatic responses in fluorescence origin （ Fo）, fluorescence maximum （ Fm ）, fluorescence variety （F,）, maximal photochemical efficiency （F,,/Fn,） and quantum yield of PS H electron transport （~PSn） were detected under different soil water stress （p 〈 0.05 ） ; （2）Under both aridity and water- logging stress, FJFm decreased with the increasing of the stress intensity and the extending of the stress time, presenting as FC60 〉 FCS0 〉 FC 〉 FC40 〉 FC20 〉 FL, and the Fv/Fm in all treatments had risen with various ex- tents （recovery speed of aridity treatment was faster than that of waterlogging treatment） ; （3） The chlorophyll fluorescence parameters under the condition of FC60 were optimal. Therefore, the moderately and mildly arid sites are more suitable for the growth of red pine seedlings.