侧柏叶温及叶绿素荧光特性对土壤水分胁迫的响应  

Responses of leaftemperature and characteristics of chlorophyll fluorescence of Platycladus orientalis to soil water stress

作　　者：董果[1] 戴勐[1] 赵勇[1] 李建中 侯娜[1] 宋晓明[1] 樊巍 

机构地区：[1]河南农业大学,郑州450002 [2]河南省济源市国有大沟河林场,河南济源454650 [3]河南省林科院,郑州450003

出　　处：《中国水土保持科学》2014年第1期68-74,共7页Science of Soil and Water Conservation

基　　金：国家自然科学基金"太行山地区荆条灌木‘肥岛’对外源氮响应机制及保育作用研究"(31270750);国家"十二五"科技支撑计划"黄土及华北石质山地水土保持林体系构建技术研究与示范"(2011BAD38B00)

摘　　要：为了研究土壤水分与植物生长间的关系,以侧柏为材料进行盆栽试验,人工控制土壤水分,设置4个水分梯度(正常供水、轻度水分胁迫、中度水分胁迫、重度水分胁迫),测定其叶温和叶绿素荧光参数。结果表明:随着干旱胁迫的加剧,叶温和非光化学淬灭升高;初始荧光F0总体上表现为逐渐上升的趋势;而最大荧光Fm、可变荧光Fv、PSⅡ最大原初光化学量子效率Fv/Fm、PSⅡ的潜在活性Fv/F0、PSⅡ实际光化学量子效率和表观光合电子传递速率均表现为下降。参数的日变化呈现单峰型曲线:PSⅡ实际光化学量子效率和非光化学淬灭的日变化曲线为凹形,而表观光合电子传递速率日变化曲线为凸形。可知干旱胁迫导致PSⅡ的电子传递效率降低,降低了光能利用率,影响其光合作用。In the hilly areas of Tai-hang Mountains,drought stress is a crucial factor limiting the survival and growth of plants.Detailed knowledge about the responses of Platycladus orientalis with different water treatments （i.e.well-watered,mild drought stress,moderate drought stress,and severe drought stress） to water stress would benefit us for the success of re-vegetation programs.The cholorophyll fluorescence parameters and leaf temperature of potted P.orientalis were measured experimentally.Prolonged severe drought stress increased the temperature,the non-photochemical quenching coefficient and decreased the max fluorescence （Fm）,the variable fluorescence （Fv）,the maximum quantum efficiency of PS Ⅱ photochemistry （Fv/Fm）,potential photochemical efficiency （Fv/F0）,the actual photochemical efficiency and the electron transport rate.The basis fluorescence （F0） exhibited a rising trend.The daily variation of the actual photochemical efficiency,the electron transport rate and the non-photochemical quenching coefficient were regular at different degrees of water stress.The curves of daily variation of the actual photochemical efficiency were concave in P.orientalis with heavier degree,while the curves of daily variation of the electron transport rate and the non-photochemical quenching coefficient were approximately unimodal at different degrees of water stress.

关 键 词：侧柏 叶温 叶绿素荧光 水分胁迫 

分 类 号：Q945.78[生物学—植物学]