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施氮和供水对混播和单播白羊草叶片 叶绿素荧光特性的影响
苏国霞1; 丁文利1; 刘金彪1; 李敏1; 王智1,2; 徐炳成1,2
Source Publication植物资源与环境学报

为明确干旱条件下混播和施氮对白羊草〔Bothriochloa ischaemum ( Linn.) Keng〕叶片叶绿素荧光参数的影响,
采用盆栽法并设置不同混播比例〔白羊草与柳枝稷( Panicum virgatum Linn.) 混播比例分别为8 ∶0、6 ∶2、4 ∶4和2 ∶6〕、
施氮水平( 即不施氮和1 kg 干土施0. 1 g 纯氮) 和供水条件( 即正常供水和干旱胁迫6 d 后复水) ,对白羊草叶片叶
绿素荧光参数的变化进行比较分析; 在此基础上,采用一般线性模型分析这3 个因素及其交互作用对白羊草叶绿
素荧光参数的影响效应。结果显示: 正常供水条件下,各处理组白羊草的最大光化学效率( Fv /Fm
) 、实际光化学效
) 、表观光合电子传递速率( ETR) 、光化学淬灭系数( qP) 和非光化学淬灭系数( NPQ) 均无明显变化。干旱
及复水条件下,不施氮处理组白羊草的Fv /Fm
值在干旱胁迫6 d( 即土壤相对含水量最低) 时降至最低值,并在复水
2 d后恢复至与正常供水条件下相近的水平,而施氮处理组的Fv /Fm
不论施氮与否,各处理组白羊草的ΦPSⅡ、ETR、qP 和NPQ 值基本上均表现为在干旱胁迫6 d 时达到最高值,并在复
水2 d 后恢复至正常供水条件下各参数值的90%以上。总体上看,混播白羊草的qP 和ETR 值均高于单播白羊草,
而其NPQ 值则低于后者。统计分析结果表明: 混播比例、施氮水平和供水条件3 个因素间的交互作用对白羊草的
ΦPSⅡ、qP 和ETR 值无显著影响,施氮水平对NPQ 值的单独作用、施氮水平和混播比例的交互作用对Fv /Fm
施氮水平和供水条件的交互作用对ETR 值也无显著影响,但这3 个因素的单独作用及两两因素间的交互作用对白
羊草其余叶绿素荧光参数均有显著或极显著影响。研究结果表明: 一定程度的干旱胁迫有利于提高白羊草叶片
PSⅡ反应中心的开放程度、光合电子传递速率和热耗散过剩光能的能力; 在干旱胁迫条件下,施氮有助于白羊草叶
片维持PSⅡ反应中心的活性和光化学效率; 并且,与柳枝稷适度混播可改善白羊草叶片的光合性能,提高其种间竞

Other Abstract

In order to figure out the effects of mixed sowing and nitrogen applying on leaf chlorophyll
fluorescence parameters of Bothriochloa ischaemum ( Linn.) Keng under drought condition,a pot-culture
method was employed to compare and analyze the changes in leaf chlorophyll fluorescence parameters ofB. ischaemum cultivated under different mixed sowing ratios ( B. ischaemum mixed sowing with Panicum
virgatum Linn. at the ratio of 8 ∶ 0,6 ∶ 2,4 ∶ 4 and 2 ∶ 6,respectively) ,nitrogen applying levels ( no
nitrogen applying and applying 0. 1 g pure nitrogen into 1 kg dry soil) and water supplying conditions
( normal water supplying and rewatering after drought stress for 6 d) . On this basis,general linear model
was used to analyze the influences of these three factors and their interaction on chlorophyll fluorescence
parameters of B. ischaemum. The results show that there is no obvious change in the maximal
photochemical efficiency ( Fv /Fm
) ,actual photochemical efficiency ( ΦPSⅡ
) ,apparent photosynthetic
electron transport rate ( ETR ) ,photochemical quenching coefficient ( qP ) and non-photochemical
quenching coefficient ( NPQ) of B. ischaemum in all treatment groups under normal water supplying
condition. Under drought and rewatering condition,Fv /Fm value of B. ischaemum in no nitrogen applying
treatment group drops to the lowest value at drought stress for 6 d ( when soil relative water content is the
lowest) ,and is back to close level under normal water supplying condition at rewatering for 2 d,while
Fv /Fm value in nitrogen applying treatment group is always near to the level under normal water supplying
condition. Regardless of nitrogen application,ΦPSⅡ
,ETR,qP and NPQ values in all treatment groups
basically reach the highest value at drought stress for 6 d,and restore to more than 90% of all values
under normal water supplying condition after rewatering for 2 d. In general,qP and ETR values of mixed
sowing B. ischaemum are higher than those of pure sowing B. ischaemum,while NPQ value is lower than
that of the latter. Statistical analysis result shows that interaction among three factors including mixed
sowing ratio,nitrogen application level and water supplying condition has no significant effect on ΦPSⅡ

qP and ETR values of B. ischaemum,and single action of nitrogen application level on NPQ value,
interaction between nitrogen applying level and mixed sowing ratio on Fv /Fm value,and interaction
between nitrogen applying level and water supplying condition on ETR value are also not significant.
However,single action and interaction between two factors of the three factors have significant or
extremely significant effects on other chlorophyll fluorescence parameters of B. ischaemum. In conclusion,
a certain degree of drought stress would be beneficial for enhancing open proportion,photosynthetic
electron transport rate and heat dissipation for excess luminous energy of PSⅡ action center in leaf of B.
ischaemum; under drought stress condition, nitrogen applying helps to maintain activity and
photochemical efficiency of PSⅡ action center in leaf of B. ischaemum; and appropriately mixed sowing
with P. virgatum can improve the photosynthetic performance of leaf of B. ischaemum and increase its
interspecific competitive adaptability.

Keyword白羊草 混播比例 柳枝稷 施氮 干旱胁迫 叶绿素荧光参数
Indexed By中文核心期刊要目总览
Document Type期刊论文
Recommended Citation
GB/T 7714
苏国霞,丁文利,刘金彪,等. 施氮和供水对混播和单播白羊草叶片 叶绿素荧光特性的影响[J]. 植物资源与环境学报,2017,26(1):10-20.
APA 苏国霞,丁文利,刘金彪,李敏,王智,&徐炳成.(2017).施氮和供水对混播和单播白羊草叶片 叶绿素荧光特性的影响.植物资源与环境学报,26(1),10-20.
MLA 苏国霞,et al."施氮和供水对混播和单播白羊草叶片 叶绿素荧光特性的影响".植物资源与环境学报 26.1(2017):10-20.
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