不同CO_2浓度及干旱胁迫下高羊茅的生理响应和光谱特征  

Physiological Response and Spectral Characteristics of Tall Fescue under Different Drought Stress and CO_2 Concentrations

作　　者：杨璐璐[1,2] 华开[1,2] 张学霞[1,2] 

机构地区：[1]北京林业大学教育部水土保持与荒漠化防治重点实验室 [2]北京林业大学水土保持学院,北京100083

出　　处：《中国草地学报》2014年第4期72-78,91,共8页Chinese Journal of Grassland

基　　金：中央高校基本科研业务费专项资金(TD2011-2);国家“973”计划项目(2010CB951101)资助

摘　　要：为了探明CO2浓度升高对高羊茅生理及光谱特征的影响,探索高羊茅光谱特征与其生理特征之间的联系,利用对比和相关分析的方法,通过盆栽控制试验研究了高羊茅在不同水分(充足、轻度干旱胁迫、重度干旱胁迫)和CO2浓度(390μmol/mol和700μmol/mol)条件下的光谱及生理变化,并分析了光谱特征参数与高羊茅生理参数间的相关性。结果表明:CO2浓度升高可减弱干旱胁迫对高羊茅净光合速率、叶绿素含量及叶片含水量的影响,使高羊茅抗旱性增强;CO2浓度升高增大了高羊茅光谱反射曲线的波谱起伏,抑制了干旱胁迫导致的红边蓝移现象;高羊茅的光谱特征参数与其生理特征具有极强的相关性。To ascertain the impacts of elevated CO2 concentration on tall fescue physiological and spec- tral characteristics, and explore the linkages between physiological characteristics and spectral characteris- tics, comparison method and correlation analysis were used to study physiological and spectral changes un- der different moisture conditions （sufficient soil water supply, mild drought stress and severe drought stress） and different CO2 concentrations 390μmol/mol and 700μmol/mol） in a pot controlled trail, corre- lation analysis between spectral characteristic parameters and physiological parameters of tall rescue were also conducted. The results showed that （1）elevated CO2 concentration may weaken the effects of drought stress on net photosynthetic rate, chlorophyll content, and leaf water content of tall rescue, and enhance its drought resistance; （2）spectral fluctuation of the spectral reflectance curves were increased and the phe- nomenon of red edge blue shift caused by drought stress was inhibited when CO2 concentration was elevat- ed; （3）there were significant correlation between physiological characteristics and spectral characteristics of tall fescue.

关 键 词：高羊茅 CO2浓度 干旱胁迫 生理特征 高光谱 

分 类 号：S688.4[农业科学—观赏园艺]