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草业科学  2014 

生草覆盖对苹果展叶过程中光合特性的影响

DOI: 10.11829\j.issn.1001-0629.2013-0232, PP. 462-467

Keywords: 生草覆盖,展叶,光合作用,光系统功能

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Abstract:

?为揭示生草覆盖与清耕苹果园展叶过程中光合特性的差异,本研究采用气体交换和叶绿素荧光动力学技术分析5年龄苹果园生草覆盖和清耕条件下苹果展叶过程中光合和荧光参数的变化规律。结果表明,展叶初期,生草覆盖和清耕处理叶片叶绿素含量、净光合速率(Pn)、性能指数(PICS)和820nm光吸收的振幅(ΔI)显著低于完全展开叶片(EL),Pn分别为EL的26.9%和18.4%,PICS分别为EL的67.7%和53.4%,ΔI分别为EL的35.6%和30.5%;生草覆盖处理叶片叶绿素含量、Pn、PICS和ΔI显著高于清耕处理。生草覆盖和清耕处理叶片PSⅡ功能在展叶初期已有很大程度的发育,PSⅠ功能的发育程度相对较低;生草覆盖促进了展叶初期叶片PSⅡ和PSⅠ功能的发育,因此具有较高的光合效率。

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