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缺水条件下冬小麦的光能吸收和干物质积累运转的分析

DOI: 10.3321/j.issn:1000-7091.1989.z1.015, PP. 86-91

Keywords: 冬小麦,水分胁迫,光吸收量,生物量积累,籽粒灌浆,折线拟合

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Abstract:

应用品种Brock和Renard在温室和大田试验结果表明生物量与光能吸收量呈线性关系;温室受旱作物生育后期光能转化效率降低.水分亏缺主要通过降低光能吸收量,其次通过降低光能转化效率影响生物量积累.总生物量及茎鞘生物量积累都明显受到中、后期缺水的抑制,以开花前缺水的影响为甚.两品种生物量积累方式不同,Renard开花后积累转慢.缺水强化了茎鞘贮存物质的重新分配,尤以灌浆期缺水为甚.籽粒灌浆过程可用三段折线模式来拟合.开花前缺水使灌浆增强,部分地补偿了粒数的降低;后期干旱影响灌浆致使粒重降低.两品种属于不同灌浆类型,似乎短快型对避开后期干旱较有利.

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