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设施桃萌芽调控中冷量与热量的关系

DOI: 10.3724/SP.J.1145.2012.00728, PP. 728-733

Keywords: ,设施栽培,萌芽调控,低温需求,热量需求,数量关系

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Abstract:

为明确桃树萌芽过程中需冷量、低温积累量与需热量的数量关系,以10个设施栽培的低需冷量桃品种为试材,对其需冷量、需热量和不同低温积累时的需热量进行了测定.结果表明:在所用品种范围内,花芽与叶芽之间,在需冷量和需热量的高低上没有明显的规律性关系,花芽需冷(热)量高的品种,其叶芽需冷(热)量不一定高;反之亦然.对单一品种,需冷量与需热量的分布呈现出规律性,对于花芽,需冷量较低的品种其需热量较高,而需冷量较高的品种其需热量相对较低;对于叶芽,需冷量较低的品种其需热量较低,需冷量较高的品种其需热量也相对较高.有效低温积累影响需热量,有效低温积累达不到需冷量时,萌芽率低,需热量趋向于无穷大;达到需冷量后需热量随着有效低温积累的增加而减少.对于叶芽,随着有效低温积累的增加,萌芽率的变化趋向于跃变式,而花芽趋则向于渐变式.实验还发现,存在最佳的有效低温积累量,使芽从休眠到萌芽所需的总时间最短,这个有效低温积累量高于相应品种的需冷量.图6参37

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