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根域限制栽培下葡萄软化期土壤水势对果实糖积累的影响
作者: 李洪艳1  王世平2 *  
单位: (1广西农业科学院葡萄与葡萄酒研究所  南宁 530007;2上海交通大学农业与生物学院植物科学系  上海 200240)  
关键词: 根域限制   土壤水势  果实含糖量  果实品质  
分类号:S663.1
出版年,卷(期):页码:2012 ,43 ( 1 ): 页码:70-72
摘要:

【Objective】The relationship between sugar accumulation in grape berries and soil water potential was studied to provide a theoretical basis for water management at the maturity stage of grapes. 【Method】4-year-old ‘Fenghou’ grape (V. vinifera × V. labruscaa), cultivated under root restriction method, was selected to consecutively determine soil water potential and daily sugar unloading rate of grape berries during veraison stage using berry-cup method. 【Result】Sugar unloading rate in grape berries was found highest at soil water potential ranging from -2 to -4 kPa (6:00-10:00), and became relatively slower when soil water potential ranged from -5 to -14 kPa (11:00-18:00). The sugar unloading rate increased initially and then declined when soil water potential reached to -15 to -19 kPa (19:00-4:00), and was found lowest at about -20 kPa (5:00). Gaussian average curve fitting showed that sugar unloading rate in grape berries was highest at -16.86 kPa followed by a decrease with decrease in water potential. 【Conclusion】-16.86 kPa was found as critical value of soil water potential for irrigation of grapevine at veraison stage. 

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