不同生育期调亏灌溉对酿酒葡萄耗水及果实品质的影响

Effect of regulated deficit irrigation at different growth stages on water consumption and fruit quality of wine grape

  • 摘要: 不同程度的土壤干旱对酿酒葡萄的果实品质、产量和水分利用效率具有显著影响。明晰不同生育阶段干旱胁迫效应对酿酒葡萄土壤水分精准化管理和节水灌溉方案的制定具有重要的意义。本文于2014年在河西走廊中东部武威市凉州区清源镇威龙葡萄园产区开展了酿酒葡萄不同生育期、不同干旱胁迫程度的试验研究。在保持其他生育期土壤水分为正常灌溉(土壤水分阈值70%~75%)的情况下, 在葡萄的萌芽期、抽蔓期、开花期、浆果膨大期和着色成熟期分别进行中度(土壤水分阈值60%~65%)和重度(土壤水分阈值50%~55%)的干旱处理, 同时增设浆果膨大期的充分灌溉(土壤水分阈值80%~85%)处理, 以全生育期的正常灌溉(土壤水分阈值70%~75%)作为对照, 进行葡萄耗水特征和产量品质的测定。试验结果表明: 不同处理土壤含水量垂直变化趋势一致, 随土壤深度增加土壤含水量呈持续递增趋势; 随着土壤深度递增, 调亏灌溉对土壤含水量的影响越来越弱; 40~60 cm土壤剖面, 调亏处理含水量较对照减少幅度最大; 浆果膨大期土壤剖面内含水量均低于其他生育期。不同处理酿酒葡萄耗水强度随时间变化趋势一致, 萌芽期日耗水强度最小, 为0.13~0.33 mm·d-1, 而浆果膨大期耗水强度最大, 为2.30~4.09 mm·d-1。萌芽期中度胁迫处理酿酒葡萄产量和水分利用效率最高, 分别达到15 228 kg·hm-2和3.62 kg·m-3; 浆果膨大期充分灌溉处理次之, 而浆果膨大期重度胁迫处理最低, 仅分别为7 128 kg·hm-2和2.26 kg·m-3。着色成熟期中度胁迫下, 酿酒葡萄花青苷、还原糖、单宁、总酚含量比生育期正常供水处理高2.7%、6.56%、17.91%和23.23%, 且有效抑制可滴定酸积累(P<0.05), 而其他处理与对照之间品质指标差异不显著。综合考虑产量、水分生产效率及果实品质等指标, 最佳酿酒葡萄水分调控处理为着色成熟期中度胁迫, 即着色成熟期土壤相对含水率为60%~65%、其余生育期土壤相对含水率为70%~75%。由此可见, 在酿酒葡萄栽培时适时、适度的调亏灌溉既能显著提高水分生产效率, 实现节水、高效用水的目的, 又能提高果实品质, 对河西走廊地区酿酒葡萄种植具有重要的意义。

     

    Abstract: Soil drought notably influences fruit quality, yield and water use efficiency of wine grape. It is therefore important to clarify the effect of drought stress at different growth stages on soil water precision management and water-saving irrigation schedules in wine grape fields. To explore this effect, an experiment was carried out in 2014 at Weilong vineyard in Qingyuan Town in Liangzhou District, which belongs to Wuwei City in Hexi Corridor. The study evaluated the effects of drought stress caused by regulated deficit irrigation at different growth stages on water consumption and fruit quality of vine grape. In the experiment, 12 treatments were set up, 10 of which were moderate soil water stress (relative soil water content maintained at 60%–65% field capacity) and severe soil water stress (relative soil water content maintained at 50%–55% field capacity), respectively, at germination, vine growth period, florescence period, berry enlargement and coloring maturity periods with other growth stage under normal water condition (relative soil water content maintained at 70%–75% field capacity). Meanwhile, a full irrigation (relative soil water content maintained at 80%–85% field capacity) during berry enlargement period was also carried out and the normal water supply (relative soil water content maintained at 70%–75% field capacity) during the whole growth period was as the control. The results showed that the variation trend in soil water content within the 0100 cm soil layer were similar in different treatments, i.e., the soil water increased with increasing soil depth. The effects of drought stress controlled with regulated deficit irrigation was weakened with increased soil depth, and the soil layer of 4060 cm was with largest soil water reduction compared with CK. Soil water content along profile was lowest at berry enlargement period for all the treatments. The timely change trend of water consumption rate of wine rape was similar for different treatments. The minimum and maximum daily water consumption rates of wine grape occurred respectively during germination period (0.130.33 mm·d-1) and berry enlargement period (2.30–4.09 mm·d-1). Maximum yield and water use efficiency appeared under moderate water stress at grape germination period, which were 15 228 kg·hm-2 and 3.62 kg·m-3, respectively. This was followed by grape enlargement period full irrigation treatment (7 128 kg·hm-2 and 2.26 kg·m-3), while minimum rate was under severe soil water stress at grape enlargement period. Anthocyanins, total reducing sugar, tannin and total phenol contents in wine grape under severe soil water stress at coloring maturity stage were respectively 2.7% and 6.56%, 17.91% and 23.23% higher than that of under the full irrigation treatment, and titratable acid content effectively was restrained (P < 0.05). There was no significant difference (P > 0.05) in wine grape quality between the control and other treatments. In terms of integrated yield, water productivity efficiency and fruit quality, the optimum irrigation pattern of wine grape was moderate soil water stress at coloring maturity (relative soil water content maintained at 60%–65% field capacity) in combination with normal water supply (relative soil water content maintained at 70%–75% field capacity) during the other growth periods. Therefore, reasonable regulated deficit irrigation significantly improved water productivity efficiency of wine grape. This was not only water-saving, but high in water use efficiency and beneficial for grape quality improvement which was important for vine grape cultivation in Hexi Corridor.

     

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