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Terroir of Winter Hardiness: I. Bud LT50, Water Metrics, Yield, and Berry Composition in Ontario Riesling
American Journal of Enology and Viticulture ( IF 2.630 ) Pub Date : 2020-07-09 , DOI: 10.5344/ajev.2020.19084
Mary K. Jasinski , Andrew G. Reynolds , Fred Di Profio , Audrey Pasquier , Maxime Touffet , Rea Fellman , Hyun-Suk Lee

Grapevine winter hardiness is governed by several factors besides extreme weather conditions, such as site-specific soil factors (texture, composition, moisture, drainage), vine water status, and yield. It was hypothesized that winter hardiness would be influenced by specific vineyard terroir-driven factors and that zones in vineyards with low water status (leaf water potential [Ψ]) would likewise be more winter hardy than vines with high water status (less negative leaf Ψ). Six Riesling vineyards were chosen throughout the Niagara region in Ontario. Data were collected at fruit set, lag phase, and veraison (soil water content [SWC], leaf Ψ), at harvest (yield components, berry composition), and three times during the winter (LT50; the temperature at which 50% of buds die) in 2010 to 2012. Interpolation and mapping of variables was completed using kriging, and statistical analyses (linear correlation, k-means clustering, principal components analysis, multilinear regression) were performed. SWC, leaf Ψ, yield components, berry composition, and LT50 were spatially clustered in each vineyard. GIS and multilinear regression revealed that leaf Ψ could predict the LT50 value, with strong correlations observed between LT50 and leaf Ψ values in most of the vineyard blocks in 2010 to 2011 (4/6 and 5/6, respectively). In the extremely dry 2012 season, leaf Ψ (range across sites at veraison 0.9 to 1.4 MPa) was positively correlated to LT50, yield, titratable acidity, pH, and Brix and inversely correlated to SWC and monoterpene concentration. Results suggest that there is a spatial component to winter hardiness, as with other aspects of terroir. This study allows a method to compare winter hardiness to other critical variables to better understand terroir-based factors of the Niagara region.

中文翻译:

冬季抗寒风土:I. 安大略雷司令的芽 LT50、水分指标、产量和浆果成分

除了极端天气条件外,葡萄藤的抗寒性还受其他几个因素的控制,例如特定地点的土壤因素(质地、成分、水分、排水)、葡萄藤水分状况和产量。据推测,冬季抗寒性会受到特定葡萄园风土驱动因素的影响,并且葡萄园中水分状况(叶水势 [Ψ])低的区域同样比水分状况高的葡萄藤(负叶 Ψ 负值较小)更耐寒)。在安大略省的尼亚加拉地区选择了六个雷司令葡萄园。在坐果期、滞后期和转色期(土壤含水量 [SWC]、叶 Ψ)、收获期(产量成分、浆果组成)和冬季(LT50;50% 的温度)收集数据。芽死亡)在 2010 年到 2012 年。使用克里金法完成变量的内插和映射,并进行统计分析(线性相关、k 均值聚类、主成分分析、多元线性回归)。SWC、叶 Ψ、产量成分、浆果组成和 LT50 在每个葡萄园中在空间上聚集。GIS 和多元线性回归表明,叶片 Ψ 可以预测 LT50 值,在 2010 年至 2011 年(分别为 4/6 和 5/6)的大部分葡萄园区块中,LT50 和叶片 Ψ 值之间观察到很强的相关性。在 2012 年极度干燥的季节,叶片 Ψ(在 veraison 0.9 到 1.4 MPa 之间的范围内)与 LT50、产量、可滴定酸度、pH 值和白利糖度呈正相关,与 SWC 和单萜浓度呈负相关。结果表明冬季抗寒性存在空间成分,与风土的其他方面一样。这项研究提供了一种将冬季抗寒性与其他关键变量进行比较的方法,以更好地了解尼亚加拉地区基于风土的因素。
更新日期:2020-07-09
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