Terroir 1996 banner
IVES 9 IVES Conference Series 9 Viticultural zoning using spatial analysis: characterizing terroirs over the Southern part of the Côtes-du-Rhône appellation (France)

Viticultural zoning using spatial analysis: characterizing terroirs over the Southern part of the Côtes-du-Rhône appellation (France)

Abstract

Les approches du terroir en tant qu’entité géographique (zonages) connaissent un développement accru récent en lien avec l’essor des SIG. Les méthodes, les objectifs et les critères utilisés varient considérablement selon les études. La délimitation de l’unité de terroir dite «fonctionnelle» se distingue de celles issues de diverses méthodes de cartographie informatisée, parmi lesquelles la méthode dite de «zonage des terroirs par l’analyse spatiale» objet de cette communication. Fondé sur l’analyse géomorphologique et pédologique du milieu physique en unités de pédopaysage, puis sur des regroupements de ces unités à l’aide de classifications statistiques, le zonage des terroirs par l’analyse spatiale repose sur l’interprétation de données de terrain et de photographies aériennes, ainsi que sur des traitements numériques d’images satellitales. Il a été mis en œuvre pour le vignoble AOC des Côtes-du-Rhône méridionales, couvrant 210 800 ha de territoires communaux, dont 60 000 plantés en vigne. Au moins 60 % des unités de terroir disposant de données de maturité 1982-1998 du Grenache et de la Syrah sont respectivement validées au moyen de l’analyse fréquentielle de ces données.

Spatial approaches on terroir as a geographical entity (“zoning”) are being developed, together with the steady rising of GIS data handling. Studies greatly differ in methods, objectives and the selected criteria. The delineation of so-called “functional” units has to be distinguished from varied digital mapping methods, such as the so-called “zoning of terroirs based on spatial analysis”, which is presented in this paper. Relying on the soil and landform analysis of the geographic space into soil-landscape units, which are clustered using statistical classifications, such zoning uses ground observations, aerial photograph examination, and also digital processing of satellite images. It was carried out in the Southern Côtes-du-Rhône Appelation vineyard, over 210 800 hectares, 60 000 of which planted with vines. At least 60 % of those of the modelled terroir units having harvest data are validated as for their viticultural response, across successive harvests of Grenache or Shiraz grapes in quality-clusters over the 1982-1998 vintages.

DOI:

Publication date: February 15, 2022

Issue: Terroir 2002

Type: Article

Authors

E.VAUDOUR (1), M.C. GIRARD (1), F. FABRE (2)

(1) Institut National Agronomique Paris-Grignon (INA-PG) -UFR AGER/DMOS -Centre de Grignon BP01 78850 Thiverval-Grignon-France
(2) Syndicat des Vignerons des Côtes-du-Rhône-Maison des Vins -6, rue des Trois Faucons -84000 Avignon -France

Contact the author

Keywords

zonage viticole, terroir, analyse spatiale géomorpho-pédologique
viticultural zoning, terroir, soil and landform spatial analysis

Tags

IVES Conference Series | Terroir 2002

Citation

Related articles…

Metabolomic profiling of heat-stressed grape berries 

The projected rise in mean air temperatures together with the frequency, intensity, and length of heat waves in many wine-growing regions worldwide will deeply impact grape berry development and quality. Several studies have been conducted and a large set of molecular data was produced to better understand the impact of high temperatures on grape berry development and metabolism[1]. According to these data, it is highly likely that the metabolomic dynamics could be strongly modulated by heat stress (HS).

Exploring the effect of ripening rates on the composition of aroma and phenolic compounds in Cabernet-Sauvignon wines

The study of cultural practices to delay ripening and the characterization of their effect on wine composition is important in the mitigation of accelerated ripening caused by higher temperatures

Field evaluation of biofungicides to control powdery mildew and botrytis bunch rot of wine grapes in California

Grapevine powdery mildew caused by Erysiphe necator and Botrytis bunch rot caused by Botrytis cinerea are two of the most important fungal diseases in California grape production.

IMPACT OF THE WINES’ QUALITY ON THE WINE DISTILLATES’ ORGANOLEPTIC PROFILE

Brandy de Jerez (BJ) is a spirit drink made exclusively from spirits and wine distillates and is characterized by the use of casks for aging that previously contained Sherries. The quality and sensory complexity of BJ depend on the raw materials and some factors: grape variety, conditions during processing the wine and its distillation, as well as the aging in the cask. Therefore, the original compounds of the grapes from which it comes are of great interest (1 y 2) being in most cases the Airén variety. Their relationship with the quality of the musts and the wines obtained from them has been studied (3) and varies each year of harvest depending on the weather conditions (4).

A mechanistic investigation of H/D scrambling processes in flavonoids

Several classes of flavonoids, such as anthocyanins, flavonols, flavanols and flavones, undergo a slow H/D exchange on aromatic ring A, leading to full deuteration at positions C(6) and C(8). Within the flavanol class, H-C(6) and H-C(8) of catechin and epicatechin are slowly exchanged in D2O to the corresponding deuterated analogues; even quercetin, a relevant flavonol representative, shows the same behaviour in a D2O/DMSOd6 1:1 solution. Detailed kinetic measurements of these H/D scrambling processes are here reported by exploiting the time-dependent changes of their peak areas in the 1H-NMR spectra taken at different temperatures. A unifying reaction mechanism is also proposed based on our detailed kinetic observations, even taking into account pH and solvent effects. Molecular modelling and QM calculations were also carried out to shed more light on several molecular details of the proposed mechanism.