RT Journal Article
SR Electronic
T1 Mapping Grapevine (Vitis vinifera L.) Water Status during the Season Using Carbon Isotope Ratio (δ13C) as Ancillary Data
JF American Journal of Enology and Viticulture
JO Am. J. Enol. Vitic.
FD American Society for Enology and Viticulture
SP 307
OP 315
DO 10.5344/ajev.2013.12125
VO 64
IS 3
A1 Ana Herrero-Langreo
A1 Bruno Tisseyre
A1 Jean-Pascal Goutouly
A1 Thibaut Scholasch
A1 Cornelis van Leeuwen
YR 2013
UL http://www.ajevonline.org/content/64/3/307.abstract
AB Vine water status is a major parameter for vine management because it affects both wine quality and yield. In order to optimize vineyard management and harvesting practices, it is necessary to characterize vineyard water status spatial variability. This work aims at establishing an empirical spatial model for stem water potential (ΨStem) with ancillary data based on vine water status. Carbon isotope ratio (δ13C) measured at harvest was selected as ancillary data because it reflects only the effect of vine water status variations integrated over the season and is not impacted by other factors such as vine nitrogen status. The proposed model was applied at the intrablock level. It is based on the spatial extrapolation of a ΨStem value measured at a reference site using δ13C values collected over the block. Measurements of ΨStem and δ13C were carried out over three consecutive years on 96 locations within the block. ΨStem values obtained with a spatial model were more accurate than ΨStem values obtained with a nonspatial model, indicating the relevancy of δ13C values to account for spatial variability of vine water status. Results show that operational maps of vine water status can be obtained by means of a spatial model, in which δ13C values from a previous season are used as ancillary data. Maps can be updated at any given time during the season by carrying out a limited number of ΨStem measurements in selected locations. This model offers a tool to monitor vine water status and to implement management practices while considering vine water status intrablock variability.