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IVES 9 IVES Conference Series 9 OIV 9 OIV 2024 9 Short communications - Viticulture, table grapes, dried grapes and unfermented grape products 9 Evaluation of sap flow and trunk diameter measurements in grapevines using time series decomposition

Evaluation of sap flow and trunk diameter measurements in grapevines using time series decomposition

Abstract

Grapevines are very sensitive to weather conditions. Excessively hot and dry periods trigger the activation of survival mechanisms, such as reduction of crop transpiration and the redistribution of water. Monitoring these mechanisms is, therefore, essential to better understand the grapevine water dynamics and maximize water-use efficiency. In this sense, sensors were installed on the trunk of touriga-nacional grapevines, with the aim of determining sap flow and trunk diameter fluctuations in a vineyard located in the douro demarcated region, ne portugal. Seasonal and trend decomposition of the data was performed, as well as the assessment of the potential influence of weather variables, using locally estimated weighted regression and scatterplot smoothing. Decomposition allowed to determine the delay between the daily trunk diameter and the sap flow variations that decreased over time. Increasing hotter and drier conditions during the growing season were likely causes of this effect. Furthermore, inter-day variations in trunk diameter were highly correlated with relative humidity, highlighting the impact of air humidity on the plant’s responses. These results suggest the implementation of this methodology as part of the processing of time series related to the grapevine water status, particularly during adverse environmental conditions. 

Acknowledgments: this work is supported by national funds by fct – portuguese foundation for science and technology, under the project uidb/04033/2020. (https://doi.org/10.54499/uidb/04033/2020)

Evaluación de las mediciones del flujo de savia y del diámetro del tronco de la vid mediante descomposición de series temporales

La vid es muy sensible a las condiciones meteorológicas. Los períodos excesivamente calurosos y secos desencadenan la activación de mecanismos de supervivencia, como la reducción de la transpiración de lo cultivo y la redistribución del agua. Por lo tanto, monitorear estos mecanismos es esencial para comprender mejor la dinámica del agua de la vid y maximizar la eficiencia en el uso del agua. En este sentido, se instalaron sensores en el tronco de vides de touriga-nacional, con el objetivo de determinar el flujo de savia y las fluctuaciones del diámetro del tronco en un viñedo ubicado en la región demarcada del duero, ne de portugal. Se realizó la descomposición estacional y de tendencias de los datos, así como la evaluación de la influencia potencial de las variables meteorológicas, utilizando regresión ponderada estimada localmente y suavizado de diagramas de dispersión. La descomposición permitió determinar el retraso entre el diámetro diario del tronco y las variaciones del flujo de savia que disminuyeron con el tiempo. Las condiciones cada vez más cálidas y secas durante la temporada de crecimiento fueron probablemente las causas de este efecto. Además, las variaciones interdías en el diámetro del tronco estaban altamente correlacionadas con la humedad relativa, destacando el impacto de la humedad del aire en las respuestas de la planta. Estos resultados sugieren la implementación de esta metodología como parte del procesamiento de series de tiempo relacionadas con el estado hídrico de la vid, particularmente durante condiciones ambientales adversas.

Évaluation des mesures du flux de sève et du diamètre du tronc dans la vigne par décomposition de séries temporelles 

La vigne est très sensible aux conditions météorologiques. Les périodes excessivement chaudes et sèches déclenchent l’activation de mécanismes de survie, tels que la réduction de la transpiration de la culture et la redistribution de l’eau. La surveillance de ces mécanismes est donc essentielle pour mieux comprendre la dynamique de l’eau de la vigne et maximiser l’efficacité de l’utilisation de l’eau. En ce sens, des capteurs ont été installés sur le tronc des vignes touriga-nacional, dans le but de déterminer les fluctuations du flux de sève et du diamètre du tronc dans un vignoble situé dans la région démarqué du douro, au nord-est du portugal. Une décomposition saisonnière et tendancielle des données a été réalisée, ainsi qu’une évaluation de l’influence potentielle des variables météorologiques, à l’aide d’une régression pondérée et d’un lissage de nuages de points estimés localement. La décomposition a permis de déterminer le délai entre le diamètre journalier du tronc et les variations du flux de sève qui diminuaient avec le temps. Les conditions de plus en plus chaudes et sèches au cours de la saison de croissance sont probablement à l’origine de cet effet. De plus, les variations inter journalières du diamètre du tronc étaient fortement corrélées à l’humidité relative, mettant en évidence l’impact de l’humidité de l’air sur les réponses de la plante. Ces résultats suggèrent la mise en œuvre de cette méthodologie dans le cadre du traitement de séries temporelles liées à l’état hydrique de la vigne, notamment lors de conditions environnementales défavorables.

Publication date: November 18, 2024

Issue: OIV 2024

Type: Article

Authors

Aureliano Malheiro¹, Filipe Adão¹, Helder Fraga¹, João Santos¹

¹ UTAD (Universidade de Trás-os-Montes e Alto Douro) – CITAB (Centro de Investigação e Tecnologias Agroambientais e Biológicas) – Vila Real, Portugal

Contact the author*

Tags

IVES Conference Series | OIV | OIV 2024

Citation

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