Thermoregulation capability of the leaf canopy according to canopy area and grapevine cultivar

S. Vélez, E. Barajas, R. Vacas, J.A. Rubio
Temperature is a critical parameter in the proper grapevine development due to its implication in several important aspects such as grapevine physiology, transpiration, or stomatal conductance. Therefore, it is essential to know how temperature affects different cultivars. Moreover, plant radiation balance mainly depends on leaf area, structure, and radiation that crosses it, so it is crucial to consider the canopy area and structure to understand thermal canopy balance. These parameters can be estimated using remote sensing. In this work, 46 grapevine cultivars were analysed using a UAS (unattended automatic system) composed of a UAV and a thermal and multispectral sensor to understand how the canopy of the different cultivars is affected by temperature and the relationship between the canopy area and the canopy temperature. The results showed that: i) the higher the canopy area, the lower the canopy temperature of the plant. A moderate negative linear relationship (R2>0.6) was found between thermal values and canopy area obtained from NDVI; ii) there were statistically significant differences (p<0.05) between the cultivars in canopy area and temperature; iii) a higher vegetative development is associated with a higher thermoregulation capacity; and iv) there can be differences in the plant canopy of the same plant larger than 10°C between the side that receives solar radiation and the shaded side.
Vélez, S., Barajas, E., Vacas, R. and Rubio, J.A. (2024). Thermoregulation capability of the leaf canopy according to canopy area and grapevine cultivar. Acta Hortic. 1390, 81-88
DOI: 10.17660/ActaHortic.2024.1390.11
NDVI, thermal imaging, precision viticulture, canopy temperature, remote sensing, UAV

Acta Horticulturae