Field heterogeneity of soil texture controls leaf water potential spatial distribution predicted from UAS-based vegetation indices in non-irrigated vineyards
<p>Grapevine water status exhibits substantial variability even within a single vineyard. Understanding how edaphic, topographic, and climatic conditions impact grapevine water status heterogeneity at the field scale, in non-irrigated vineyards, is essential for winemakers as it significantly...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2025-01-01
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| Series: | Biogeosciences |
| Online Access: | https://bg.copernicus.org/articles/22/513/2025/bg-22-513-2025.pdf |
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| Summary: | <p>Grapevine water status exhibits substantial variability even within a single vineyard. Understanding how edaphic, topographic, and climatic conditions impact grapevine water status heterogeneity at the field scale, in non-irrigated vineyards, is essential for winemakers as it significantly influences wine quality. This study aimed to quantify the spatial distribution of grapevine leaf water potential (<span class="inline-formula">Ψ<sub>leaf</sub></span>) within vineyards and to assess the influence of soil property heterogeneity, topography, and climatic conditions on intra-field variability in two non-irrigated vineyards during two viticultural seasons. By combining multilinear vegetation indices from very-high-spatial-resolution multispectral, thermal, and lidar imageries collected with uncrewed aerial systems (UASs), we efficiently and robustly captured the spatial distribution of <span class="inline-formula">Ψ<sub>leaf</sub></span> across both vineyards on different dates. Our results demonstrated that in non-irrigated vineyards, the spatial distribution of <span class="inline-formula">Ψ<sub>leaf</sub></span> was mainly governed by the within-vineyard soil hydraulic conductivity heterogeneity (<span class="inline-formula"><i>R</i><sup>2</sup></span> up to 0.81) and was particularly marked when the evaporative demand and the soil water deficit increased, since the range of <span class="inline-formula">Ψ<sub>leaf</sub></span> was greater, up to 0.73 MPa, in these conditions. However, topographic attributes (elevation and slope) were less related to grapevine <span class="inline-formula">Ψ<sub>leaf</sub></span> variability. These findings show that the soil property within-field spatial distribution and climatic conditions are the primary factors governing <span class="inline-formula">Ψ<sub>leaf</sub></span> heterogeneity observed in non-irrigated vineyards, and their effects are concomitant.</p> |
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| ISSN: | 1726-4170 1726-4189 |