Soil moisture and vapour pressure deficit predict trunk water potential in field-grown kiwifruit

IF 4.6 2区农林科学 Q1 HORTICULTURE

Scientia Horticulturae Pub Date : 2026-10-01 Epub Date: 2026-10-12 DOI:10.1016/j.scienta.2026.115219

Giuseppe Montanaro, Maria Calabritto, Alba Nicoletta Mininni, Bartolomeo Dichio

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Abstract

A dynamic model has been developed to predict trunk water potential (Ψ_trunk) from soil water content (SWC) and air vapour pressure deficit (VPD) in field-grown kiwifruit. The model included a capacitor (trunk tissue) apart of soil in order to account for the time lag between transpiration and Ψ_trunk. Sub-models were defined from known, calibrated or specifically developed relationships linking SWC or VPD to hydraulic resistances of the whole soil-leaf path and of the storage compartment, plant leaf area and transpiration. Estimation of soil water potential from SWC was also included. The estimations of Ψ_trunk (Ψ_model) were compared with in vivo measurements via microtensiometers installed in vines under full irrigation or progressively droughted. The resulting Ψ_model values were closely related to actual ones showing a median R² up to approx. 0.95. The model revealed that the daily water released by the compartment to the transpiration stream (up to 0.22 m³ ha⁻¹) makes the orchard almost entirely dependent on root water uptake, posing a significant challenge for irrigation management. The main advantage of the model proposed is the limited number (two) of operational inputs variables supporting the employment of a combination of model and sensors to enable easy, and relatively low-cost monitoring of plant water status and in turn irrigation management.

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土壤水分和蒸汽压亏缺预测大田猕猴桃树干水势

根据猕猴桃土壤含水量（SWC）和空气蒸汽压差（VPD），建立了猕猴桃树干水势（Ψtrunk）的动态预测模型。该模型包括土壤的电容（树干组织），以解释蒸腾和Ψtrunk之间的时间滞后。子模型是根据已知的、校准的或专门开发的关系来定义的，这些关系将SWC或VPD与整个土壤-叶片路径、储存室、植物叶面积和蒸腾的水力阻力联系起来。利用SWC估算土壤水势。将Ψtrunk （Ψmodel）的估计值与安装在葡萄藤上的微张力计在完全灌溉或逐渐干旱条件下的体内测量值进行了比较。所得Ψmodel值与实际值密切相关，显示中位数R2高达约。0.95. 该模型显示，每天由隔间释放到蒸腾流中的水（高达0.22 m³ha⁻）使果园几乎完全依赖于根系吸收水分，这对灌溉管理构成了重大挑战。所提出的模型的主要优点是操作输入变量的数量有限（两个），支持使用模型和传感器的组合，从而实现对植物水分状况的简单和相对低成本的监测，进而实现灌溉管理。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Scientia Horticulturae 农林科学-园艺

CiteScore

8.60

自引率

4.70%

发文量

796

审稿时长

47 days

期刊介绍： Scientia Horticulturae is an international journal publishing research related to horticultural crops. Articles in the journal deal with open or protected production of vegetables, fruits, edible fungi and ornamentals under temperate, subtropical and tropical conditions. Papers in related areas (biochemistry, micropropagation, soil science, plant breeding, plant physiology, phytopathology, etc.) are considered, if they contain information of direct significance to horticulture. Papers on the technical aspects of horticulture (engineering, crop processing, storage, transport etc.) are accepted for publication only if they relate directly to the living product. In the case of plantation crops, those yielding a product that may be used fresh (e.g. tropical vegetables, citrus, bananas, and other fruits) will be considered, while those papers describing the processing of the product (e.g. rubber, tobacco, and quinine) will not. The scope of the journal includes all horticultural crops but does not include speciality crops such as, medicinal crops or forestry crops, such as bamboo. Basic molecular studies without any direct application in horticulture will not be considered for this journal.