Prediction model for sap flow in cacao trees under different radiation intensities in the western Colombian Amazon

Suarez Juan Carlos, Casanoves Fernando, Ngo Bieng Marie-Ange, Melgarejo Luz-Marina, Di Rienzo Julio A., Armas Cristina. 2021. Prediction model for sap flow in cacao trees under different radiation intensities in the western Colombian Amazon. Scientific Reports, 11:10512, 13 p.

https://doi.org/10.1038/s41598-021-89876-z

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Quartile : Q2, Sujet : MULTIDISCIPLINARY SCIENCES

Résumé : In this study, we measured diurnal patterns of sap flow (Vs) in cacao trees growing in three types of agroforestry systems (AFs) that differ in the incident solar radiation they receive. We modeled the relationship of Vs with several microclimatic characteristics of the AFs using mixed linear models. We characterized microclimatic variables that may have an effect on diurnal patterns of sap flow: air relative humidity, air temperature, photosynthetically active radiation and vapor pressure deficit. Overall, our model predicted the differences between cacao Vs in the three different AFs, with cacao plants with dense Musaceae plantation and high mean diurnal incident radiation (HPAR) displaying the highest differences compared to the other agroforestry arrangements. The model was also able to predict situations such as nocturnal transpiration in HPAR and inverse nocturnal sap flows indicative of hydraulic redistribution in the other AFs receiving less incident radiation. Overall, the model we present here can be a useful and cost-effective tool for predicting transpiration and water use in cacao trees, as well as for managing cacao agroforestry systems in the Amazon rainforest.

Mots-clés Agrovoc : physiologie végétale, translocation, Theobroma cacao

Mots-clés géographiques Agrovoc : Colombie

Mots-clés libres : Abiotic, Plant physiology

Classification Agris : F60 - Physiologie et biochimie végétale
F62 - Physiologie végétale - Croissance et développement

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

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