Effects of tree features on hydrophysical soil properties in European agroforestry systems: systematic review

Abstract

Hydrophysical soil properties are critical determinants of agricultural sustainability and ecosystem resilience. These properties influence soil-water dynamics, nutrient cycling, and overall soil health. Although the potential of agroforestry to mitigate soil degradation is well-established, a comprehensive synthesis of its effects on hydrophysical properties in European contexts has been lacking. This review systematically analyzes 40 studies examining the effects of woody vegetation in European Agroforestry Systems (EAFS). Findings reveal that woody components generally enhance hydrophysical soil properties across diverse EAFS. A consistent decrease in bulk density and increase in porosity were reported, leading to improved water infiltration, retention, and storage capacities. Hedgerows and shelterbelts were particularly effective in increasing hydraulic conductivity and mitigating surface runoff and erosion, with positive effects localized near woody vegetation. Silvopastoral systems demonstrated significant improvements in soil water content and infiltration rates, particularly in Mediterranean regions. However, variability was evident, influenced by tree age, species composition, spatial configurations, and management practices. Critical research gaps were identified, including limited data on subsoil dynamics, geographic biases favouring Mediterranean systems, and methodological inconsistencies across studies. Addressing these gaps through standardized protocols and multidisciplinary approaches is essential to fully realise the potential of EAFS in enhancing soil functions and adapting agro-ecosystems to climate challenges. Implementing tailored management practices that consider local climatic and edaphic conditions is essential for maximizing the hydrological and ecological benefits of EAFS.