Positive influence of apple trees on soil chemical and biological activities in agroecological garden orchard system
2024
Ramananjatovo, T. | Guénon, R. | Peugeot, J. | Chantoiseau, E. | Delaire, M. | Delaire, Mickaël | Guillermin, Pascale | Cannavo, P. | Institut Agro Rennes Angers ; Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro) | Institut de Recherche en Horticulture et Semences (IRHS) ; Université d'Angers (UA)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Rennes Angers ; Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)
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Показать больше [+] Меньше [-]Английский. The aim of this study was to assess the impact of 20-year-old apple trees on the soil quality in an agroforestry system consisting of 2 rows of apple trees with 5 rows of vegetable beds in between. Measurements were carried out for 2 years, from 2019 to 2021, in apple tree rows (R) and in vegetable beds at 1.5 m (B1), 3 m (B2) and 5 m (C) from the apple tree row. Litter quantities and soil organic matter (SOM) content were measured as well as the decomposition rates of apple tree leaf litter. Soil microbial activity was characterized by measuring (1) in-situ soil respiration and (2) basal (BR) and substrate induced respiration (SIR) under controlled conditions. The results showed that proximity to apple trees was linked to higher SOM content. The litter decomposition rate was up to 1.7 times greater under the tree rows than in vegetable beds. The amplitude of in-situ soil CO2 flux variation and the maximum flux were lower under the tree rows than in vegetable beds, mainly due to lower temperature. Under controlled laboratory conditions, we showed that BR was significantly higher in R, B1 and B2 than in C (5, 5, 4.7 and 3.5 mu gC-CO2.h-1.g-1 soil DW, respectively). In addition, the soil in the apple tree rows was more sensitive to the addition of glucose (SIR) than the soil in the vegetable beds. Our results suggest that soil microbial activity was more intensive up to 3 m from the apple trees.
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