Abstract

ALVAREZ, Belén et al. Impact of maintenance techniques for woody crops (olive trees and vines) on the bacterial and fungal biomass of the soil, in the region of “Las Vegas of Madrid”. Rev. de Ciências Agrárias [online]. 2022, vol.45, n.4, pp.671-680.  Epub Dec 01, 2022. ISSN 0871-018X.  https://doi.org/10.19084/rca.28567.

The aim of this study was to evaluate the effect of different maintenance practices (tillage and mulching) applied in woody crops on soil parameters related to water availability and how these changes modulate the abundance of bacteria and fungi. The study was carried out in 24 farms (22 olive tree grovess and 2 vineyards) established in the Las Vegas de Madrid area. We carried out soil sampling at a 0-10 cm depth. We assessed chemical parameters (pH, total organic carbon -TOC-), physical parameters related to water availability (permanent wilting point -PMP-, macropores, mesopores, micropores, water stable aggregates WSA- and bulk density -BD-) and we quantified bacterial and fungal biomass. Then, we performed a multivariate analysis (Partial Least Squares Regression PLS-) to quantify the relationship between soil variables and bacterial and fungal biomass, The results indicate that the water availability in the soil (PMP) modulated the abundance of bacteria, while fungi, in contrast to bacteria, responded positively to soil carbon and negatively to BD. Our analyses indicate that, under these study conditions, bacteria were more sensitive to water availability while fungi were more sensitive to changes in soil compaction.

Keywords : traditional tillage; bacterium; fungus; PLS; porosity.

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