Modern intensive agricultural systems generally focus on the productivity of monocultures. They are characterized by a low diversity of crops, with uniform and symmetrical planting layouts. They largely rely on the utilization of chemical inputs. They are widely denounced for their negative environmental impacts. In this context, the ecological intensification framework proposes the exploitation of biodiversity in order to better achieve such ecosystem services and soil conservation. Intercropping, i.e., the simultaneous growth of two or more crops mixed in the same field, appears to have the potentialities to improve the productivity, resilience capacity, and ecological sustainability of agroecosystems through the intensification of such positive interactions between plants as facilitation and niche complementarity. Cereal–legume intercropping turns out to be effective in low-N agroecosystems, since legumes have the ability to fix atmospheric nitrogen via their symbiosis with rhizobia. This fixed N, in turn, benefits the cereal through various ecological processes. The objective of the project is to improve the benefit of legumes for intercropped cereals in low-input agroecosystems through the management of plant–plant and plant–microbe interactions. The nitrogen-fixing symbiosis requires phosphorus and iron to be efficient. While these nutrients are prone to be lacking in N-limited agroecosystems, as is the case in Mediterranean agroecosystems, plant–plant interactions and rhizobacteria and mycorrhiza interactions seem to play an important role in their acquisition and efficient utilization. We propose the development of a participatory research project in four Mediterranean agroecosystems. Agronomic and environmental diagnosis will be performed in the field to assess N and P biogeochemical cycles, as well as Fe availability, in combination with the plant performances and the diversity of soil microorganisms. Molecular identification of soil microorganisms from the most productive sites will be done and research of genes for tolerance to Fe- and P-deficiencies will be realized. Glasshouse experiments involving various cultivars of cereals and legumes, as well as the previously identified microorganisms, will be done in order to disentangle the various mechanisms of nutrient acquisition, sharing, and transfer between plants. Other experiments will assess the effects of cereal–legume–microbe interactions on the development and architecture of the plant root systems and root hair development. The lines of research are integrated with a strategy of functional ecology on plant–microbe–soil interactions in the agroecosystems of Gabès (Tunisia), Boumedfaa (Algeria), Beni Mellal (Morocco), and Thessaloniki (Greece). Using multidisciplinary and innovative approaches, the program will provide novel knowledge and understanding of agroecosystem management for food production.

The functioning of temperate forests is based on a symbiosis linking trees to a vast diversity of ectomycorrhizal (EM) fungi. Although disturbance is a major driver of biodiversity patterns in these ecosystems, its effects on the fine-scale distribution and the short-term dynamics of EM fungal communities are still largely unknown. We used an in situ experiment combined with the analysis of the ITS rDNA region of EM root tips to compare the composition of fungal communities before and one year after small-scale soil disturbance simulating animal bioturbation. Disturbance induced a transient increase in EM root tip abundance, a 56.3% decrease in species richness and a marked composition turnover. One year after disturbance, the proportion of Ascomycota had increased by 38.5% to represent 49.3% of the total number of mycorrhizae. This shift was associated with an increase in Pezizales (Tuberaceae, Helvellaceae, Pezizaceae and Pyronemataceae) and a decrease in Russulaceae, Cortinariaceae and Hydnaceae. The results show that small-scale soil disturbances promote highly localized fungal successions, from late-colonizing Basidiomycota lineages to early-colonizing Ascomycota. In temperate ecosystems, asynchronous small-scale disturbances may contribute to ectomycorrhizal community richness (α-diversity) and spatial turnover (β-diversity) by generating fine-scale spatial heterogeneity within forests.

Introduction Mediterranean landscapes are social-ecological systems (SES) shaped by interactions among highly diversified biotas at different ecological scales, coupled with human activities since the Neolithic (Grove and Rackham 2003). They host a large diversity of agrosylvopastoral systems that mimic dryland savannahs, and combinations of interconnected and complementary terraces, pastures and forests. Mediterranean SES provide food security through simultaneously producing fodder, pasture l...