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University of Saskatchewan (2019)

Vegetation and Soil Biodiversity Across Perennial Grassland-Annual Cropland Edges

Aguiar, Mariah

Titre : Vegetation and Soil Biodiversity Across Perennial Grassland-Annual Cropland Edges

Auteur : Aguiar, Mariah

Université de soutenance : University of Saskatchewan

Grade : Master of Science (M.Sc.) 2019

The agroecosystem is composed of a mosaic of land uses and management types. As such, edges are prevalent and can have biological and physical effects on the surrounding area. For a deeper understanding of edge effects, both aboveground and belowground processes must be considered. To address edge effects in the agroecosystem, we investigated both aboveground and belowground properties across perennial grassland-annual cropland edges in central Saskatchewan, Canada. Specifically, we examined aboveground vegetation, belowground soil properties, belowground vegetation, and soil microbial community composition across edges of managed perennial grasslands and croplands. An a priori structural equation model (SEM) was created to analyze relationships between aboveground and belowground changes across the edge, specifically looking at drivers of the soil microbial community. Overall, our SEMs demonstrated that soil total nitrogen positively influenced bacterial richness and bacterial richness negatively influenced fungal richness. Belowground plant richness, rather than aboveground plant richness, had a positive relationship with fungal richness. Aboveground living biomass was a positive driver of soil total carbon and total nitrogen. At the community level, soil bacteria and fungi appear to be directly influenced by soil properties and microbial interactions, rather than plants directly. However, further investigation into the fungal community revealed specific fungal genera abundance was influenced by plant richness, while some were not ; and may be due to specific plant associations. Understanding edge effects in the agroecosystem may aid in developing better management practices, bringing benefits to both the producer and agroecosystem health and resilience.


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