Common mycorrhizal networks amplify size inequality in Andropogon gerardii monocultures

• DOI: 10.1111/nph.12125
• Publication Date: 2013-01-29T13:41:38Z
• Authors: Joanna Weremijewicz; David P. Janos
• Keywords: Monoculture; Microcosm; Root system

Summary Arbuscular mycorrhizal fungi can interconnect plant root systems through hyphal common networks, which may influence the distribution of limiting mineral nutrients among interconnected individuals, potentially affecting competition and consequent size inequality. Using a microcosm model system, we investigated whether members A ndropogon gerardii monocultures compete via networks. We grew . seedlings with isolated in individual, adjacent containers while preventing, disrupting or allowing networks them. Fertile soil was placed within containers, were embedded infertile sand. assessed mycorrhizas, leaf tissue nutrient concentrations, hierarchies growth nearest neighbors. Plants by had 8% greater colonized length, 12% higher phosphorus 35% manganese concentrations than plants severed from Interconnected were, on average, 15% larger 32% inequality, as reflected G ini coefficients, those connections. Only intact whole‐plant dry weights negatively associated their In absence system overlap, likely promote asymmetric below ground, thereby exaggerating inequality populations.