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Madaj, A.M.* ; Huang, Y.* ; Ebeling, A.* ; Ertel, L.* ; Gebler, A.* ; Gleixner, G.* ; Hines, J.* ; Roscher, C.* ; Weigelt, A.* ; Albracht, C.* ; Amyntas, A.* ; Bassi, L.* ; Bonato Asato, A.E.* ; Bonkowski, M.* ; Bröcher, M.* ; Buscot, F.* ; De Giorgi, F.* ; Pinheiro Alves de Souza, Y. ; Doan, V.C.* ; Durka, W.* ; Heintz-Buschart, A.* ; Hennecke, J.* ; Lange, M.* ; Medina-van Berkum, P.* ; Meyer, S.T.* ; Krawczyk, S.* ; Rai, A.* ; Reitz, T.* ; Ristok, C.* ; Scheu, S.* ; Schloter, M. ; Schulz, S. ; Solbach, M.D.* ; Unsicker, S.B.* ; Eisenhauer, N.*

JenaTron - An experimental approach to study the effects of plant history and soil history on grassland ecosystem functioning.

J. Vis. Exp.:22 (2025)

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The global loss of biodiversity has motivated many studies that experimentally vary plant species richness and examine the consequences for ecosystem functioning. Such experiments generally show a positive relationship between above- and below-ground biodiversity and the functioning of terrestrial ecosystems. Moreover, this relationship tends to strengthen over time, seen as enhanced functioning of diverse plant communities and reduced functioning of low-diversity plant communities. Differences in multitrophic community assembly and biotic interactions in high- versus low-diversity plant communities are hypothesized to affect plant performance by altering consumer community structure and function and driving plastic or micro-evolutionary responses of plant species in the plant communities. To resolve this complex interplay of community history, we separated these effects into plant and soil history. Plant history refers to all plant-level responses to past abiotic and biotic selection pressures experienced in their communities, while soil history relates to all abiotic and biotic soil properties developed as a legacy of plant-soil interactions under variable plant diversity. We set up a biodiversity experiment in an Ecotron, a terrestrial mesocosm facility that allows controlling environmental conditions above- and below-ground, to test whether the strengthening biodiversity-ecosystem functioning relationship is due to soil history, plant history, or a combination of both. We established a plant diversity gradient consisting of 1, 2, 3, and 6 grassland plant species and factorially nested with soil history and plant history treatments for each level of plant species richness. Representative results demonstrate the successful establishment of target treatments in the Ecotron experiment, observing the effects of plant and soil history on initial plant development and final plant growth. Additionally, we provide a case study for data analysis of individual response variables. We outline research objectives and methods to comprehensively assess the multifunctional responses to the experimental treatments necessary to ultimately address the overarching hypothesis.

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