{"id":10612,"date":"2024-08-19T14:50:38","date_gmt":"2024-08-19T13:50:38","guid":{"rendered":"https:\/\/www.idiv.de\/forschung\/projects\/idiv-ecotron\/experiments\/"},"modified":"2026-01-12T10:48:54","modified_gmt":"2026-01-12T09:48:54","slug":"experimente","status":"publish","type":"page","link":"https:\/\/www.idiv.de\/de\/forschung\/projekte\/idiv-ecotron\/experimente\/","title":{"rendered":"Experimente"},"content":{"rendered":"
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Experimente<\/h1><\/div><\/div><\/div><\/div>\n\n\n
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\n AUF DIESER SEITE <\/p>\n Laufende Experimente<\/a>\n Bisherige Experimente<\/a>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/div>\n\n

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Laufende Experimente<\/h2><\/div><\/div><\/div><\/div>\n\n
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JenaTron<\/h3>\n
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How does plant and soil interaction history modify relationships between biodiversity and ecosystem functioning?<\/h4>\n

Over the last three decades, concern about species loss has motivated many studies that experimentally reduce species richness and examine the consequences for ecosystem functioning. So far, results have shown that there is generally a positive association between plants species richness and ecosystem functioning (BEF). Moreover, the strength of this relationship typically gets stronger over time, which can be seen as enhanced functioning in diverse plots, and reduced functioning in monocultures, In Spring and Summer 2022 the JENATRON experiment will test whether the strengthening BEF relationship over time is driven by soil community assembly, shared plant history, or a combined effect of both factors.<\/p>\n

JENATRON will be established in the iDiv Ecotron facility using a plant diversity gradient from 1 to 3 species from the Trait Based Experiment of the Jena Experiment factorially crossed with soil history and plant history. Soil History (+\/- SH) will be established by excavating intact monoliths from the Trait Based Experiment (+SH) or from bare ground plots (-SH). Plant History (+\/- PH) will be established using two seed sources: seeds harvested from plants growing in the Trait Based Experiment for 12 years (+ PH), and original seed material used to set up the Trait Based Experiment (-PH).<\/p>\n

The independent crossing of soil history and plant history for each level of plant species richness results in the following four treatments in each EcoUnit:<\/p>\n

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  1. \u201cwith plant history, with soil history\u201d,<\/li>\n
  2. \u201cwithout plant history, with soil history\u201d,<\/li>\n
  3. \u201cwith plant history, without soil history\u201d, and<\/li>\n
  4. \u201cwithout plant history, without soil history\u201d.<\/li>\n<\/ol>\n

    Eleven sub-projects of the Jena Experiment Research Unit<\/a>\u00a0will work closely together to investigate the independent and interactive effects of plant history and soil history on BEF relationships. Response variables will be measured from many research areas including microbiology, chemical ecology, phenology, proximal sensing, genomics and food web modelling. If soil or plant history alter BEF relationships, an important implication of the results is that novel communities without shared history could be a poor surrogate for long-term conservation.<\/p>\n <\/div>\n\n\n <\/div>\n <\/div>\n

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    \"idiv-Scheme\"idiv-Scheme<\/div><\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/div>\n\n
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    Bisherige Experimente<\/h2><\/div><\/div><\/div><\/div>\n\n\n \n
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    \n NUTRITION: NUtrients TRaits InteracTIONs (2021) \n \n <\/svg>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n \n
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    How does inequity affect system performance?<\/h4>\n
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    Life is not fair. Some areas receive ample resources, while other areas are more depleted. We tested how resource inequity affects model grassland ecosystems, and whether association with mycorrhizal mutualists can facilitate resource distribution and mediate the consequences of inequity. We conceptually subdivided each of 12 EcoUnit landscapes into 25 subplots, and experimentally manipulated the spatial distribution of three macronutrient resources: nitrogen (N), phosphorus (P), and potassium (K). In experimental landscapes where inequity was highest, one of the 25 subplots received all of the NPK resources and 24 of the subplots received no subsidy. In the experimental landscapes where inequity was low, each of the 25 subplots received homogeneous NPK nutrient subsidies. We are currently analyzing the consequences of resource inequity and mycorrhizal associations for distribution of nutrients, as well as magnitude and stability of responses by the plant and soil communities (microbial biomass, respiration, microbial diversity, soil fauna activity).<\/p>\n <\/div>\n\n\n <\/div>\n <\/div>\n

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    \"idiv-\"\/\"idiv-\"\/<\/div><\/div>\n <\/div>\n <\/div>\n <\/div>\n<\/div>\n\n\n \n <\/div>\n <\/div>\n <\/div>\n
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    \n EcoStressWeb (2021) \n \n <\/svg>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n \n
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    Joint impacts of climate and predation on multitrophic communities and ecosystem functioning<\/h4>\n
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    Lead:<\/strong>
    \nDr Malte Jochum (contact:\u00a0malte.jochum@idiv.de<\/a><\/em>)<\/p>\n

    Overarching research question:<\/strong>
    \nHow do simultaneous changes in climate and predator communities affect above-belowground temperate forest communities and ecosystem functioning?<\/p>\n

    Setting:<\/strong>
    \nTemperate forest soil and litter system, above and belowground;\u00a0Fagus sylvatica<\/em>\u00a0and\u00a0Quercus petraea<\/em>\u00a0trees (2 each) planted in each subunit, predators (see treatments) and two collembola species<\/p>\n

    Experimental design:<\/strong>
    \n4 predator levels, 3 climate levels, each of the 12 combinations replicated 4 times (48 replicates = Ecotron Subunits)<\/p>\n

    Treatments:<\/strong>
    \nClimate change (drought) and predator (wolf spider, predatory mite, both, none) treatments<\/p>\n

    Duration:<\/strong>
    \n04\/2021\u201312\/2021<\/p>\n

    Main collaborating teams and staff involved:<\/strong><\/p>\n