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18 results on '"Ravenek, J.M."'

4. Biodiversity increases multitrophic energy use efficiency, flow and storage in grasslands

Author

Buzhdygan, Oksana Y., Meyer, Sebastian T., Weisser, Wolfgang W., Eisenhauer, Nico, Ebeling, Anne, Borrett, Stuart R., Buchmann, Nina, Cortois, Roeland, De Deyn, Gerlinde B., de Kroon, H., Gleixner, Gerd, Hertzog, Lionel R., Hines, Jes, Lange, Markus, Mommer, Liesje, Ravenek, J.M., Scherber, Christoph, Scherer-Lorenzen, Michael, Scheu, Stefan, Schmid, Bernhard, Steinauer, Katja, Strecker, Tanja, Tietjen, Britta, Vogel, Anja, Weigelt, A., Petermann, Jana S., Buzhdygan, Oksana Y., Meyer, Sebastian T., Weisser, Wolfgang W., Eisenhauer, Nico, Ebeling, Anne, Borrett, Stuart R., Buchmann, Nina, Cortois, Roeland, De Deyn, Gerlinde B., de Kroon, H., Gleixner, Gerd, Hertzog, Lionel R., Hines, Jes, Lange, Markus, Mommer, Liesje, Ravenek, J.M., Scherber, Christoph, Scherer-Lorenzen, Michael, Scheu, Stefan, Schmid, Bernhard, Steinauer, Katja, Strecker, Tanja, Tietjen, Britta, Vogel, Anja, Weigelt, A., and Petermann, Jana S.

Abstract

Contains fulltext : 222327.pdf (publisher's version ) (Closed access)

Published
2020

6. Below-ground complementarity effects in a grassland biodiversity experiment are related to deep-rooting species

Author

Oram, N.J., Ravenek, J.M., Barry, K.E., Weigelt, A., Chen, Hongmei, Gessler, A., de Kroon, H., Smit-Tiekstra, A., Ruijven, J. van, Mommer, Liesje, Oram, N.J., Ravenek, J.M., Barry, K.E., Weigelt, A., Chen, Hongmei, Gessler, A., de Kroon, H., Smit-Tiekstra, A., Ruijven, J. van, and Mommer, Liesje

Abstract

Contains fulltext : 180925.pdf (publisher's version ) (Closed access)

Published
2018

7. Below-ground resource partitioning alone cannot explain the biodiversity–ecosystem function relationship: A field test using multiple tracers

Author

Jesch, Annette, Barry, Kathryn E., Ravenek, J.M., Bachmann, Dörte, Strecker, Tanja, Weigelt, A., Buchmann, Nina, Kroon, J.C.J.M. de, Gessler, Arthur, Mommer, Liesje, Roscher, Christiane, Scherer-Lorenzen, Michael, Jesch, Annette, Barry, Kathryn E., Ravenek, J.M., Bachmann, Dörte, Strecker, Tanja, Weigelt, A., Buchmann, Nina, Kroon, J.C.J.M. de, Gessler, Arthur, Mommer, Liesje, Roscher, Christiane, and Scherer-Lorenzen, Michael

Abstract

Contains fulltext : 195331.pdf (publisher's version ) (Closed access)

Published
2018

8. Below‐ground resource partitioning alone cannot explain the biodiversity–ecosystem function relationship: A field test using multiple tracers

Author

Jesch, A., Barry, K.E., Ravenek, J.M., Bachmann, D., Strecker, T., Weigelt, A., Buchmann, N., de Kroon, H., Gessler, A., Mommer, L., Roscher, Christiane, Scherer‐Lorenzen, M., Jesch, A., Barry, K.E., Ravenek, J.M., Bachmann, D., Strecker, T., Weigelt, A., Buchmann, N., de Kroon, H., Gessler, A., Mommer, L., Roscher, Christiane, and Scherer‐Lorenzen, M.

Abstract

Below‐ground resource partitioning is among the most prominent hypotheses for driving the positive biodiversity–ecosystem function relationship. However, experimental tests of this hypothesis in biodiversity experiments are scarce, and the available evidence is not consistent.We tested the hypothesis that resource partitioning in space, in time or in both space and time combined drives the positive effect of diversity on both plant productivity and total community resource uptake. At the community level, we predicted that total community resource uptake and biomass production above‐ and below‐ground will increase with increased species richness or functional group richness. We predicted that, at the species level, resource partition breadth will become narrower, and that overlap between the resource partitions of different species will become smaller with increasing species richness or functional group richness.We applied multiple resource tracers (Li and Rb as potassium analogues, the water isotopologues—H218O and 2H2O, and 15N) in three seasons at two depths across a species and functional group richness gradient at a grassland biodiversity experiment. We used this multidimensional resource tracer study to test if plant species partition resources with increasing plant diversity across space, time or both simultaneously. At the community level, total community resource uptake of nitrogen and potassium and above‐ and below‐ground biomass increased significantly with increasing species richness but not with increasing functional group richness. However, we found no evidence that resource partition breadth or resource partition overlap decreased with increasing species richness for any resource in space, time or both space and time combined.Synthesis. These findings indicate that below‐ground resource partitioning may not drive the enhanced resource uptake or biomass production found here. Instead, other mechanisms such as facilitation, species‐specific biotic feedba

Published
2018

9. Plants are less negatively affected by flooding when growing in species-rich plant communities

Author

Wright, A.J., de Kroon, H., Visser, E.J.W., Buchmann, T., Ebeling, A., Eisenhauer, N., Fischer, C., Hildebrandt, A., Ravenek, J.M., Roscher, C., Weigelt, A., Weisser, W., Voesenek, L.A.C.J., Mommer, L., Wright, A.J., de Kroon, H., Visser, E.J.W., Buchmann, T., Ebeling, A., Eisenhauer, N., Fischer, C., Hildebrandt, A., Ravenek, J.M., Roscher, C., Weigelt, A., Weisser, W., Voesenek, L.A.C.J., and Mommer, L.

Abstract

Contains fulltext : 166382.pdf (publisher's version ) (Closed access)

Published
2017

10. Linking root traits and competitive success in grassland species

Author

Ravenek, J.M., Mommer, L., Visser, E.J.W., van Ruijven, J., van der Paauw, J.W., Smit-Tiekstra, A., Caluwe, H. de, de Kroon, H., Ravenek, J.M., Mommer, L., Visser, E.J.W., van Ruijven, J., van der Paauw, J.W., Smit-Tiekstra, A., Caluwe, H. de, and de Kroon, H.

Abstract

Contains fulltext : 163318.pdf (publisher's version ) (Open Access)

Published
2016

11. Effects of biodiversity strengthen over time as ecosystem functioning declines at low and increases at high biodiversity

Author

Meyer, S.T., Ebeling, A., Eisenhauer, N., Hertzog, L., Hillebrand, H., Milcu, A., Pompe, S., Abbas, M., Bessler, H., Buchmann, N., De Luca, E., Engels, C., Fischer, M., Gleixner, G., Hudewenz, A., Klein, A.-M., de Kroon, H., Leimer, S., Loranger, H., Mommer, L., Oelmann, Y., Ravenek, J.M., Roscher, Christiane, Rottstock, T., Scherber, C., Scherer-Lorenzen, M., Scheu, S., Schmid, B., Schulze, E.-D., Staudler, A., Strecker, T., Temperton, V., Tscharntke, T., Vogel, A., Voigt, W., Weigelt, A., Wilcke, W., Weisser, W.W., Meyer, S.T., Ebeling, A., Eisenhauer, N., Hertzog, L., Hillebrand, H., Milcu, A., Pompe, S., Abbas, M., Bessler, H., Buchmann, N., De Luca, E., Engels, C., Fischer, M., Gleixner, G., Hudewenz, A., Klein, A.-M., de Kroon, H., Leimer, S., Loranger, H., Mommer, L., Oelmann, Y., Ravenek, J.M., Roscher, Christiane, Rottstock, T., Scherber, C., Scherer-Lorenzen, M., Scheu, S., Schmid, B., Schulze, E.-D., Staudler, A., Strecker, T., Temperton, V., Tscharntke, T., Vogel, A., Voigt, W., Weigelt, A., Wilcke, W., and Weisser, W.W.

Abstract

Human-caused declines in biodiversity have stimulated intensive research on the consequences of biodiversity loss for ecosystem services and policy initiatives to preserve the functioning of ecosystems. Short-term biodiversity experiments have documented positive effects of plant species richness on many ecosystem functions, and longer-term studies indicate, for some ecosystem functions, that biodiversity effects can become stronger over time. Theoretically, a biodiversity effect can strengthen over time by an increasing performance of high-diversity communities, by a decreasing performance of low-diversity communities, or a combination of both processes. Which of these two mechanisms prevail, and whether the increase in the biodiversity effect over time is a general property of many functions remains currently unclear. These questions are an important knowledge gap as a continuing decline in the performance of low-diversity communities would indicate an ecosystem-service debt resulting from delayed effects of species loss on ecosystem functioning. Conversely, an increased performance of high-diversity communities over time would indicate that the benefits of biodiversity are generally underestimated in short-term studies. Analyzing 50 ecosystem variables over 11 years in the world's largest grassland biodiversity experiment, we show that overall plant diversity effects strengthened over time. Strengthening biodiversity effects were independent of the considered compartment (above- or belowground), organizational level (ecosystem variables associated with the abiotic habitat, primary producers, or higher trophic levels such as herbivores and pollinators), and variable type (measurements of pools or rates). We found evidence that biodiversity effects strengthened because of both a progressive decrease in functioning in species-poor and a progressive increase in functioning in species-rich communities. Our findings provide evidence that negative feedback effe

Published
2016

12. No evidence of complementary water use along a plant species richness gradient in temperate experimental grasslands

Author

Bachmann, D., Gockele, A., Ravenek, J.M., Roscher, C., Strecker, T., Weigelt, A., and Buchmann, N.

Subjects
Biodiversity, Functional groups, Grasslands, Herbs, Legumes, Plants, Species diversity, Xylem, Plant Ecology, lcsh:R, lcsh:Medicine, food and beverages, Water, Poaceae, complex mixtures, Grassland, Plant Roots, Soil, lcsh:Q, Biomass, lcsh:Science, GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries), Ecosystem, Research Article
Abstract

Niche complementarity in resource use has been proposed as a key mechanism to explain the positive effects of increasing plant species richness on ecosystem processes, in particular on primary productivity. Since hardly any information is available for niche complementarity in water use, we tested the effects of plant diversity on spatial and temporal complementarity in water uptake in experimental grasslands by using stable water isotopes. We hypothesized that water uptake from deeper soil depths increases in more diverse compared to low diverse plant species mixtures. We labeled soil water in 8 cm (with 18O) and 28 cm depth (with ²H) three times during the 2011 growing season in 40 temperate grassland communities of varying species richness (2, 4, 8 and 16 species) and functional group number and composition (legumes, grasses, tall herbs, small herbs). Stable isotope analyses of xylem and soil water allowed identifying the preferential depth of water uptake. Higher enrichment in 18O of xylem water than in ²H suggested that the main water uptake was in the upper soil layer. Furthermore, our results revealed no differences in root water uptake among communities with different species richness, different number of functional groups or with time. Thus, our results do not support the hypothesis of increased complementarity in water use in more diverse than in less diverse communities of temperate grassland species. ISSN:1932-6203

Published
2014

13. Plant diversity shapes microbe-rhizosphere effects on P mobilisation from organic matter in soil

Author

Hacker, N., Ebeling, A., Gessler, A., Gleixner, G., Mace, O.G., de Kroon, H., Lange, M., Mommer, L., Eisenhauer, N., Ravenek, J.M., Scheu, S., Weigelt, A., Wagg, C., Wilcke, W., Oelmann, Y., Hacker, N., Ebeling, A., Gessler, A., Gleixner, G., Mace, O.G., de Kroon, H., Lange, M., Mommer, L., Eisenhauer, N., Ravenek, J.M., Scheu, S., Weigelt, A., Wagg, C., Wilcke, W., and Oelmann, Y.

Abstract

Contains fulltext : 149066.pdf (publisher's version ) (Closed access)

Published
2015

18. Long-term study of root biomass in a biodiversity experiment reveals shifts in diversity effects over time

Author

Ravenek, J.M., Bessler, H., Engels, C., Scherer-Lorenzen, M., Gessler, A., Gockele, A., Luca, E. De, Temperton, V.M., Ebeling, A., Roscher, C., Schmid, B., Weisser, W.W., Wirth, C., Kroon, H. de, Weigelt, A., Mommer, L., Ravenek, J.M., Bessler, H., Engels, C., Scherer-Lorenzen, M., Gessler, A., Gockele, A., Luca, E. De, Temperton, V.M., Ebeling, A., Roscher, C., Schmid, B., Weisser, W.W., Wirth, C., Kroon, H. de, Weigelt, A., and Mommer, L.

Abstract

Contains fulltext : 135489.pdf (publisher's version ) (Closed access)

Published
2014

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