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  Plant diversity generates enhanced soil microbial access to recently photosynthesized carbon in the rhizosphere

Mellado-Vázquez, P. G., Lange, M., Bachmann, D., Gockele, A., Karlowsky, S., Milcu, A., et al. (2016). Plant diversity generates enhanced soil microbial access to recently photosynthesized carbon in the rhizosphere. Soil Biology and Biochemistry, 94, 122-132. doi:10.1016/j.soilbio.2015.11.012.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0029-D5FC-5 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-002D-FB7D-2
Genre: Journal Article

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 Creators:
Mellado-Vázquez, Perla Griselle1, 2, Author           
Lange, Markus1, Author           
Bachmann, Doerte, Author
Gockele, Annette, Author
Karlowsky, Stefan1, 2, Author           
Milcu, Alexandru, Author
Piel, Clement, Author
Roscher, Christiane, Author
Roy, Jacques, Author
Gleixner, Gerd1, Author           
Affiliations:
1Molecular Biogeochemistry Group, Dr. G. Gleixner, Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497775              
2IMPRS International Max Planck Research School for Global Biogeochemical Cycles, Max Planck Institute for Biogeochemistry, Max Planck Society, Hans-Knöll-Str. 10, 07745 Jena, DE, ou_1497757              

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Free keywords: ARBUSCULAR MYCORRHIZAL FUNGI; FINE-ROOT PRODUCTION; COMMUNITY COMPOSITION; ORGANIC-MATTER; ELEVATED CO2; EXPERIMENTAL GRASSLANDS; BIODIVERSITY LOSS; LITTER INPUT; MICROORGANISMS; ECOSYSTEMAgriculture; AMF; Carbon cycling; (CO2)-C-13 continuous labelling; NLFA; PLFA; Root associated microorganisms; Root biomass;
 Abstract: Plant diversity positively impacts ecosystem services such as biomass production and soil organic matter (SOM) storage. Both processes counteract increasing atmospheric CO2 concentration and global warming and consequently need better understanding. In general it is assumed that complementary resource use is driving the positive biomass effect and that the rhizospheric microbial community provides the necessary nutrients mineralizing SOM. So far however, it remains unclear how this link between the above and the belowground system is functioning; in detail it remains unclear if a more efficient CO2 uptake at higher diversity levels leads to higher root exudation that stimulate the microbial mineralization. Contrastingly we show here for the first time that more diverse grassland communities provide a better access to root exudates for the rhizospheric community. We applied a continuous (CO2)-C-13 label in a controlled environment (The Montpellier European Ecotron) to ecosystem monoliths from the long-term The Jena Experiment and showed analyzing the delta C-13 content of phospholipid fatty acids and neutral lipid fatty acid that plant diversity increased the plant-derived C uptake of Gram negative bacteria and arbuscular mycorrhizal fungi (AMF). Root biomass but not the amount and delta C-13 content of root sugars positively influenced the plant diversity effect observed on Gram negative bacteria whereas the specific interaction between plant and AMF was independent from any plant trait. Our results demonstrate that plant diversity facilitated the accessibility of plant derived C but not the above-belowground transfer rates. This facilitating effect enabled more diverse plant communities to use complementary C and most likely nutrient resources both from soil organic matter mineralization for better growth. We anticipate from our results that plant diversity effects are less driven by the performance of individuals in mixtures (trait plasticity) but by the combination of individuals that interact independently (trait complementarity). (C) 2015 Elsevier Ltd. All rights reserved.

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Language(s): eng - English
 Dates: 2015-11-192015-12-092016
 Publication Status: Issued
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: Other: BGC2418
DOI: 10.1016/j.soilbio.2015.11.012
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Title: Soil Biology and Biochemistry
  Other : Soil Biol. Biochem.
Source Genre: Journal
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Publ. Info: Amsterdam [u.a.] : Elsevier
Pages: - Volume / Issue: 94 Sequence Number: - Start / End Page: 122 - 132 Identifier: ISSN: 0038-0717
CoNE: https://pure.mpg.de/cone/journals/resource/954925445690