Functional diversity and identity of plant genotypes regulate rhizodeposition and soil microbial activity

TitleFunctional diversity and identity of plant genotypes regulate rhizodeposition and soil microbial activity
Publication TypeJournal Article
Year of Publication2021
AuthorsSemchenko M., Xue P.A, Leigh T.
JournalNew Phytologist
Volume232
Pagination776-787
Date PublishedOct
Type of ArticleArticle
ISBN Number0028-646X
Accession NumberWOS:000680939500001
KeywordsAnthoxanthum odoratum, biodiversity loss, communities, consequences, decomposition, extraction method, functional traits, genetic diversity, leaf economics, litter, litter decomposition, microbial respiration, park-grass-experiment, Plant Sciences, Rhizodeposition, root, root exudates, Soil functioning, TRAITS
Abstract

Our understanding of the linkages between plant diversity and soil carbon and nutrient cycling is primarily derived from studies at the species level, while the importance and mechanisms of diversity effects at the genotype level are poorly understood. Here we examine how genotypic diversity and identity, and associated variation in functional traits, within a common grass species, Anthoxanthum odoratum, modified rhizodeposition, soil microbial activity and litter decomposition. Root litter quality was not significantly affected by plant genotypic diversity, but decomposition was enhanced in soils with the legacy of higher genotypic diversity. Plant genotypic diversity and identity modified rhizodeposition and associated microbial activity via two independent pathways. Plant genotypic diversity enhanced soil functioning via positive effects on variation in specific leaf area and total rhizodeposition. Genotype identity affected both rhizodeposit quantity and quality, and these effects were mediated by differences in mean specific leaf area, shoot mass and plant height. Rhizodeposition was more strongly predicted by aboveground than belowground traits, suggesting strong linkages between photosynthesis and root exudation. Our study demonstrates that functional diversity and identity of plant genotypes modulates belowground carbon supply and quality, representing an important but overlooked pathway by which biodiversity affects ecosystem functioning.

Short TitleNew Phytol.New Phytol.
Alternate JournalNew Phytol.
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Times Cited: 3
Cited Reference Count: 95
Semchenko, Marina Xue, Piao Leigh, Tomas
Semchenko, Marina/AFS-2075-2022
Leigh, Tomas/0000-0003-4103-8649
University of Manchester; UK Biotechnology and Biological Sciences Research Council under the National Capabilities programme grantUK Research & Innovation (UKRI)Biotechnology and Biological Sciences Research Council (BBSRC) [BBS/E/C/000J0300]; Lawes Agricultural Trust
This study was supported by the University of Manchester. We thank Andy Macdonald and Steve Freeman for help in collecting samples from the Park Grass Experiment, Jonathan Storkey for valuable discussions and three anonymous reviewers for helpful suggestions. The Rothamsted Long-term Experiments are supported by the UK Biotechnology and Biological Sciences Research Council under the National Capabilities programme grant (BBS/E/C/000J0300), and by the Lawes Agricultural Trust.
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Semchenko, M (corresponding author), Univ Manchester, Dept Earth & Environm Sci, Oxford Rd, Manchester M13 9PT, Lancs, England.; Semchenko, M (corresponding author), Univ Tartu, Inst Ecol & Earth Sci, Lai 40, EE-51005 Tartu, Estonia.
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