Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 498226
Title Legume presence reduces the decomposition rate of non-legume roots
Author(s) Saar, S.; Semchenko, M.; Barel, J.M.; Deyn, G.B. De
Source Soil Biology and Biochemistry 94 (2016). - ISSN 0038-0717 - p. 88 - 93.
DOI http://dx.doi.org/10.1016/j.soilbio.2015.11.026
Department(s) Chair Soil Biology and Biological Soil Quality
Sub-department of Soil Quality
PE&RC
Publication type Refereed Article in a scientific journal
Publication year 2016
Keyword(s) Litter decomposition - Litter quality - Nutrient effects - Plant litter interaction - Rhizosphere priming effect - Root decomposition
Abstract

Living plants can enhance litter decomposition rates via a priming effect by releasing root exudates which provide energy to saprotrophic microbes and thereby enable them to degrade litter faster. The strength of this effect, however, is expected to be dependent on the litter properties. To test whether the presence of a growing plant affects the decomposition rate of dead roots with different traits, we used dead roots of seven species (3 grasses, 3 legumes, 1 forb) as litter and quantified litter mass loss after eight weeks of incubation in soil with or without a growing white clover (Trifolium repens) plant. We expected root decomposition to be faster in the presence of T. repens, especially for roots with high C:N ratio. We found that the presence of T. repens slowed down the decomposition of grass and forb roots (negative priming), while it did not significantly affect the decomposition of legume roots. Our results show that root decomposition can be slowed down in the presence of a living plant and that this effect depends on the properties of the decomposing roots, with a pronounced reduction in root litter poor in N and P, but not in the relatively nutrient-rich legume root litters. Negative priming effect of legume plants on non-legume litter decomposition may have resulted from preferential substrate utilisation by soil microbes

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