| Title: | Root traits predict decomposition across a landscape-scale grazing experiment |
| Author(s): | Smith SW; Woodin SJ; Pakeman RJ; Johnson D; van der Wal R; |
| Address: | "IBES, University of Aberdeen, St Machar Drive, Aberdeen, AB24 3UU, UK; The James Hutton Institute, Craigiebuckler, Aberdeen, AB15 8QH, UK; ACES, University of Aberdeen, St Machar Drive, Aberdeen, AB24 3UU, UK" |
| ISSN/ISBN: | 1469-8137 (Electronic) 0028-646X (Print) 0028-646X (Linking) |
| Abstract: | "Root litter is the dominant soil carbon and nutrient input in many ecosystems, yet few studies have considered how root decomposition is regulated at the landscape scale and how this is mediated by land-use management practices. Large herbivores can potentially influence below-ground decomposition through changes in soil microclimate (temperature and moisture) and changes in plant species composition (root traits). To investigate such herbivore-induced changes, we quantified annual root decomposition of upland grassland species in situ across a landscape-scale livestock grazing experiment, in a common-garden experiment and in laboratory microcosms evaluating the influence of key root traits on decomposition. Livestock grazing increased soil temperatures, but this did not affect root decomposition. Grazing had no effect on soil moisture, but wetter soils retarded root decomposition. Species-specific decomposition rates were similar across all grazing treatments, and species differences were maintained in the common-garden experiment, suggesting an overriding importance of litter type. Supporting this, in microcosms, roots with lower specific root area (m(2) g(-1)) or those with higher phosphorus concentrations decomposed faster. Our results suggest that large herbivores alter below-ground carbon and nitrogen dynamics more through their effects on plant species composition and associated root traits than through effects on the soil microclimate" |
| Keywords: | "Animals Carbon/analysis Herbivory/*physiology Humidity Livestock Microclimate Nitrogen/analysis Plant Roots/anatomy & histology/*physiology Poaceae/*physiology *Quantitative Trait, Heritable Scotland Soil/chemistry Species Specificity Temperature carbon (;" |
| Notes: | "MedlineSmith, Stuart W Woodin, Sarah J Pakeman, Robin J Johnson, David van der Wal, Rene eng Biotechnology and Biological Sciences Research Council/United Kingdom Research Support, Non-U.S. Gov't England 2014/05/21 New Phytol. 2014 Aug; 203(3):851-62. doi: 10.1111/nph.12845. Epub 2014 May 20" |
