Invasive N-fixer impacts on litter decomposition driven by changes to soil properties not litter quality

Broadbent, Arthur A. D. and Orwin, Kate H. and Peltzer, Duane A. and Dickie, Ian and Mason, Norman W. H. and Ostle, Nicholas John and Stevens, Carly Joanne (2017) Invasive N-fixer impacts on litter decomposition driven by changes to soil properties not litter quality. Ecosystems, 20 (6). pp. 1151-1163. ISSN 1432-9840

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Abstract

Invasive nitrogen (N)-fixing plants often fundamentally change key ecosystem functions, particularly N-cycling. However, the consequences of this for litter decomposition, and the mechanisms that underpin ecosystem responses, remain poorly understood. Moreover, few studies have determined how nutrient pools and fluxes shift as invader density increases and whether these effects persist following invader removal, despite the importance of this for understanding the timing and magnitude of invader impacts in ecosystems. We tested how the decomposition rates of four co-occurring grass species were influenced by changes in the density of the globally invasive N-fixing shrub Cytisus scoparius L. (Scotch broom) and whether these effects persisted following invader removal. We used a series of laboratory decomposition assays to disentangle the roles of changes in both litter quality and soil properties associated with increases in broom density. Broom invasion created a soil environment, such as higher rates of net N-mineralisation, which retarded litter decomposition. Litter C/N ratios of co-occurring species decreased as broom density increased, yet this had no effect on decomposition rates. Most relationships between broom density and impacts were nonlinear; this could explain some of the reported variation in invasive species impacts across previous studies that do not account for invader density. Ecosystem properties only partially recovered following invader removal, as broom left a legacy of increased N-availability in both soils and litter. Our findings suggest that invasive N-fixer impacts on soil properties, such as N-availability, were more important than changes in litter quality in altering decomposition rates of co-occurring species.

Item Type: Journal Article
Journal or Publication Title: Ecosystems
Additional Information: © 2016 The Author(s). This article is published with open access at Springerlink.com
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/2300/2304
Subjects:
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 83858
Deposited By: ep_importer_pure
Deposited On: 06 Jan 2017 14:00
Refereed?: Yes
Published?: Published
Last Modified: 14 Feb 2020 04:18
URI: https://eprints.lancs.ac.uk/id/eprint/83858

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