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Spatial zoning of microbial functions and plant-soil nitrogen dynamics across a riparian area in an extensively grazed livestock system

de Sosa, Laura L.; Glanville, Helen C.; Marshall, Miles R.; Williams, A. Prysor; Abadie, Maïder; Clark, Ian M.; Blaud, Aimeric; Jones, Davey L.

Authors

Laura L. de Sosa

Helen C. Glanville

Miles R. Marshall

A. Prysor Williams

Maïder Abadie

Ian M. Clark

Davey L. Jones



Abstract

Anthropogenic activities have significantly altered global biogeochemical nitrogen (N) cycling leading to major environmental problems such as freshwater eutrophication, biodiversity loss and enhanced greenhouse gas emissions. The soils in the riparian interface between terrestrial and aquatic ecosystems may prevent excess N from entering freshwaters (e.g. via plant uptake, microbial transformations and denitrification). Although these processes are well documented in intensively managed agroecosystems, our understanding of riparian N removal in semi-natural systems remains poor. Our aim was to assess the spatial zoning of soil microbial communities (PLFA), N cycling gene abundance (archaeal and bacterial amoA, nifH, nirK, nirS, nosZ), N processing rates and plant N uptake across an extensively sheep grazed riparian area. As expected, soil properties differed greatly across the riparian transect, with significant decreases in organic matter, NH4+, carbon (C) and N content closest to the river (10 m), while ammonia oxidising archaea (AOA) increased in abundance towards the river. N2O emissions rates were limited by C and to a lesser extent by N with greater emissions close to the river. Plant uptake of urea-derived 15N was high (ca. 55–70% of that added to the soil) but 30–65% of the N was potentially lost by denitrification or leaching. Percentage recovered also suggests that the spatial patterning of plant and microbial N removal processes are different across the riparian zone. Our study provides novel insights into the underlying mechanisms controlling the spatial variability of N cycling in semi-natural riparian ecosystems.

Journal Article Type Article
Acceptance Date Feb 7, 2018
Online Publication Date Feb 16, 2018
Publication Date 2018-05
Deposit Date Nov 30, 2018
Publicly Available Date Oct 7, 2020
Journal Soil Biology and Biochemistry
Print ISSN 0038-0717
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 120
Pages 153-164
DOI https://doi.org/10.1016/j.soilbio.2018.02.004
Keywords Buffer strip, Ecosystem services, DON, Nitrification, Heathland, Wetlands
Public URL http://researchrepository.napier.ac.uk/Output/1345407

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Spatial Zoning Of Microbial Functions And Plant-soil Nitrogen Dynamics Across A Riparian Area In An Extensively Grazed Livestock System (accepted version) (2.1 Mb)
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Licence
http://creativecommons.org/licenses/by-nc-nd/4.0/

Copyright Statement
This accepted manuscript is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) license.






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