Resistance of soil protein depolymerization rates to eight years of elevated CO2, warming, and summer drought in a temperate heathland

Wild, Birgit; Ambus, Per; Reinsch, Sabine ORCID: https://orcid.org/0000-0003-4649-0677; Richter, Andreas. 2018 Resistance of soil protein depolymerization rates to eight years of elevated CO2, warming, and summer drought in a temperate heathland. Biogeochemistry, 140 (3). 255-267. https://doi.org/10.1007/s10533-018-0487-1

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Abstract/Summary

Soil N availability for plants and microorganisms depends on the breakdown of soil polymers such as proteins into smaller, assimilable units by microbial extracellular enzymes. Changing climatic conditions are expected to alter protein depolymerization rates over the next decades, and thereby affect the potential for plant productivity. We here tested the effect of increased CO2 concentration, temperature, and drought frequency on gross rates of protein depolymerization, N mineralization, microbial amino acid and ammonium uptake using 15N pool dilution assays. Soils were sampled in fall 2013 from the multifactorial climate change experiment CLIMAITE that simulates increased CO2 concentration, temperature, and drought frequency in a fully factorial design in a temperate heathland. Eight years after treatment initiation, we found no significant effect of any climate manipulation treatment, alone or in combination, on protein depolymerization rates. Nitrogen mineralization, amino acid and ammonium uptake showed no significant individual treatment effects, but significant interactive effects of warming and drought. Combined effects of all three treatments were not significant for any of the measured parameters. Our findings therefore do not suggest an accelerated release of amino acids from soil proteins in a future climate at this site that could sustain higher plant productivity.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1007/s10533-018-0487-1
UKCEH and CEH Sections/Science Areas:	Soils and Land Use (Science Area 2017-)
ISSN:	0168-2563
Additional Information. Not used in RCUK Gateway to Research.:	Open Access paper - full text available via Official URL link.
Additional Keywords:	free air CO2 enrichment, nitrogen mining, nitrogen use efficiency, nitrogen mineralization
NORA Subject Terms:	Agriculture and Soil Science
Date made live:	24 Sep 2018 10:47 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/521031

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