Eze, S, Palmer, SM orcid.org/0000-0001-7689-001X and Chapman, PJ orcid.org/0000-0003-0438-6855 (2018) Negative effects of climate change on upland grassland productivity and carbon fluxes are not attenuated by nitrogen status. Science of the Total Environment, 637-638. pp. 398-407. ISSN 0048-9697
Abstract
Effects of climate change on managed grassland carbon (C) fluxes and biomass production are not well understood. In this study, we investigated the individual and interactive effects of experimental warming (+3 °C above ambient summer daily range of 9–12 °C), supplemental precipitation (333 mm +15%) and drought (333 mm −23%) on plant biomass, microbial biomass C (MBC), net ecosystem exchange (NEE) and dissolved organic C (DOC) flux in soil cores from two upland grasslands of different soil nitrogen (N) status (0.54% and 0.37%) in the UK. After one month of acclimation to ambient summer temperature and precipitation, five replicate cores of each treatment were subjected to three months of experimental warming, drought and supplemental precipitation, based on the projected regional summer climate by the end of the 21st Century, in a fully factorial design. NEE and DOC flux were measured throughout the experimental duration, alongside other environmental variables including soil temperature and moisture. Plant biomass and MBC were determined at the end of the experiment. Results showed that warming plus drought resulted in a significant decline in belowground plant biomass (−29 to −37%), aboveground plant biomass (−35 to −77%) and NEE (−13 to −29%), regardless of the N status of the soil. Supplemental precipitation could not reverse the negative effects of warming on the net ecosystem C uptake and plant biomass production. This was attributed to physiological stress imposed by warming which suggests that future summer climate will reduce the C sink capacity of the grasslands. Due to the low moisture retention observed in this study, and to verify our findings, it is recommended that future experiments aimed at measuring soil C dynamics under climate change should be carried out under field conditions. Longer term experiments are recommended to account for seasonal and annual variability, and adaptive changes in biota.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | Copyright (c) 2018 Elsevier B. V. All rights reserved. This is an author produced version of a paper published in Science of The Total Environment. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Climate change; Warming; Drought; Carbon flux; Grassland management; Biomass productivity |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Earth Surface Science Institute (ESSI) (Leeds) The University of Leeds > Faculty of Environment (Leeds) > School of Geography (Leeds) > River Basin Processes & Management (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 10 May 2018 12:04 |
Last Modified: | 18 Sep 2020 16:27 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.scitotenv.2018.05.032 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:130622 |