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Sediment respiration pulses in intermittent rivers and ephemeral streams

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posted on 2019-11-01, 16:56 authored by D Schiller, T Datry, R Corti, A Foulquier, K Tockner, R Marcé, G García‐Baquero, I Odriozola, B Obrador, A Elosegi, C Mendoza‐Lera, MO Gessner, R Stubbington, R Albariño, DC Allen, F Altermatt, MI Arce, S Arnon, D Banas, A Banegas‐Medina, E Beller, ML Blanchette, JF Blanco‐Libreros, J Blessing, IG Boëchat, KS Boersma, MT Bogan, N Bonada, NR Bond, K Brintrup, A Bruder, RM Burrows, T Cancellario, SM Carlson, S Cauvy‐Fraunié, N Cid, M Danger, B Freitas Terra, A Dehedin, AM De Girolamo, R Campo, V Díaz‐Villanueva, CP Duerdoth, F Dyer, E Faye, C Febria, R Figueroa, B Four, S Gafny, R Gómez, L Gómez‐Gener, MAS Graça, Simone GuareschiSimone Guareschi, B Gücker, F Hoppeler, JL Hwan, S Kubheka, A Laini, SD Langhans, C Leigh, CJ Little, S Lorenz, J Marshall, EJ Martín, A McIntosh, EI Meyer, M Miliša, MC Mlambo, M Moleón, M Morais, P Negus, D Niyogi, A Papatheodoulou, I Pardo, P Pařil, V Pešić, C Piscart, M Polášek, P Rodríguez‐Lozano, RJ Rolls, MM Sánchez‐Montoya, A Savić, O Shumilova, A Steward, A Taleb, A Uzan, R Vander Vorste, N Waltham, C Woelfle‐Erskine, D Zak, C Zarfl, A Zoppini
Intermittent rivers and ephemeral streams (IRES) may represent over half the global stream network, but their contribution to respiration and carbon dioxide (CO2) emissions is largely undetermined. In particular, little is known about the variability and drivers of respiration in IRES sediments upon rewetting, which could result in large pulses of CO2. We present a global study examining sediments from 200 dry IRES reaches spanning multiple biomes. Results from standardized assays show that mean respiration increased 32‐fold to 66‐fold upon sediment rewetting. Structural equation modeling indicates that this response was driven by sediment texture and organic matter quantity and quality, which, in turn, were influenced by climate, land use, and riparian plant cover. Our estimates suggest that respiration pulses resulting from rewetting of IRES sediments could contribute significantly to annual CO2 emissions from the global stream network, with a single respiration pulse potentially increasing emission by 0.2–0.7%. As the spatial and temporal extent of IRES increases globally, our results highlight the importance of recognizing the influence of wetting‐drying cycles on respiration and CO2 emissions in stream networks.

Funding

EU. Grant Number: 748625

EU. Grant Numbers: LIFE13 ENV/ES/000341, 603629

Spanish Ministry of Science, Innovation and Universities. Grant Numbers: CGL2017‐86788‐C3‐3‐P, CGL2017‐86788‐C3‐2‐P

Swiss National Science Foundation. Grant Numbers: PP00P3_179089, PP00P3_150698

INTER‐COST. Grant Number: LTC17017

EU / LIFE Programme

Basque Government. Grant Number: IT‐951‐16

COST (European Cooperation in Science and Technology). Grant Number: CA15113

History

School

  • Social Sciences

Department

  • Geography and Environment

Published in

Global Biogeochemical Cycles

Volume

33

Issue

10

Pages

1251 - 1263

Publisher

American Geophysical Union (AGU)

Version

  • VoR (Version of Record)

Rights holder

© American Geophysical Union

Publisher statement

This paper was published in the journal Global Biogeochemical Cycles and is available at https://doi.org/10.1029/2019gb006276.

Acceptance date

2019-08-21

Publication date

2019-09-10

Copyright date

2019

ISSN

0886-6236

eISSN

1944-9224

Language

  • en

Depositor

Dr Simone Guareschi. Deposit date: 1 November 2019