Sediment Respiration Pulses in Intermittent Rivers and Ephemeral Streams

2019-10

von Schiller, D

Datry, T

Corti, R

Foulquier, A

Tockner, K

Marcé, R

García-Baquero, G

Odriozola, I

Obrador, B

Elosegi, A

Mendoza-Lera, C

Gessner, M O

Stubbington, R

Albariño, R

Allen, D C

Altermatt, F

Arce, M I

Arnon, S

Banas, D

Banegas-Medina, A

Beller, E

Blanchette, M L

Blanco-Libreros, J F

Blessing, J

Boëchat, I G

Boersma, K S

Bogan, M T

Bonada, N

Bond, N R

Brintrup, K

Bruder, A

Burrows, R M

Cancellario, T

Carlson, S M

Cauvy-Fraunié, S

Cid, N

Danger, M

de Freitas Terra, B

Dehedin, A

De Girolamo, A M

del Campo, R

Díaz-Villanueva, V

Duerdoth, C P

Dyer, F

Faye, E

Febria, C

Figueroa, R

Four, B

Gafny, S

Gómez, R

Gómez-Gener, L

Graça, M A S

Guareschi, S

Gücker, B

Hoppeler, F

Hwan, J L

Kubheka, S

Laini, A

Langhans, S D

Leigh, C

Little, C J

Lorenz, S

Marshall, J

Martín, E J

McIntosh, A

Meyer, E I

Miliša, M

Mlambo, M C

Moleón, M

Morais, M

Negus, P

Niyogi, D

Papatheodoulou, A

Pardo, I

Pařil, P

Pešić, V

Piscart, C

Polášek, M

Rodríguez-Lozano, P

Rolls, R J

Sánchez-Montoya, M M

Savić, A

Shumilova, O

Steward, A

Taleb, A

Uzan, A

Vander Vorste, R

Waltham, N

Woelfle-Erskine, C

Zak, D

Zarfl, C

Zoppini, A

Journal Article

en

Publication

Wiley-Blackwell Publishing, Inc

United States of America

10.1029/2019GB006276

une:1959.11/53237

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.

link

Global Biogeochemical Cycles, 33(10), p. 1251-1263

1944-9224

0886-6236

1251

1263