umu.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Simulating rewetting events in intermittent rivers and ephemeral streams: A global analysis of leached nutrients and organic matter
Show others and affiliations
2019 (English)In: Global Change Biology, ISSN 1354-1013, E-ISSN 1365-2486, Vol. 25, no 5, p. 1591-1611Article in journal (Refereed) Published
Abstract [en]

Climate change and human pressures are changing the global distribution and the extent of intermittent rivers and ephemeral streams (IRES), which comprise half of the global river network area. IRES are characterized by periods of flow cessation, during which channel substrates accumulate and undergo physico-chemical changes (preconditioning), and periods of flow resumption, when these substrates are rewetted and release pulses of dissolved nutrients and organic matter (OM). However, there are no estimates of the amounts and quality of leached substances, nor is there information on the underlying environmental constraints operating at the global scale. We experimentally simulated, under standard laboratory conditions, rewetting of leaves, riverbed sediments, and epilithic biofilms collected during the dry phase across 205 IRES from five major climate zones. We determined the amounts and qualitative characteristics of the leached nutrients and OM, and estimated their areal fluxes from riverbeds. In addition, we evaluated the variance in leachate characteristics in relation to selected environmental variables and substrate characteristics. We found that sediments, due to their large quantities within riverbeds, contribute most to the overall flux of dissolved substances during rewetting events (56%-98%), and that flux rates distinctly differ among climate zones. Dissolved organic carbon, phenolics, and nitrate contributed most to the areal fluxes. The largest amounts of leached substances were found in the continental climate zone, coinciding with the lowest potential bioavailability of the leached OM. The opposite pattern was found in the arid zone. Environmental variables expected to be modified under climate change (i.e. potential evapotranspiration, aridity, dry period duration, land use) were correlated with the amount of leached substances, with the strongest relationship found for sediments. These results show that the role of IRES should be accounted for in global biogeochemical cycles, especially because prevalence of IRES will increase due to increasing severity of drying events.

Place, publisher, year, edition, pages
WILEY , 2019. Vol. 25, no 5, p. 1591-1611
Keywords [en]
biofilms, leaching, leaf litter, rewetting, sediments, temporary rivers
National Category
Climate Research
Identifiers
URN: urn:nbn:se:umu:diva-158943DOI: 10.1111/gcb.14537ISI: 000465103600004PubMedID: 30628191OAI: oai:DiVA.org:umu-158943DiVA, id: diva2:1318440
Available from: 2019-05-27 Created: 2019-05-27 Last updated: 2019-05-27Bibliographically approved

Open Access in DiVA

fulltext(1967 kB)41 downloads
File information
File name FULLTEXT01.pdfFile size 1967 kBChecksum SHA-512
924f044444b66389ed808e5d82ff06c3971fe03ca01cc09f012f8ca522d4310927c95d10d77a66208eb2930c05fc92ec10989da2b434001c7b1a74802e1b96df
Type fulltextMimetype application/pdf

Other links

Publisher's full textPubMed

Authority records BETA

Gómez-Gener, Lluís

Search in DiVA

By author/editor
Zak, DominikDatry, Thibaultvon Schiller, DanielFoulquier, ArnaudObrador, BielTockner, KlementAltermatt, FlorianGómez-Gener, LluísLeigh, CatherineLorenz, StefanNegus, PeterRolls, Robert J.
By organisation
Department of Ecology and Environmental Sciences
In the same journal
Global Change Biology
Climate Research

Search outside of DiVA

GoogleGoogle Scholar
Total: 41 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
pubmed
urn-nbn

Altmetric score

doi
pubmed
urn-nbn
Total: 55 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf