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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The root of the problem: Direct influence of riparian vegetation on estimation of stream ecosystem metabolic rates

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Dodds, Walter K. [1] ; Tromboni, Flavia [2] ; Saltarelli, Wesley Aparecido [3] ; Fernandes Cunha, Davi Gasparini [3]
Total Authors: 4
[1] Kansas State Univ, Manhattan, KS 66506 - USA
[2] Univ Estado Rio de Janeiro, Dept Ecol, IBRAG, Rio De Janeiro - Brazil
[3] Univ Sao Paulo, Escola Engn Sao Carlos, Dept Hidraul & Saneamento, Sao Paulo - Brazil
Total Affiliations: 3
Document type: Journal article
Source: LIMNOLOGY AND OCEANOGRAPHY LETTERS; v. 2, n. 1, p. 9-17, FEB 2017.
Web of Science Citations: 7

Abundant living roots can be found in some streams and other shallow marine and freshwater habitats. A reach of a small Brazilian forested stream had 28% cover by live roots and exhibited diurnal trends in dissolved oxygen that could be attributed to gross primary production, but we hypothesized that activity of riparian tree roots in the channel caused this pattern. During sunny periods, trees transpire deoxygenated water from roots to the canopy but not in the dark, resulting in diurnal cycles of dissolved oxygen. Whole-stream shading experiments showed that photosynthesis in the stream is not responsible for the pattern. Sealed chamber measurements showed living roots of riparian vegetation had substantial respiratory activity and ammonium and nitrate uptake, and rates per unit area were greater than sand and less than silt (the other two dominant substrata), indicating roots can substantially alter in-stream biogeochemistry. (AU)

FAPESP's process: 14/02088-5 - Nitrogen biological fixation and uptake by phytoplankton in subtropical reservoirs with different trophic status
Grantee:Davi Gasparini Fernandes Cunha
Support type: Regular Research Grants