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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.)

Plant diurnal cycle drives the variation in soil respiration in a C-4-dominated tropical managed grassland exposed to high CO2 and warming

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Dias de Oliveira, Eduardo Augusto [1] ; Manchon, Fernanda Tomita [2] ; Ricketts, Michael P. [1] ; Bianconi, Matheus [3] ; Martinez, Carlos Alberto [2] ; Gonzalez-Meler, Miquel A. [1]
Total Authors: 6
[1] Univ Illinois, Dept Biol Sci, Ecol & Evolut, Chicago, IL 60680 - USA
[2] Univ Sao Paulo, Dept Biol Sci, Ribeirao Preto, SP - Brazil
[3] Univ Sheffield, Dept Anim & Plant Sci, Sheffield, S Yorkshire - England
Total Affiliations: 3
Document type: Journal article
Source: PLANT AND SOIL; v. 456, n. 1-2, p. 391-404, NOV 2020.
Web of Science Citations: 0

Aims To identify factors driving soil respiration (R-soil) in a tropical C-4-dominated perennial managed grassland ecosystem exposed to elevated carbon (C) dioxide concentration ({[}CO2]) and temperature. Methods The perennial grassPanicum maximumwas grown at 600 mu mol CO2 mol(-1)and + 2 degrees C above ambient temperatures for one full growing cycle (from grazing to regrowth for about similar to 30-45 days) using a free-air CO2 and infrared warming system. Plant growth and CO(2)fluxes were measured during the growing cycle. Results Both high {[}CO2] and warming increased canopy photosynthesis but warming alone increased biomass by 53% and R-soil by 26%. There was a strong diel effect on R-soil, which was 16% greater at noon than at 18:00 h. R-soil had low sensitivity to soil temperature (Q(10) similar to 1) regardless of the CO2 treatment. Conclusions In this tropical managed pasture, diel variation in photosynthesis strongly affected R-soil, suggesting that R-soil may be more limited by substrate availability than abiotic factors such as temperature. Predicted changes in climate for the region will likely affect the C dynamics of C-4-dominated tropical pastures. Although, the short-term experiment may limit the extrapolations of our findings, the highly controlled settings of the experiment highlighted the role of canopy photosynthesis on R-soil respiration in tropical C-4-pastures. (AU)

FAPESP's process: 08/58075-8 - Miniface climate-change impact experiment to analyze the effects of elevated CO2 and warming on photosynthesis, gene expression, biochemistry, growth, nutrient dynamics and yield of two contrasting tropical forage species
Grantee:Carlos Alberto Martinez y Huaman
Support Opportunities: Research Program on Global Climate Change - Thematic Grants
FAPESP's process: 14/00317-7 - Flux of carbon and greenhouse gases in a pasture ecosystem constituted by Panicum maximum Jacq. and Stylosanthes capitata Voegel cultivated under elevated CO2 and warming in a FACE/T-FACE system
Grantee:Eduardo Augusto Dias de Oliveira
Support Opportunities: Scholarships in Brazil - Post-Doctorate