| Full text | |
| Author(s): |
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
|
| Affiliation: | [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 |
| Abstract | |
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 |