| Texto completo | |
| Autor(es): |
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]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [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
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PLANT AND SOIL; v. 456, n. 1-2, p. 391-404, NOV 2020. |
| Citações Web of Science: | 0 |
| Resumo | |
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) | |
| Processo FAPESP: | 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 |
| Beneficiário: | Carlos Alberto Martinez y Huaman |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático |
| Processo FAPESP: | 14/00317-7 - Fluxo de carbono e de gases estufa em ecossistema de pastagem composta por Panicum maximum Jacq. e Stylosanthes capitata Voegel cultivadas sob elevada concentração de CO2 e elevada temperatura em sistemas FACE/T-FACE |
| Beneficiário: | Eduardo Augusto Dias de Oliveira |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |