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Maggiotto, Selma Regina; Universidade de Brasília; Oliveira, Dalziza de; Instituto Agronômico do Paraná; Marur, Celso Jamil; Instituto Agronômico do Paraná; Stivari, Sonia Maria Soares; Universidade Estadual de Maringá; Leclerc, Monique; University of Georgia; Wagner-Riddle, Claudia; University of Guelph. |
Rubber tree plantations may improve the soil’s physical and chemical properties, and they may sequester atmospheric carbon in the biomass or the soil. However, the potential role of these plantations in sequestering carbon in the soil and plant biomass has not been fully evaluated. This study evaluated rubber tree plantations at Paranapoema, which is located in the northwestern region of the Paraná state of Brazil, to measure the biomass in plantations of different ages and to determine the organic carbon content and d13C in the soils. Biomass accumulation was evaluated using the destructive method in plantations of different ages. The total carbon stock in the top 60 cm of the soil was 63.4 Mg C ha-1 for the pasture adjacent to the plantations and 66.8... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 5.01.05.00-0 rubber tree; Hevea brasiliensis; Soil sigma13C; Isotopic ratio; Soil carbon stocks Agrometeorologia. |
Ano: 2014 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/17404 |
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Emmery, Antoine; Lefebvre, Sebastien; Alunno-bruscia, Marianne; Kooijman, S. A. L. M.. |
We studied the dynamics of stable isotopes δ13C and δ15N of an opportunistic suspension feeder the Pacific oyster (Crassostrea gigas) to better understand the factors that influence the trophic enrichment (trophic-shift, Δ) between primary producers and consumers. Most of the previous studies on this topic do not quantify mass fluxes or isotopic discrimination phenomena in the organism, which are two pillars in isotope ecology. We used a dynamic energy budget (DEB) approach (Kooijman, 2010) to quantify i) the fluxes of elements and isotopes in C. gigas soft tissues and ii) the impact of the scaled feeding level, the organism mass and the isotopic ratio of food on the "trophic-shift" Δ, and isotope turnover in tissues. Calibration and parametrization... |
Tipo: Text |
Palavras-chave: Oyster; Isotopic ratio; Discrimination; Trophic-shift; Diet; DEB theory. |
Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00043/15434/12784.pdf |
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