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Severo,Fabiane Figueiredo; Aita,Natália Tobin; Marques,Laila Garcia; Silva,Leandro Souza da. |
ABSTRACT: It has become possible to evaluate the conversion of soil organic matter (SOM) in pastures and arboreal crops due to the difference between the photosynthetic cycles of Eucalyptus (C3) and most grasses (C4). The auto analyzer method coupled to the IRMS (Isotope Ratio Mass Spectrometer) in the present study evaluated the 13C content in soil profiles of Eucalyptus plantations of different ages (2, 10 and 21 years), in natural regeneration areas and natural grazing fields, and estimated the SOM conversion of each crop type of. The initial management of all sampled areas was natural pasture. The following profile layers were evaluated: 0-5, 5-10, 10-20, 20-30, 30-40, 40-50, 50-70 and 70-90cm, and the contribution of Eucalyptus biomass over the years... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cycle C3; Cycle C4; Eucalyptus grandis. |
Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000400251 |
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Moscôso,Janielly Silva Costa; Silva,Leandro Souza da; Tarouco,Camila Peligrinotti; Nicoloso,Fernando Teixeira; Severo,Fabiane Figueiredo; Aita,Natália Tobin; Prigol,Luís Henrique Ferreira. |
ABSTRACT: Rhizospheric carbon resulting from root exudation is one of the substrates used by the soil microbiota, and reflects methane (CH4) emissions in anoxic environments such as irrigated rice cultivation. With the increase of the photosynthetic capacity of the plant in the reproductive period, there is greater accumulation of biomass which, in turn, increases the rate of root exudation. However, genotypic variations in the physiological aspects of rice plants may be related to the amount of root exudates. Ten cultivars of irrigated rice were evaluated for the exudation rate of total organic carbon (EXRToc), shoot dry matter (SDM), and physiological variables related to photosynthesis during the full flowering (blooming) period. Two experiments were... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Photosynthesis; Exudates; Methanogenesis. |
Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018001200250 |
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