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Doctoral Thesis
Full name
Dinival Martins
Knowledge Area
Date of Defense
Piracicaba, 1987
Title in Portuguese
Influência do CO2 proveniente da decomposição de material vegetal incorporado ao solo nas razões isotópicas 13C/12C e desenvolvimento das plantas
Keywords in Portuguese
Abstract in Portuguese
O experimento, desenvolvido na primeira fase em casa de vegetação, e numa segunda fase em condições de campo, teve como objetivo a determinação dos efeitos do material vegetal incorporado ao solo, no microclima de crescimento das plantas. Foram utilizados rejeitos de cultura de plantas C-3, com δ13C = -27,6°/oo, incorporados ao solo, que alterou a composição isotópica do CO2 do ar do solo e das camadas de ar atmosférico adjacentes à superfície. A composição isotópica do CO2 no ar do solo mostrou que aproximadamente 79% do carbono foi proveniente do material orgânico vegetal nele incorporado e no ar atmosférico adjacente à superfície foi de 50% a 3% nas camadas de 0 a 30 cm de altura respectivamente. Foram determinadas as razões isotópicas 13C/12C das plantas cultivadas em solo com material orgânico incorporado, verificando-se que o CO2 evoluído do solo, foi absorvido pelas plantas através da fotossíntese durante o crescimento. A contribuição do CO2, proveniente do material orgânico na composição isotópica das plantas C-4, variou de 33% a 13% durante o crescimento das mesmas. As plantas cultivadas em solo com o material incorporado desenvolveram-se mais que as cultivadas em solo natural, com uma produtividade média 50% maior que as plantas controle.
Title in English
The influence of CO2 proceeding from plant residue decomposition in the soil on isotopics ratios 13C/12C and plant development
Abstract in English
To determine the effect of plant incorporated in the soil on the microclimate of plant growth, an experiment was carried out in greenhouse and then under field conditions. Plant residue of C-3 crops δ13C = -27.6°/oo, was incorporated in the soil. This altered the isotopic composition of the CO2 in soil air and in atmospheric air of soil layers adjacent to the surface. The soil air CO2 isotopic composition showed that approximately 79% carbon was from the incorporated organic matter and 50% to 3% in 0 to 30 cm layers, respectively, in the atmospheric air adjacent to the surface. The isotopic ratio 13C/12C of plants cultivated in soil with incorporated organic matter was determined and it was noted that the involved CO2 was photosynthetically absorved by the plants during growth. CO2 contribution from organic matter to the isotopic composition of C-4 plants varied from 33% to 13% during growth. Plants cultivated in soil with organic matter had a better development than those cultivated in natural soil. Productivity was on average 50% greater than the control plants.
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