Ciclagem de carbono e nitrogênio no solo sob restinga do Estado de São Paulo / Carbon and nitrogen cycling in soil under Restinga of São Paulo State

AUTOR(ES)

Diego Queiroz Alegria de Almeida

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

02/12/2011

RESUMO

The Atlantic Forest is the second largest Brazilian forest, now having only 7.6% of its original size. The remaining spots are found in Serra do Mar and Serra da Mantiqueira, in southeastern Brazil, the restinga biome is the most susceptible to degradation. The main objective of this work was to study the cycle of carbon and nitrogen in sandy soils under different types of vegetation (ante-dune, dune, scrub and restinga) of the North and South Coast of São Paulo State. Soil samples were analyzed from the following areas: Parque Estadual da Núcleo de Picinguaba, Parque Estadual da Ilha Anchieta, Juréia-Itatins, Vila de Pedrinhas in the municipalty of Ilha Comprida and Parque Estadual da Ilha do Cardoso. Five soil samples were collected (0-5, 5-10, 10-15, 15-20 cm deep) at each site. The results showed that soils under these different types of vegetation contain very low levels of carbon and nitrogen comparing to soil under other types of vegetation in the Atlantic Forest. The restinga types of vegetation (high and low) were the ones with the highest levels of carbon, especially in high restinga on the Ancheita Island, reaching values of 43.07 g.kg-1 on the surface while soil under dune vegetation had the lowest levels. The levels of nitrogen followed the same trend of carbon, with the restinga vegetation having the highest results. The organic matter in the studied soils was predominantly composed of C3 photosynthetic cycle plants, with values 13C ranging from -29.0 to -27.7. The organic matter under in the soil under dune vegetation in influenced by C4 plants having values of about -22. The 15N isotope values show that the soils have significant limitation regarding nitrogen cycle and indicate that this nutrient is extremely limited in all areas and under all types of vegetation. The spatial variability between different places and different types of vegetation had a direct influence on the levels and quantities of studied elements.

ASSUNTO(S)

restinga soils solos carbono mata atlântica nitrogen nitrogênio restinga atlantic forest carbon

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