Relações entre aporte de serrapilheira, nutrientes e efluxo de dióxido de carbono em floresta inundável de Vochysia divergens Pohl no Pantanal Mato-Grossense

Abstract

Natural flooded areas are among high productivity ecosystems and are broadly distributed around the world. The Pantanal is one of the biggest wetland of the world and around 30% of its area comprises seasonal floodable forests. Considering the importance of these forest ecosystems, this research had as main purpose to analyses the dynamics of litter and CO2 soil effluxes in a seasonal flooded forest at Pantanal Mato-Grossense. This dynamic vary between seasons and transects. The litterfall leaf fraction was the most important compartment because of its spatial and temporal dynamics to the nutrients input into soil. The spatial and temporal pattern of V. divergens leaves deposition was significantly different compared to the another plants in the community, with peaks in the transitional seasons. The nutrient input in the flooded period was, in ascending order, phosphorus, potassium, nitrogen and carbon. The accumulated litterfall above soil was high at points with higher soil moisture, located in the middle region of the forest. In temporal scale, the CO2 soil efflux was higher within the 1-19,9% soil moisture range where the temperature was also higher, occurring most at flooding and rising water period. The CO2 soil efflux spatial pattern the higher values was observed at transects with V. divergens dominance, thinner water lamina above the soil and within the flooding season.