Variabilidade espaço temporal do efluxo de CO2 do solo associado a fatores abióticos em cultivo de híbridos

Abstract

The palmicultura or palm culture cultivates the species oleaginous popularly known for palm oil. Knowing the environmental effects of this culture mainly through the trials analyzed interspecific hybrids (Elaeis guineensis x Elaeis oleifera) is of paramount importance, since they are the ones planted by the Pro Dendê in an area of high incidence of AF in Brazil. The overall objective is to evaluate the spatial and temporal variability of the stock of roots and soil CO2 efflux in interspecific hybrid cultivation of oil palm (Elaeis guineensis x Elaeis oleifera) in the eastern Amazon. The field surveys were conducted on property belonging to the company Marborges Agroindústria S.A., located in Bacuriteua village in the municipality of Moju - Pará. In the area four plots were selected with a total of 32 points spread across basic sites called, third, middle sheet, and stacking carrier. The determination of the stock of roots was made by auger technique in depth range of 0-10 cm in January, April, July and October, being washed, separated, dried and weighed to the dry weight in the laboratory. For soil CO2 efflux used an infrared gas analyzer LI-COR 6400-09 coupled to a dynamic camera, and a thermometer were measured in which the soil temperature. There data for obtaining gravimetric moisture, carbon and nitrogen in the soil. In the results related to the root biomass was reduced in percentage with increasing diameter class, for the frequencies of distributions root biomass, none of the classes study differed statistically or for the period, and not to the sampling site, so for this study no definitive conclusions can be made about how much influence the spatial variability in the stock of roots. The results presented show that there was no significant difference in the concentration of soil organic carbon and nitrogen or in between the collection sites. Statistical analysis confirmed that there was no satisfactory answer to the correlation between the CO2 efflux and temperature, only a correlation between the efflux of CO2 and humidity.