Estudo de respiração do solo na Floresta Nacional de Caxiuanã, projeto ESECAFLOR/LBA
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2014-04Autor
http://lattes.cnpq.br/2235033265107175
OLIVEIRA, Alex Antonio Ribeiro de
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The Amazon Rainforest is about 5 million km2 of the total Brazilian territory and comprises nine states, The Caxiuanã National Forest is located in Para State and has an area of 330,000 hectares, where the research project ESECAFLOR/LBA, which artificially simulates a prolonged drought , with the aim of assessing the impacts on carbon fluxes is inserted and water cycle. It consists of two plots, one plot of call treatment, which have a physical structure for the purpose of eliminating 50% of rainwater and other call control plot that serves as a comparison of experiments performed on the plot exclusion. The balance of energy and gases are extremely important for the balance and maintenance of ecosystems and in terms of magnitude, soil respiration is a major stream in the global carbon cycle. The aim of this work was to study the monthly and seasonal behavior of soil respiration under different conditions of temperature and soil moisture. Measurements of soil respiration, temperature and soil moisture were performed simultaneously on a monthly basis during the period august 2009 to december 2011. The mean soil respiration was 4.86 ± 1.50 and 4.56 ± 1.53 μmol CO2 m-2s-1 in control plots and treatment respectively. The mean soil temperature were 26.2 ± 0.86 and 26.5 ± 0.72 ° C in the control plots and treatment, respectively , while average soil moisture were 12 ± 4.30 and 7 ± 2.15 % in the control plots and treatment, respectively. Soil respiration was slightly higher in the control plot in relation to the treatment plot although no statistically significant differences between these parcels have been found. Soil moisture showed higher mean values in the control plot in relation to the treatment plot and statistically significant differences were found between plots. The long period in which the treatment plot is subjected to artificial drought, possibly may have altered the relationship between temperature and soil moisture on soil respiration.
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