2013-08-142013-08-142013-03SILVA JÚNIOR, João de Athaydes, et al. Fluxos de CO2 do solo na Floresta Nacional de Caxiuanã, Pará, durante o experimento ESECAFLOR/LBA. Revista Brasileira de Meteorologia, São Paulo, v. 28, n. 1, p. 85-92, mar. 2013. Disponível em: <http://www.scielo.br/pdf/rbmet/v28n1/09.pdf>. Acesso em: 14 ago. 2013. <http://dx.doi.org/10.1590/S0102-77862013000100009>.0102-7786https://repositorio.ufpa.br/handle/2011/4136The ESECAFLOR/LBA experiment was carried out at the Caxiuanã National Forest, Pará State, and this article intends to investigate the effect of hydrological stress on the total soil respiration. Two adjacent 1 hectare plots were defined in January 2002. One plot remained in its natural conditions and was used as a control (A), while in the exclusion plot (B) plastic cover panels were installed in order to drain about 70% of the total rainfall to outside of the plot. Accumulated monthly rainfall was recorded from 2005 January to December. During 2005 the rainfall over the ECFPn was 2,211.6 mm, or 9.96% above the mean of 2,011.2 mm. The average soil moisture was 15.6±9.2 and 9.5±3.4% in the plots A and B, respectively. The average soil temperature was 25.6±0.4 and 25.7±0.5 ºC, for the A and B plots, respectively. The average soil CO2 flux was 3.46±0.44 and 3.21±0.84 μmolCO2 m-2s-1 in the A and B plots, respectively. With the exclusion of part of rain in plot B, it had a reduction of 7.23% in the soil CO2 flux (0.25 μmolCO2 m-2s-1), 39.1% in the soil humidity (6.1p.p.), and an increase of 0.39% in the soil temperature (0.1ºC). The soil moisture in parcel B was lesser than in the parcel A, due to the exclusion system of rain. However at the beginning of the year, site B undergone some changes causing the measuring values to be about the same on both areas.porAcesso AbertoFlorestasSolosTemperatura do soloRespiração do soloUmidade do soloFloresta Nacional de Caxiuanã - PAMelgaço - PAPará - EstadoAmazônia brasileiraArtigo de Periódico