02814nam a2200325 a 450000100080000000500110000800800410001910000170006024501050007726002010018252017940038365000190217765000180219665000160221465000090223065000100223965000140224965000210226365000190228465000240230365000100232765000230233765300180236065300220237865300190240070000170241970000140243670000170245070000210246720650702020-10-19       2016    bl uuuu     u00u1 u    #d1 aRAMOS, N. P.  aCarbon dioxide enrichment effects on the decomposition of sugarcane residues.h[electronic resource]  aIn: INTERNATIONAL SOCIETY OF SUGAR CANE TECHNOLOGISTS CONGRESS, 29., 2016, Chiang Mai, Thailand. Proceedings... Chiang Mai: International Society of Sugar Cane Technologists, v. 29, p. 28-33c2016  aAbstract: The aim of this study was to determine the decomposition dynamics of sugarcane residue under conditions of enriched atmospheric CO2 concentration using a FACE facility (Free-Air Carbon Dioxide Enrichment). The experiment, conducted in Jaguariúna, São Paulo State, Brazil, using the ClimapestFACE facility, received two treatments: elevated CO2 (550±100 ?mol mol-1) and ambient CO2 (400 ?mol mol-1), for a single amount (5 t ha-1) of straw (cane trash), in a randomized-block design with six replications. Decomposition was determined by using litter bags with sampling at 0, 14, 36, 60, 90, 119, 179, 291 and 362 days after commencement and determining the remaining biomass (kg ha-1), decomposition rate (%), constant k(kg.day-1) and half-life (t½) of decomposition (calculated by first-order exponential model). Results showed significant statistical interaction among treatments, mainly from 90 to 179 days after the beginning of the experiment when the region had high precipitation and, coincidently, the highest straw decomposition rate (4%) at the ambient CO2 concentration (400 ?mol mol-1). After that, there were no statistical differences. Small differences between treatments were not significant to affect the overall behavior of the decomposition dynamic, which followed an exponential behavior, with the same k(0.002929 kg days-1) for both treatments. Decomposition ratio was high (33%) during the first 36 days, but t½ was 237 days. Final decomposition was 69% with 1.5 t ha-1 of remaining biomass. We concluded that the increase of atmospheric CO2 concentration (from 400 to 550±100 ?mol mol-1) does not change the dynamic of sugarcane residue decomposition, which is exponential and has its highest biomass loss in the first 36 days after field deposition.  aclimate change  aCrop residues  aDegradation  aface  aStraw  aSugarcane  aCana de açúcar  aDecomposição  aDióxido de carbono  aPalha  aResíduo orgânico  aDecomposition  aSugarcane residue  aSustainability1 aVIDAL, T. A.1 aRAMOS, R.1 aROSSETTO, R.1 aNECHET, K. de L.