03207naa a2200373 a 450000100080000000500110000800800410001902200140006002400510007410000250012524501510015026000090030152021200031065000170243065000190244765000220246665000210248865000120250965000160252165000180253765000090255565000140256465000110257865000190258965300160260865300160262465300130264070000270265370000230268070000230270370000210272670000190274777300670276621237592020-07-09       2020    bl uuuu     u00u1 u    #d  a1806-96577 ahttps://doi.org/10.36783/18069657rbcs20192DOI1 aNASCIMENTO, A. F. do  aNitrous oxide emissions from a tropical Oxisol under monocultures and an integrated system in the Southern Amazon - Brazil.h[electronic resource]  c2020  aAlthough agriculture and livestock systems represent important sources of N2O from the soil, they may also aid in emissions mitigation, mainly when integrated systems are taken into account, such as crop-livestock-forest, for food production. This work assessed the soil N2O emissions from a tropical Oxisol under row-crop, livestock, forest monocultures, and an integrated crop-livestock-forest system in the Southern Amazon - Brazil. Soil N2O emissions were measured using static chambers from November 2014 to October 2016 in four soil use systems [row-crop, livestock, forest, and integrated crop-livestock-forest (CLF)], and in a reference area under native forest fragment. For the whole period, the average of soil N2O fluxes was 16.9, 12.2, and 15.4 ug N2O-N m-2 h-1, to row-crop, livestock, and CLF systems, respectively, all with a similar average among them. The lowest fluxes were observed in the forest system and native forest fragment, with average fluxes of 4.0 and 6.3 ug N2O-N m-2 h-1, respectively, both lower than the agricultural systems. The largest soil N2O fluxes were observed throughout the rainy seasons in the row-crop, livestock, and CLF, mostly after N-fertilizer application to the soil surface or in the planted row. As a consequence, the cumulative emissions were greater in row-crop, livestock, and CLF systems, which in the averages of two cycles emitted respectively 1.40, 1.15, and 1.27 kg N2O-N ha-1 yr-1, all different of the forest system and native forest fragment (0.33 and 0.52 kg N2O-N ha-1 yr-1, respectively). Nitrogen fertilization and soil moisture influenced soil N2O emissions of all systems assessed in the Southern Amazon. The N2O emissions took place after both factors were met, corroborating the hole-in-the-pipe model. Even with more soil use intensification, once in the same area there were three cultures in succession during a year and perennial trees, CLF did not lead to greater N2O emissions from the soil than row-crop and livestock. Thus, CLF represents a good option for N2O mitigation for the edaphic and climatic conditions of the Southern Amazon.  aForest soils  aGlobal warming  aGreenhouse effect  aGreenhouse gases  aOxisols  aAquecimento  aEfeito Estufa  aGás  aLatossolo  aOxisol  aSolo Florestal  aMato Grosso  aMitigação  aSinop-MT1 aRODRIGUES, R. de A. R.1 aSILVEIRA, J. G. da1 aSILVA, J. J. N. da1 aDANIEL, V. de C.1 aSEGATTO, E. R.  tRevista Brasileira de Ciência do Sologv. 44, e0190123, 2020.