000			03458nab a2200313 i 4500
003			BR-BrBNA
005			20250324143120.0
008			250324b2020 bl.ar|pooa||| 00| 0 eng |
040			_aBR-BrBNA _beng
072			_aP33
072			_aT01
100			_aNascimento, Alexandre Ferreira do
100			_aRodrigues, Renato de Aragão Ribeiro
100			_aSilveira, Julia Graziela da
100			_aSilva, Jacqueline Jesus Nogueira da
100			_aDaniel, Vagner de Carvalho
100			_aSegatto, Eduardo Reckers
245			_aNitrous oxide emissions from a tropical Oxisol under monocultures and an integrated system in the Southern Amazon – Brazil
500			_aPublicação on-line; 40 ref.; 3 illus; Sumaries (En)
520			_a ABSTRACT: Although 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 µg 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 µg 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. Keywords: global warming, mitigation, greenhouse effect gases, Oxisols, agricultural soils, forest soils.
650			_aUSO DA TERRA
650			_aMONOCULTURA
650			_aANÁLISE DO SOLO
650			_aAQUECIMENTO GLOBAL
773	0		_0808 _9345421 _dViçosa-MG Sociedade Brasileira de Ciência do Solo 1977 _o2024-5955 _tRevista Brasileira de Ciência do Solo (Brazil) _x0100-0683 _gv. 44 p. 1-14; (2020) _wBR2024004975
856			_uhttps://www.scielo.br/j/rbcs/a/BHrnCy5wcYG7Hqq99tR7FwN/?format=pdf&lang=en
942			_cANA
999			_c330616 _d330616