Fluxos de óxido nitroso e suas relações com atributos físicos e químicos do solo

Corrêa, Robson Schaff; Madari, B. E.; Carvalho, Glaucilene Duarte; Costa, Adriana Rodolfo da; Pereira, Ana Cláudia de Castro; Medeiros, João Carlos

doi:10.1590/s0100-204x2016000900014

Cited by 4 publications

(1 citation statement)

References 14 publications

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“…The greater fluxes and, consequently, greater cumulative emissions in the wet season of the cycles may be related to the greater activity of microorganisms responsible for nitrification and, mainly, denitrification processes, enhanced when WFPS is more than 70 % (Van der Weerden, 2012;Butterbach-Bahl et al, 2013;Corrêa et al, 2016). When WFPS was below 50 %, which in the evaluated soils was predominant from May/June to September/October, N 2 O fluxes were low or negative, further highlighting the role of soil moisture related to N 2 O emissions.…”

Section: Discussionmentioning

confidence: 99%

Nitrous oxide emissions from a tropical Oxisol under monocultures and an integrated system in the Southern Amazon – Brazil

Nascimento¹,

Rodrigues²,

Silveira³

et al. 2020

Revista Brasileira De Ciência Do Solo

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Although agriculture and livestock systems represent important sources of N 2 O 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 N 2 O emissions from a tropical Oxisol under row-crop, livestock, forest monocultures, and an integrated crop-livestock-forest system in the Southern Amazon-Brazil. Soil N 2 O 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 N 2 O fluxes was 16.9, 12.2, and 15.4 µg N 2 ON 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 N 2 ON m-2 h-1 , respectively, both lower than the agricultural systems. The largest soil N 2 O 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 N 2 ON ha-1 yr-1 , all different of the forest system and native forest fragment (0.33 and 0.52 kg N 2 ON ha-1 yr-1 , respectively). Nitrogen fertilization and soil moisture influenced soil N 2 O emissions of all systems assessed in the Southern Amazon. The N 2 O 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 N 2 O emissions from the soil than row-crop and livestock. Thus, CLF represents a good option for N 2 O mitigation for the edaphic and climatic conditions of the Southern Amazon.

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Section: Discussionmentioning

confidence: 99%

Nitrous oxide emissions from a tropical Oxisol under monocultures and an integrated system in the Southern Amazon – Brazil

Nascimento¹,

Rodrigues²,

Silveira³

et al. 2020

Revista Brasileira De Ciência Do Solo

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Effect of soil tillage and N fertilization on N2O mitigation in maize in the Brazilian Cerrado

Campanha

Oliveira

Marriel

et al. 2019

Science of The Total Environment

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Greenhouse gas emissions and carbon sequestration associated with Integrated Crop–Livestock–Forestry (ICLF) systems

et al. 2023

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Greenhouse gas (GHG) emissions from the Agriculture, Forest, and Other Land Use (AFOLU) sector account for 23% of net global anthropogenic emissions. However, effective conservation agriculture practices can sequester carbon (C) up to one meter in soil depth and vegetation biomass. Integrated Crop-Livestock-Forestry (ICLF) systems attempt to ensure sustainable agricultural production by combining various agricultural, livestock, and forestry production systems. This bibliographic review aims to present and discuss ICLF systems, and their advantages and disadvantages compared to conventional systems, achieving a better understanding of the sources and sinks of greenhouse gasses (CH4, N2O, and CO2). Integrated systems exist in tropical and temperate climates, with different practices, arrangements, designs, and modalities. Intercropping species with different root structures provide more ecological interactions that enhance biodiversity, soil quality, and C sequestration while reducing GHG emissions. Yet, ICLF systems are complex and require technical assistance and support for being implemented, besides an extensive initial investment that increases the cost of operation. A relevant carbon sink in ICLF systems is carbon from tree biomass, where the wood can be used for various purposes. Timber for sawmills and general construction has a longer C immobilization time. Methane from enteric fermentation is the greatest contributor to GHG emissions in livestock and ICLF systems. Nitrous oxide is released primarily from synthetic fertilizers (when applied), manure deposited on pastures, and decomposition of plant residues. Carbon dioxide is emitted to a lesser extent from the application of lime and urea. Many studies do not include all compartments in the C balance and often focus on only one GHG or compartment of C. Accordingly, more studies on the sources and sinks of C and their potential to offset GHG emissions in terms of CO2 equivalent are urged.

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Fluxos de óxido nitroso e suas relações com atributos físicos e químicos do solo

Cited by 4 publications

References 14 publications

Nitrous oxide emissions from a tropical Oxisol under monocultures and an integrated system in the Southern Amazon – Brazil

Nitrous oxide emissions from a tropical Oxisol under monocultures and an integrated system in the Southern Amazon – Brazil

Effect of soil tillage and N fertilization on N2O mitigation in maize in the Brazilian Cerrado

Greenhouse gas emissions and carbon sequestration associated with Integrated Crop–Livestock–Forestry (ICLF) systems

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