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

Campanha, M. M.; Oliveira, Alexsandra Duarte de; Marriel, I. E.; Neto, M. M. Gontijo; Malaquias, Juaci Vitória; Landau, Elena Charlotte; Filho, Manoel Ricardo de Albuquerque; Ribeiro, Fabiana Piontekowski; Carvalho, Arminda Moreira de

doi:10.1016/j.scitotenv.2019.07.315

Cited by 23 publications

(21 citation statements)

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“…Seasonal and annual cumulative N 2 O fluxes were calculated by linear interpolation of the daily fluxes between the gas sampling dates [25]. Yield-scaled N 2 O emissions (kg N Mg −1 grain) were calculated using annual cumulative N 2 O emissions (kg N ha −1 ) divided by the mean grain yield (Mg grain ha −1 ) [10].…”

Section: Measurements Of N 2 O Emissionsmentioning

confidence: 99%

“…In the newly converted croplands, the lower crop yields mean a lower uptake of available N by plant, leaving more available N for nitrification and denitrification processes, which promoted the production of N 2 O. After long-term cultivation, the capacity of plant N uptake was enhanced, inducing a relative lower ratio of available N for N 2 O production [10,40]. Furthermore, after long-term cultivation in the present study, the increase extent of crop yield was 64% and 66% compared to the new croplands, which were significantly higher than the increase extent of N 2 O emissions (−21% and 37%), inducing significant decreases of the yield-scaled N 2 O emissions.…”

Section: Effects Of Land Use Conversion On Soil N 2 O Emissions and Ymentioning

confidence: 99%

“…To guarantee a secure food supply for global human population growth, agriculture intensification might cause more N 2 O emission increases in the future [4,5]. Soil N 2 O is mainly produced by microbial nitrification and denitrification [6,7], and strongly affected by substrate availability (e.g., NH 4 + and NO 3 − concentrations) and environmental conditions (e.g., temperature and moisture) [6,[8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…Tillage and fertilization are the most important management practices after the conversion of forestland to cropland; they significantly affect soil properties as well as soil carbon (C) and nitrogen (N) availability and ultimately regulate the production and emission of N 2 O [9][10][11]19,20]. However, tillage and fertilization have different driving mechanisms that affect N 2 O emissions.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Chen et al reported that forest conversion to tea fields significantly triggered substantial N 2 O emissions in the first year due to a high basal fertilizer input and intense tillage [11]. Previous studies have made great progress in explaining how tillage and fertilization practices drive N 2 O emissions in agricultural lands [10,19,24,26]. More studies are still needed to quantify the relative contributions of tillage and fertilization to increased N 2 O emissions when specifically converting forestland to cropland, which would be helpful for developing suggestions on how to reduce N 2 O emissions in the transformed croplands.…”

Section: Introductionmentioning

confidence: 99%

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How Tillage and Fertilization Influence Soil N2O Emissions after Forestland Conversion to Cropland

et al. 2020

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Soil nitrous oxide (N2O) emissions are influenced by land use adjustment and management practices. To meet the increasing socioeconomic development and sustainable demands for food supply, forestland conversion to cropland occurs around the world. However, the effects of forestland conversion to cropland as well as of tillage and fertilization practices on soil N2O emissions are still not well understood, especially in subtropical regions. Therefore, field experiments were carried out to continuously monitor soil N2O emissions after the conversion of forestland to cropland in a subtropical region in Southwest China. One forestland site and four cropland sites were selected: forestland (CK), short-term croplands (tillage with and without fertilization, NC-TF and NC-T), and long-term croplands (tillage with and without fertilization, LC-TF and LC-T). The annual cumulative N2O flux was 0.21 kg N ha−1 yr−1 in forestland. After forestland conversion to cropland, the annual cumulative N2O flux significantly increased by 76‒491%. In the short-term and long-term croplands, tillage with fertilization induced cumulative soil N2O emissions that were 94% and 235% higher than those from tillage without fertilization. Fertilization contributed 63% and 84% to increased N2O emissions in the short-term and long-term croplands, respectively. A stepwise regression analysis showed that soil N2O emissions from croplands were mainly influenced by soil NO3− and NH4+ availability and WFPS (water-filled pore space). Fertilization led to higher soil NH4+ and NO3− concentrations, which thus resulted in larger N2O fluxes. Thus, to reduce soil N2O emissions and promote the sustainable development of the eco-environment, we recommend limiting the conversion of forestland to cropland, and meanwhile intensifying the shift from grain to green or applying advanced agricultural management practices as much as possible.

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Section: Measurements Of N 2 O Emissionsmentioning

confidence: 99%

Section: Effects Of Land Use Conversion On Soil N 2 O Emissions and Ymentioning

confidence: 99%