N2O emissions and global warming potential as affected by water management and rice cultivar on an Alfisol in Arkansas, USA

2018 ◽  
Vol 14 ◽  
pp. e00170
Author(s):  
Casey Rector ◽  
Kristofor R. Brye ◽  
Joshua Humphreys ◽  
Richard J. Norman ◽  
Edward E. Gbur ◽  
...  
Keyword(s):  
Water Management ◽  
Global Warming ◽  
Global Warming Potential ◽  
Rice Cultivar ◽  
N2o Emissions

scholarly journals Predicting the global warming potential of agro-ecosystems

2007 ◽  
Vol 4 (2) ◽  
pp. 1059-1092 ◽  
Author(s):  
S. Lehuger ◽  
B. Gabrielle ◽  
E. Larmanou ◽  
P. Laville ◽  
P. Cellier ◽  
...  
Keyword(s):  
Global Warming ◽  
Global Warming Potential ◽  
Cropping Systems ◽  
C Sequestration ◽  
N2o Emissions ◽  
Data Sets ◽  
Management Scenarios ◽  
Global Warming Impact ◽  
Sequestration Potential ◽  
The Impact

Abstract. Nitrous oxide, carbon dioxide and methane are the main biogenic greenhouse gases (GHG) contributing to the global warming potential (GWP) of agro-ecosystems. Evaluating the impact of agriculture on climate thus requires a capacity to predict the net exchanges of these gases in an integrated manner, as related to environmental conditions and crop management. Here, we used two year-round data sets from two intensively-monitored cropping systems in northern France to test the ability of the biophysical crop model CERES-EGC to simulate GHG exchanges at the plot-scale. The experiments involved maize and rapeseed crops on a loam and rendzina soils, respectively. The model was subsequently extrapolated to predict CO2 and N2O fluxes over an entire crop rotation. Indirect emissions (IE) arising from the production of agricultural inputs and from cropping operations were also added to the final GWP. One experimental site (involving a wheat-maize-barley rotation on a loamy soil) was a net source of GHG with a GWP of 350 kg CO2-C eq ha−1 yr−1, of which 75% were due to IE and 25% to direct N2O emissions. The other site (involving an oilseed rape-wheat-barley rotation on a rendzina) was a net sink of GHG for –250 kg CO2-C eq ha−1 yr−1, mainly due to a higher predicted C sequestration potential and C return from crops. Such modelling approach makes it possible to test various agronomic management scenarios, in order to design productive agro-ecosystems with low global warming impact.

scholarly journals Characterizing Greenhouse Gas Emissions and Global Warming Potential of Wheat-Maize Cropping Systems in Response to Organic Amendments in Eutric Regosols, China

Atmosphere ◽  
2020 ◽  
Vol 11 (6) ◽  
pp. 614
Author(s):  
Hamidou Bah ◽  
Xiao Ren ◽  
Yanqiang Wang ◽  
Jialiang Tang ◽  
Bo Zhu
Keyword(s):  
Global Warming ◽  
Greenhouse Gas ◽  
Global Warming Potential ◽  
Cropping Systems ◽  
Inorganic Nitrogen ◽  
Ghg Emissions ◽  
Organic Amendments ◽  
Mineral Fertilizers ◽  
N2o Emissions ◽  
Pig Slurry

Characterizing greenhouse gas (GHG) emissions and global warming potential (GWP) has become a key step in the estimation of atmospheric GHG concentrations and their potential mitigation by cropland management. However, the impacts of organic amendments on GHG, GWP, and yield-scaled GWP on cropland have not been well documented. Here, we investigate four amendment treatments (no amendment, mineral fertilizers, and pig slurry or crop residue combined with mineral fertilizers) during a two-year field experiment in rain-fed wheat-maize cropping systems. The results show that the average annual cumulative methane (CH4) flux ranged from −2.60 to −2.97 kg·C·ha−1 while nitrous oxide (N2O) flux ranged from 0.44 to 4.58 kg·N·ha−1 across all four treatments. N2O emissions were significantly correlated with soil inorganic nitrogen (i.e., NH4+-N and NO3−-N), and soil dissolved organic carbon (DOC) during both the winter wheat and summer maize seasons. On average, organic amendments combined with mineral fertilizers increased the annual GWP by 26–74% and yield-scaled GWP by 19–71% compared to those under only mineral fertilizers application. This study indicates that the fertilization strategy for Eutric Regosols can shift from only mineral fertilizers to organic amendments combined with mineral fertilizers, which can help mitigate GHG emissions and GWP while maintaining crop yields.

Yield-scaled global warming potential from N2O emissions and CH4 oxidation for almond (Prunus dulcis) irrigated with nitrogen fertilizers on arid land

2012 ◽  
Vol 155 ◽  
pp. 7-15 ◽  
Author(s):  
Daniel L. Schellenberg ◽  
Maria M. Alsina ◽  
Saiful Muhammad ◽  
Christine M. Stockert ◽  
Michael W. Wolff ◽  
...  
Keyword(s):  
Global Warming ◽  
Global Warming Potential ◽  
Prunus Dulcis ◽  
Arid Land ◽  
Nitrogen Fertilizers ◽  
N2o Emissions ◽  
Ch4 Oxidation

Water management to mitigate the global warming potential of rice systems: A global meta-analysis

2019 ◽  
Vol 234 ◽  
pp. 47-54 ◽  
Author(s):  
Yu Jiang ◽  
Daniela Carrijo ◽  
Shan Huang ◽  
Ji Chen ◽  
Nimlesh Balaine ◽  
...  
Keyword(s):  
Water Management ◽  
Global Warming ◽  
Global Warming Potential ◽  
Meta Analysis

scholarly journals Earthworm impact on the global warming potential of a no-tillage arable soil

2015 ◽  
Vol 12 (8) ◽  
pp. 6325-6359
Author(s):  
M. Nieminen ◽  
T. Hurme ◽  
J. Mikola ◽  
K. Regina ◽  
V. Nuutinen
Keyword(s):  
Global Warming ◽  
Co2 Emissions ◽  
Global Warming Potential ◽  
Field Measurements ◽  
N2o Emission ◽  
N2o Emissions ◽  
Consistent Difference ◽  
No Tillage ◽  
Climatic Effects ◽  
No Till

Abstract. We studied the effect of the deep-burrowing earthworm Lumbricus terrestris on the greenhouse gas (GHG) fluxes and global warming potential (GWP) of arable no-till soil using both field measurements and a controlled 15 week laboratory experiment. In the field, the emissions of nitrous oxide (N2O) and carbon dioxide (CO2) were on average 43 and 32% higher in areas occupied by L. terrestris (the presence judged by the surface midden) than in adjacent, unoccupied areas (with no midden). The fluxes of methane (CH4) were variable and had no consistent difference between the midden and non-midden areas. Removing the midden did not affect soil N2O and CO2 emissions. The laboratory results were consistent with the field observations in that the emissions of N2O and CO2 were on average 27 and 13% higher in mesocosms with than without L. terrestris. Higher emissions of N2O were most likely due to the higher content of mineral nitrogen and soil moisture under the middens, whereas L. terrestris respiration fully explained the observed increase in CO2 emissions. The activity of L. terrestris increased the GWP of field and laboratory soil by 50 and 18%, but only 6 and 2% of this increase was due to the enhanced N2O emission. Our results suggest that high N2O emissions commonly observed in no-tillage soils can partly be explained by the abundance of L. terrestris under no-till management and that L. terrestris can markedly regulate the climatic effects of different cultivation practises.

scholarly journals Variation in Soil Properties Regulate Greenhouse Gas Fluxes and Global Warming Potential in Three Land Use Types on Tropical Peat

Atmosphere ◽  
2018 ◽  
Vol 9 (12) ◽  
pp. 465 ◽  
Author(s):  
Kiwamu Ishikura ◽  
Untung Darung ◽  
Takashi Inoue ◽  
Ryusuke Hatano
Keyword(s):  
Global Warming ◽  
Soil Moisture ◽  
Groundwater Level ◽  
Global Warming Potential ◽  
C:N Ratio ◽  
Co2 Flux ◽  
Nitrate Content ◽  
N2o Flux ◽  
Ch4 Flux ◽  
In The Beginning

This study investigated spatial factors controlling CO2, CH4, and N2O fluxes and compared global warming potential (GWP) among undrained forest (UDF), drained forest (DF), and drained burned land (DBL) on tropical peatland in Central Kalimantan, Indonesia. Sampling was performed once within two weeks in the beginning of dry season. CO2 flux was significantly promoted by lowering soil moisture and pH. The result suggests that oxidative peat decomposition was enhanced in drier position, and the decomposition acidify the peat soils. CH4 flux was significantly promoted by a rise in groundwater level, suggesting that methanogenesis was enhanced under anaerobic condition. N2O flux was promoted by increasing soil nitrate content in DF, suggesting that denitrification was promoted by substrate availability. On the other hand, N2O flux was promoted by lower soil C:N ratio and higher soil pH in DBL and UDF. CO2 flux was the highest in DF (241 mg C m−2 h−1) and was the lowest in DBL (94 mg C m−2 h−1), whereas CH4 flux was the highest in DBL (0.91 mg C m−2 h−1) and was the lowest in DF (0.01 mg C m−2 h−1), respectively. N2O flux was not significantly different among land uses. CO2 flux relatively contributed to 91–100% of GWP. In conclusion, it is necessary to decrease CO2 flux to mitigate GWP through a rise in groundwater level and soil moisture in the region.

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