Landscape geomorphic characteristic impacts on greenhouse gas fluxes in exposed stream and riparian sediments

2016 ◽  
Vol 18 (7) ◽  
pp. 844-853 ◽  
Author(s):  
Philippe Vidon ◽  
Satish Serchan
Keyword(s):  
Greenhouse Gas ◽  
Riparian Zone ◽  
Gas Emissions ◽  
Gas Fluxes ◽  
Greenhouse Gas Fluxes ◽  
Forest Streams

In forest streams, riparian zone gas emissions exceed those of in-stream locations, with most CO2eq driven by CH4 production.

Measurement of greenhouse gas emissions from Australian feedlot beef production using open-path spectroscopy and atmospheric dispersion modelling

2008 ◽  
Vol 48 (2) ◽  
pp. 244 ◽  
Author(s):  
Zoë Loh ◽  
Deli Chen ◽  
Mei Bai ◽  
Travis Naylor ◽  
David Griffith ◽  
...  
Keyword(s):  
Greenhouse Gas ◽  
Software Package ◽  
Near Infrared ◽  
Atmospheric Dispersion ◽  
Gas Emissions ◽  
The North ◽  
Open Path ◽  
Gas Fluxes ◽  
Greenhouse Gas Fluxes ◽  
Beef Feedlots

Feedlot production of beef cattle results in concentrated sources of gas emissions to the atmosphere. Reported here are the preliminary results of a micrometeorological study using open-path concentration measurements to determine whole-of-feedlot emissions of methane (CH4) and ammonia (NH3). Tunable near-infrared diode lasers were used to measure line-averaged (150–400 m) open-path concentrations of CH4 and NH3. A backward Lagrangian stochastic model of atmospheric dispersion and the software package WindTrax were used to estimate greenhouse gas fluxes from the measured concentrations. We studied typical Australian beef feedlots in the north (Queensland) and south (Victoria) of the continent. The data from a campaign during summer show a range of CH4 emissions from 146 g/animal.day in Victoria to 166 g/animal.day in Queensland and NH3 emissions from 125 g/animal.day in Victoria to 253 g/animal.day Queensland.

scholarly journals EFFECTS OF FERTILIZATION ON POREWATER NUTRIENTS, GREENHOUSE-GAS EMISSIONS AND RICE PRODUCTIVITY IN A SUBTROPICAL PADDY FIELD

2018 ◽  
Vol 55 (3) ◽  
pp. 395-411 ◽  
Author(s):  
WEIQI WANG ◽  
JORDI SARDANS ◽  
CHUN WANG ◽  
CHUAN TONG ◽  
QINYANG JI ◽  
...  
Keyword(s):  
Global Warming ◽  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Rice Yield ◽  
Scientific Basis ◽  
Double Fertilization ◽  
Gas Emissions ◽  
Gas Fluxes ◽  
Greenhouse Gas Fluxes ◽  
Porewater Nutrients

SUMMARYSuitable fertilization is crucial for the sustainability of rice production and for the potential mitigation of global warming. The effects of fertilization on porewater nutrients and greenhouse-gas fluxes in cropland, however, remain poorly known. We studied the effects of no fertilization (control), standard fertilization and double fertilization on the concentrations of porewater nutrients, greenhouse-gas fluxes and emissions, and rice yield in a subtropical paddy in southeastern China. Double fertilization increased dissolved NH4+ in porewater. Mean CO2 and CH4 emissions were 13.5% and 7.4%, and 20.4% and 39.5% higher for the standard and double fertilizations, respectively, than the control. N2O depositions in soils were 61% and 101% higher for the standard and double fertilizations, respectively, than the control. The total global warming potentials (GWPs) for all emissions were 14.1% and 10.8% higher for the standard and double fertilizations, respectively than the control, with increasing contribution of CH4 with fertilization and a CO2 contribution > 85%. The total GWPs per unit yield were significantly higher for the standard and double fertilizations than the control by 7.3% and 10.9%, respectively. The two levels of fertilization did not significantly increase rice yield. Prior long-term fertilization in the paddy (about 20 years with annual doses of 95 kg N ha−1, 70 kg P2O5 ha−1 and 70 kg K2O ha−1) might have prevented these fertilizations from increasing the yield. However, fertilizations increased greenhouse-gas emissions. This situation is common in paddy fields in subtropical China, suggesting a saturation of soil nutrients and the necessity to review current fertilization management. These areas likely suffer from unnecessary nutrient leaching and excessive greenhouse-gas emissions. These results provide a scientific basis for continued research to identify an easy and optimal fertilization management solution.

scholarly journals Winter greenhouse gas fluxes (CO<sub>2</sub>, CH<sub>4</sub> and N<sub>2</sub>O) from a subalpine grassland

2013 ◽  
Vol 10 (5) ◽  
pp. 3185-3203 ◽  
Author(s):  
L. Merbold ◽  
C. Steinlin ◽  
F. Hagedorn
Keyword(s):  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Eddy Covariance ◽  
Winter Season ◽  
Swiss Alps ◽  
Gas Emissions ◽  
Gas Fluxes ◽  
Gradient Technique ◽  
Greenhouse Gas Fluxes ◽  
N2o Fluxes

Abstract. Although greenhouse gas emissions during winter contribute significantly to annual balances, their quantification is still highly uncertain in snow-covered ecosystems. Here, carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) fluxes were measured at a subalpine managed grassland in Switzerland using concentration gradients within the snowpack (CO2, CH4, N2O) and the eddy covariance method (CO2) during the winter 2010/2011. Our objectives were (1) to identify the temporal and spatial variation of greenhouse gases (GHGs) and their drivers, and (2) to estimate the GHG budget of the site during this specific season (1 December–31 March, 121 days). Mean winter fluxes (December–March) based on the gradient method were 0.77 ± 0.54 μmol m−2 s−1 for CO2 (1.19 ± 1.05 μmol m−2 s−1 measured by eddy covariance), −0.14 ± 0.09 nmol m−2 s−1 for CH4 and 0.23 ± 0.23 nmol m−2 s−1 for N2O, respectively. In comparison with the CO2 fluxes measured by eddy covariance, the gradient technique underestimated the effluxes by 50%. While CO2 and CH4 fluxes decreased with the progressing winter season, N2O fluxes did not follow a seasonal pattern. The major variables correlating with the fluxes of CO2 and CH4 were soil temperature and snow water equivalent, which is based on snow height and snow density. N2O fluxes were only explained poorly by any of the measured environmental variables. Spatial variability across the valley floor was smallest for CO2 and largest for N2O. During the winter season 2010/2011, greenhouse gas fluxes ranged between 550 ± 540 g CO2 m−2 estimated by the eddy covariance approach and 543 ± 247 g CO2 m−2, −0.4 ± 0.01 g CH4 m−2 and 0.11 ± 0.1 g N2O m−2 derived by the gradient technique. Total seasonal greenhouse gas emissions from the grassland were between 574 ± 276 and 581 ± 569 g CO2 eq. m−2, with N2O contributing 5% to the overall budget and CH4 reducing the budget by 0.1%. Cumulative budgets of CO2 were smaller than emissions reported for other subalpine meadows in the Swiss Alps and the Rocky Mountains. Further investigations on the GHG exchange of grasslands in winter are needed in order to (1) deepen our currently limited knowledge on the environmental drivers of each GHG, (2) to thoroughly constrain annual balances, and (3) to project possible changes in GHG flux magnitude with expected shorter and warmer winter periods.

scholarly journals Challenges in scaling up greenhouse gas fluxes: experience from the UK Greenhouse Gas Emissions and Feedbacks Programme

2021 ◽  
Author(s):  
Peter Levy ◽  
Robert Jon Clement ◽  
Nicholas Jon Cowan ◽  
Ben Keane ◽  
Vasileios Myrgiotis ◽  
...  
Keyword(s):  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Scaling Up ◽  
Gas Emissions ◽  
Gas Fluxes ◽  
Greenhouse Gas Fluxes ◽  
The Uk

Greenhouse gas fluxes in a no-tillage chronosequence in Central Ohio

2022 ◽  
Vol 218 ◽  
pp. 105313
Author(s):  
Serdar Bilen ◽  
Pierre-Andre Jacinthe ◽  
Raj Shrestha ◽  
Sindhu Jagadamma ◽  
Toru Nakajima ◽  
...  
Keyword(s):  
Greenhouse Gas ◽  
No Tillage ◽  
Gas Fluxes ◽  
Greenhouse Gas Fluxes

Monitoring Greenhouse Gas Fluxes in Agro-ecosystems

2018 ◽  
pp. 25-50
Author(s):  
Sunayan Saha ◽  
Paramjit Singh Minhas ◽  
Ramlal Choudhary
Keyword(s):  
Greenhouse Gas ◽  
Gas Fluxes ◽  
Greenhouse Gas Fluxes

scholarly journals Emissions of carbon dioxide and methane from fields fertilized with digestate from an agricultural biogas plant

2018 ◽  
Vol 32 (1) ◽  
pp. 29-37 ◽  
Author(s):  
Robert Czubaszek ◽  
Agnieszka Wysocka-Czubaszek
Keyword(s):  
Carbon Dioxide ◽  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Eddy Covariance ◽  
Soil Structure ◽  
Mineral Fertilizers ◽  
Gas Emissions ◽  
Gas Fluxes ◽  
Biogas Plants ◽  
Eddy Covariance System

AbstractDigestate from biogas plants can play important role in agriculture by providing nutrients, improving soil structure and reducing the use of mineral fertilizers. Still, less is known about greenhouse gas emissions from soil during and after digestate application. The aim of the study was to estimate the emissions of carbon dioxide (CO2) and methane (CH4) from a field which was fertilized with digestate. The gas fluxes were measured with the eddy covariance system. Each day, the eddy covariance system was installed in various places of the field, depending on the dominant wind direction, so that each time the results were obtained from an area where the digestate was distributed. The results showed the relatively low impact of the studied gases emissions on total greenhouse gas emissions from agriculture. Maximum values of the CO2and CH4fluxes, 79.62 and 3.049 µmol s−1m−2, respectively, were observed during digestate spreading on the surface of the field. On the same day, the digestate was mixed with the topsoil layer using a disc harrow. This resulted in increased CO2emissions the following day. Intense mineralization of digestate, observed after fertilization may not give the expected effects in terms of protection and enrichment of soil organic matter.

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