scholarly journals Characterising the biophysical, economic and social impacts of soil carbon sequestration as a greenhouse gas removal technology

2019 ◽  
Vol 26 (3) ◽  
pp. 1085-1108 ◽  
Author(s):  
Alasdair J. Sykes ◽  
Michael Macleod ◽  
Vera Eory ◽  
Robert M. Rees ◽  
Florian Payen ◽  
...  
Keyword(s):  
Carbon Sequestration ◽  
Soil Carbon ◽  
Greenhouse Gas ◽  
Social Impacts ◽  
Soil Carbon Sequestration ◽  
Gas Removal ◽  
Removal Technology ◽  
Economic And Social Impacts ◽  
Greenhouse Gas Removal

scholarly journals How to measure, report and verify soil carbon change to realize the potential of soil carbon sequestration for atmospheric greenhouse gas removal

2019 ◽  
Vol 26 (1) ◽  
pp. 219-241 ◽  
Author(s):  
Pete Smith ◽  
Jean‐Francois Soussana ◽  
Denis Angers ◽  
Louis Schipper ◽  
Claire Chenu ◽  
...  
Keyword(s):  
Carbon Sequestration ◽  
Soil Carbon ◽  
Greenhouse Gas ◽  
Soil Carbon Sequestration ◽  
Gas Removal ◽  
Soil Carbon Change ◽  
Carbon Change ◽  
Greenhouse Gas Removal

scholarly journals Water-saving ground cover rice production system reduces net greenhouse gas fluxes in an annual rice-based cropping system

2014 ◽  
Vol 11 (6) ◽  
pp. 8925-8967 ◽  
Author(s):  
Z. Yao ◽  
Y. Du ◽  
Y. Tao ◽  
X. Zheng ◽  
C. Liu ◽  
...  
Keyword(s):  
Carbon Sequestration ◽  
Soil Carbon ◽  
Greenhouse Gas ◽  
Production System ◽  
Cropping System ◽  
Ground Cover ◽  
Water Saving ◽  
Soil Carbon Sequestration ◽  
Chicken Manure ◽  
Ch4 And N2o

Abstract. To safeguard food security and preserve precious water resources, the technology of water-saving ground cover rice production system (GCRPS) is being increasingly adopted for the rice cultivation. However, changes in soil water status and temperature under GCRPS may affect soil biogeochemical processes that control the biosphere–atmosphere exchanges of methane (CH4), nitrous oxide (N2O) and carbon dioxide (CO2). The overall goal of this study is to better understand how net ecosystem greenhouse gas exchanges (NEGE) and grain yields are affected by GCRPS in an annual rice-based cropping system. Our evaluation was based on measurements of the CH4 and N2O fluxes and soil heterotrophic respiration (CO2 emission) over a complete year, as well as the estimated soil carbon sequestration intensity for six different fertilizer treatments for conventional paddy and GCRPS. The fertilizer treatments included urea application and no N fertilization for both conventional paddy (CUN and CNN) and GCRPS (GUN and GNN), solely chicken manure (GCM) and combined urea and chicken manure applications (GUM) for GCRPS. Averaging across all the fertilizer treatments, GCRPS increased annual N2O emission and grain yield by 40% and 9%, respectively, and decreased annual CH4 emission by 69%, while GCRPS did not affect soil CO2 emissions relative to the conventional paddy. The annual direct emission factors of N2O were 4.01, 0.087 and 0.50% for GUN, GCM and GUM, respectively, and 1.52% for the conventional paddy (CUN). The annual soil carbon sequestration intensity under GCRPS was estimated to be an average of −1.33 Mg C ha−1 yr−1, which is approximately 44% higher than the conventional paddy. The annual NEGE were 10.80–11.02 Mg CO2-eq ha−1 yr−1 for the conventional paddy and 3.05–9.37 Mg CO2-eq ha−1 yr−1 for the GCRPS, suggesting the potential feasibility of GCRPS in reducing net greenhouse effect from rice cultivation. Using organic fertilizers for GCRPS considerably reduced annual emissions of CH4 and N2O and increased soil carbon sequestration, resulting in the lowest NEGE (3.05–5.00 Mg CO2-eq ha−1 yr−1). Accordingly, water-saving GCRPS with organic fertilizer amendments was considered the most promising management regime for simultaneously achieving relatively high grain yield and reduced net greenhouse gas emission.

scholarly journals The greenhouse gas impacts of converting food production in England and Wales to organic methods

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Laurence G. Smith ◽  
Guy J. D. Kirk ◽  
Philip J. Jones ◽  
Adrian G. Williams
Keyword(s):  
Carbon Sequestration ◽  
Soil Carbon ◽  
Greenhouse Gas ◽  
Organic Farming ◽  
Food Production ◽  
Ghg Emissions ◽  
Soil Carbon Sequestration ◽  
England And Wales ◽  
Reduce Emissions ◽  
Farm Inputs

Abstract Agriculture is a major contributor to global greenhouse gas (GHG) emissions and must feature in efforts to reduce emissions. Organic farming might contribute to this through decreased use of farm inputs and increased soil carbon sequestration, but it might also exacerbate emissions through greater food production elsewhere to make up for lower organic yields. To date there has been no rigorous assessment of this potential at national scales. Here we assess the consequences for net GHG emissions of a 100% shift to organic food production in England and Wales using life-cycle assessment. We predict major shortfalls in production of most agricultural products against a conventional baseline. Direct GHG emissions are reduced with organic farming, but when increased overseas land use to compensate for shortfalls in domestic supply are factored in, net emissions are greater. Enhanced soil carbon sequestration could offset only a small part of the higher overseas emissions.

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