scholarly journals Conservation agriculture based on diversified and high-performance production system leads to soil carbon sequestration in subtropical environments

2019 ◽  
Vol 219 ◽  
pp. 136-147 ◽  
Author(s):  
Daniel Ruiz Potma Gonçalves ◽  
João Carlos de Moraes Sá ◽  
Umakant Mishra ◽  
Allison José Fornari ◽  
Flávia Juliana Ferreira Furlan ◽  
...  
Keyword(s):  
Carbon Sequestration ◽  
Soil Carbon ◽  
Production System ◽  
High Performance ◽  
Conservation Agriculture ◽  
Soil Carbon Sequestration

scholarly journals Challenges of soil carbon sequestration in NENA Region

2018 ◽  
Author(s):  
Talal Darwish ◽  
Therese Atallah ◽  
Ali Fadel
Keyword(s):  
Carbon Sequestration ◽  
Soil Carbon ◽  
Agricultural Practices ◽  
Conservation Agriculture ◽  
Belowground Biomass ◽  
Soil Carbon Sequestration ◽  
Nitrogen Fertilizers ◽  
Land Capability ◽  
North East ◽  
Modest Contribution

Abstract. North East North Africa (NENA) region spans over 14 % of the total surface of the Earth and hosts 10 % of its population. Soils of the NENA region are mostly highly vulnerable to degradation, and food security will depend much on sustainable agricultural measures. Weather variability, drought and depleting vegetation are dominant causes of the decline in soil organic carbon (SOC). In this work the situation of SOC was studied, using a land capability model and soil mapping. The land capability model showed that most NENA countries (17 out of 20), suffer from low productive lands (> 80 %). Stocks of SOC were mapped (1 : 5 Million) in topsoils (0–30 cm) and subsoils (30–100 cm). The maps showed that 69 % of soil resources present a stock of SOC below the threshold of 30 t ha−1. The stocks varied between ≈ 10 t ha−1 in shrublands and 60 t ha−1 for evergreen forests. Highest stocks were found in forests, irrigated crops, mixed orchards and saline flooded vegetation. The stocks of SIC were higher than those of SOC. In subsoils, the SIC ranged between 25 and 450 t ha−1, against 20 to 45 t ha−1 for SOC. This paper also highlights the modest contribution of NENA region to global SOC stock in the topsoil not exceeding 4.1 %. The paper also discusses agricultural practices that are favorable to carbon sequestration. Practices of conservation agriculture could be effective, as the presence of soil cover reduces the evaporation, water and wind erosions. Further, the introduction of legumes, as part of a cereal-legume rotation, and the application of nitrogen fertilizers to the cereal, caused a notable increase of SOC after 10 years. The effects of crop rotations on SOC are related to the amounts of above and belowground biomass produced and retained in the system. Some knowledge gaps exist especially in aspects related to the effect of irrigation on SOC, and on SIC at the level of soil profile and soil landscape. Still, major constraints facing soil carbon sequestration are policy relevant and socio-economic in nature, rather than scientific.

Conservation Agriculture and Soil Carbon Sequestration: Between Myth and Farmer Reality

2009 ◽  
Vol 28 (3) ◽  
pp. 97-122 ◽  
Author(s):  
B. Govaerts∗ ◽  
N. Verhulst∗ ◽  
A. Castellanos-Navarrete ◽  
K. D. Sayre ◽  
J. Dixon ◽  
...  
Keyword(s):  
Carbon Sequestration ◽  
Soil Carbon ◽  
Conservation Agriculture ◽  
Soil Carbon Sequestration

Can conservation agriculture increase soil carbon sequestration? A modelling approach

Geoderma ◽  
2020 ◽  
Vol 369 ◽  
pp. 114298 ◽  
Author(s):  
Elena Valkama ◽  
Gulya Kunypiyaeva ◽  
Rauan Zhapayev ◽  
Muratbek Karabayev ◽  
Erbol Zhusupbekov ◽  
...  
Keyword(s):  
Carbon Sequestration ◽  
Soil Carbon ◽  
Conservation Agriculture ◽  
Soil Carbon Sequestration ◽  
Modelling Approach

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

2014 ◽  
Vol 11 (22) ◽  
pp. 6221-6236 ◽  
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 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 emissions) over a complete year, and 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), and 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, 0.09 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 effects 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 Climate drives global soil carbon sequestration and crop yield changes under conservation agriculture

2020 ◽  
Vol 26 (6) ◽  
pp. 3325-3335 ◽  
Author(s):  
Wenjuan Sun ◽  
Josep G. Canadell ◽  
Lijun Yu ◽  
Lingfei Yu ◽  
Wen Zhang ◽  
...  
Keyword(s):  
Carbon Sequestration ◽  
Soil Carbon ◽  
Crop Yield ◽  
Conservation Agriculture ◽  
Soil Carbon Sequestration ◽  
Global Soil

Poverty, risk, and the supply of soil carbon sequestration

2008 ◽  
Vol 13 (3) ◽  
pp. 353-373 ◽  
Author(s):  
JOSHUA GRAFF-ZIVIN ◽  
LESLIE LIPPER
Keyword(s):  
Carbon Sequestration ◽  
Soil Carbon ◽  
Low Income ◽  
Production Systems ◽  
Conservation Agriculture ◽  
Relative Strength ◽  
Soil Carbon Sequestration ◽  
Agricultural Output ◽  
Dynamic Optimization Model ◽  
The Impact

ABSTRACTWe explore poor farmers' incentives to adopt production systems that increase soil carbon sequestration, focusing on the impact of risk. A dynamic optimization model of conservation agriculture adoption is presented, where farmers optimize over expected utility of profits from agriculture and carbon sequestration. Adoption impacts on agricultural productivity are modeled as a combination of the technological effects of the new system, and productivity effects of changes in soil carbon on agricultural output. Comparative static results indicate increases in soil carbon sequestration price and the discount rate have unambiguous impacts on equilibrium soil carbon levels; the former leading to higher, and the latter to lower, carbon levels. Increases in the price of agricultural output and risk aversion have ambiguous impacts, depending on the relative strength of the productivity and technology effects. The paper concludes with a discussion of designing soil carbon payment mechanisms to benefit low income farmers.

Sign in / Sign up

Export Citation Format

Share Document