Soil carbon sequestration rates and associated economic costs for farming systems of south-eastern Australia

被引:28
|
作者
Grace, Peter R. [1 ]
Antle, John [2 ]
Ogle, Stephen [3 ]
Paustian, Keith [3 ,4 ]
Basso, Bruno [1 ,5 ]
机构
[1] Queensland Univ Technol, Inst Sustainable Resources, Brisbane, Qld 4000, Australia
[2] Oregon State Univ, Dept Agr & Resource Econ, Corvallis, OR 97331 USA
[3] Colorado State Univ, Nat Resource Ecol Lab, Ft Collins, CO 80523 USA
[4] Colorado State Univ, Dept Soil & Crop Sci, Ft Collins, CO 80523 USA
[5] Univ Basilicata, I-85100 Potenza, Italy
来源
AUSTRALIAN JOURNAL OF SOIL RESEARCH | 2010年 / 48卷 / 08期
关键词
carbon sequestration; conservation tillage; economics; greenhouse gases; ORGANIC-CARBON; MANAGEMENT IMPACTS; LAND-USE; AGRICULTURE; TILLAGE; ACCUMULATION; STORAGE; STUBBLE;
D O I
10.1071/SR10063
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Soil organic carbon (C) sequestration rates based on the Intergovernmental Panel for Climate Change (IPCC) methodology were combined with local economic data to simulate the economic potential for C sequestration in response to conservation tillage in the six agro-ecological zones within the Southern Region of the Australian grains industry. The net C sequestration rate over 20 years for the Southern Region (which includes discounting for associated greenhouse gases) is estimated to be 3.6 or 6.3 Mg C/ha after converting to either minimum or no-tillage practices, respectively, with no-till practices estimated to return 75% more carbon on average than minimum tillage. The highest net gains in C per ha are realised when converting from conventional to no-tillage practices in the high-activity clay soils of the High Rainfall and Wimmera agro-ecological zones. On the basis of total area available for change, the Slopes agro-ecological zone offers the highest net returns, potentially sequestering an additional 7.1 Mt C under no-tillage scenario over 20 years. The economic analysis was summarised as C supply curves for each of the 6 zones expressing the total additional C accumulated over 20 years for a price per t C sequestered ranging from zero to AU$200. For a price of $50/Mg C, a total of 427 000 Mg C would be sequestered over 20 years across the Southern Region, <5% of the simulated C sequestration potential of 9.1 Mt for the region. The Wimmera and Mid-North offer the largest gains in C under minimum tillage over 20 years of all zones for all C prices. For the no-tillage scenario, for a price of $50/Mg C, 1.74 Mt C would be sequestered over 20 years across the Southern Region, <10% of the simulated C sequestration potential of 18.6 Mt for the region over 20 years. The Slopes agro-ecological zone offers the best return in C over 20 years under no-tillage for all C prices. The Mallee offers the least return for both minimum and no-tillage scenarios. At a price of $200/Mg C, the transition from conventional tillage to minimum or no-tillage practices will only realise 19% and 33%, respectively, of the total biogeochemical sequestration potential of crop and pasture systems of the Southern Region over a 20-year period.
引用
收藏
页码:720 / 729
页数:10
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