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首页> 外文期刊>Australian Journal of Soil Research >Soil carbon sequestration rates and associated economic costs for farming systems of south-eastern Australia.
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Soil carbon sequestration rates and associated economic costs for farming systems of south-eastern Australia.

机译：澳大利亚东南部农业系统的土壤固碳率和相关经济成本。

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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 MtC 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.
机译：将基于政府间气候变化专门委员会（IPCC）方法论的土壤有机碳（C）固存率与当地经济数据相结合，以模拟响应南部地区六个农业生态区的保护性耕作进行固碳的经济潜力澳大利亚谷物工业。南部地区20年的净碳固存率（包括相关温室气体的折现）在分别采用免耕法或免耕法后，估计分别为3.6或6.3 Mg C / ha。估计平均可比最低耕作方式多返还75％的碳。在高降雨和Wimmera农业生态区的高活性粘土土壤中，从常规耕作转化为免耕实践时，可以实现最高的每公顷C净收益。根据可改变的总面积，坡地农业生态区提供最高的净回报，在免耕的情况下，可能在20年内隔离额外的7.1 MtC。经济分析总结为六个区域中每个区域的碳供应曲线，表示每20吨C的固定价格为20到20澳元，累积的额外C总量。以50美元/ Mg C的价格，整个南部地区在20年内将总共螯合427 000 Mg C，不到该地区9.1 Mt的模拟C螯合潜力的5％。在所有碳价范围内，威米尔（Wimmera）和中北部（North Mid-North）在20年内的所有区域中以最小耕作量提供最大的碳收益。在免耕的情况下，以50美元/ Mg C的价格，南部地区在20年内将封存1.74 Mt C，不到该区域20年内模拟C封存潜力18.6 Mt的10％。在所有耕种价格下，坡耕农业生态区在免耕的情况下可提供20年来最佳的耕种收益。在最低免耕情况下，Mallee提供的回报最少。以200美元/ Mg C的价格，从传统耕作到最小耕作或免耕耕作的转变将分别仅占20个地区南部南部农作物和牧场系统生物地球化学螯合潜力的19％和33％。年期间。

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