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首页> 外文期刊>Agricultural Systems >Assessing costs of soil carbon sequestration by crop-livestock farmers in Western Australia.
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Assessing costs of soil carbon sequestration by crop-livestock farmers in Western Australia.

机译：评估西澳大利亚州农作物-畜牧业农民的固碳成本。

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Carbon sequestration in agricultural soil has been identified as a potential strategy to offset greenhouse gas emissions. Within the public debate, it has been claimed that provision of positive incentives for farmers to change their land management will result in substantial carbon sequestration in agricultural soils at a low carbon price. However, there is little information about the costs or benefits of carbon sequestration in agricultural soils to test these claims. In this study, the costeffectiveness of alternative land-use and land-management practices that can increase soil carbon sequestration is analysed by integrating biophysical modelling of carbon sequestration with wholefarm economic modelling. Results suggest that, for a case study model of a crop-livestock farm in the Western Australian wheatbelt, sequestering higher levels of soil carbon by changing rotations (to include longer pasture phases) incur considerable opportunity costs. Under current commodity prices, farmers would forego more than $80 in profit for every additional tonne of CO2-e stored in soil, depending on their adoption of crop residue retention practices. This is much higher than the initial carbon price of $23 t-1 in Australia's recently legislated carbon tax. This analysis does not incorporate the possibility that greenhouse gas emissions may increase as a result of including longer pasture phases. Accounting for emissions may substantially reduce the potential for net carbon sequestration at low carbon prices.
机译：已将农业土壤中的碳固存确定为抵消温室气体排放的潜在策略。在公开辩论中，有人声称，为农民提供改变土地管理的积极激励措施，将导致低碳价的农业土壤中大量的碳固存。但是，关于测试这些说法的农业土壤中固碳的成本或收益的信息很少。在这项研究中，通过将碳固存的生物物理模型与全农场经济模型相结合，分析了可以增加土壤碳固存的替代土地利用和土地管理实践的成本效益。结果表明，对于一个西澳大利亚州小麦带农作物农场的案例研究模型，通过改变轮作（包括更长的牧草阶段）来隔离更高水平的土壤碳，会带来可观的机会成本。在目前的商品价格下，农民每保留一吨土壤中的CO 2 -e就要放弃80美元以上的利润，这取决于他们采用的作物残渣保留方法。这远高于澳大利亚最近立法的碳税中最初的碳价$ 23 t -1 。该分析没有考虑到由于牧场期延长而导致温室气体排放量增加的可能性。考虑排放量可能会大大降低低碳价格下净碳固存的潜力。

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