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首页> 外文期刊>Agricultural Systems >Comparing energy balances, greenhouse gas balances and biodiversity impacts of contrasting farming systems with alternative land uses.
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Comparing energy balances, greenhouse gas balances and biodiversity impacts of contrasting farming systems with alternative land uses.

机译：比较不同的耕作制度与替代土地用途的能源平衡，温室气体平衡和生物多样性影响。

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摘要

Life cycle assessment (LCA) is commonly used for comparing environmental impacts of contrasting farming systems. However, the interpretation of agricultural LCA studies may be flawed when the alternative land use options are not properly taken into account. This study compared energy and greenhouse gas (GHG) balances and biodiversity impacts of different farming systems by using LCA accompanied by an assessment of alternative land uses. Farm area and food product output were set equal across all of the farm models, and any land remaining available after the food crop production requirement had been met was assumed to be used for other purposes. Three different management options for that land area were compared: Miscanthus energy crop production, managed forest and natural forest. The results illustrate the significance of taking into account the alternative land use options and suggest that integrated farming systems have potential to improve the energy and GHG balances and biodiversity compared to both organic and conventional systems. Sensitivity analysis shows that the models are most sensitive for crop and biogas yields and for the nitrous oxide emission factors. This paper provides an approach that can be further developed for identifying land management systems that optimize food production and environmental benefits.
机译：生命周期评估（LCA）通常用于比较对比农业系统对环境的影响。但是，如果未适当考虑其他土地使用方案，则对农业LCA研究的解释可能会存在缺陷。这项研究通过使用LCA和替代土地利用的评估，比较了不同耕作系统的能量和温室气体（GHG）平衡以及生物多样性的影响。在所有农场模式中，农场面积和粮食产品产量均设置为相等，并且在满足粮食作物生产要求后剩余的可用土地均假定用于其他目的。比较了该土地区域的三种不同管理方案：芒草能源作物生产，人工林和天然林。结果说明了考虑替代土地使用方案的重要性，并表明与有机和常规系统相比，综合耕作制度具有改善能源和温室气体平衡以及生物多样性的潜力。敏感性分析表明，该模型对农作物和沼气产量以及一氧化二氮排放因子最敏感。本文提供了一种方法，可以进一步开发该方法来识别可优化粮食生产和环境效益的土地管理系统。

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