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Consequences of future nutrient load scenarios on multiple benefits of agricultural production

机译:未来养分负荷情景对农业生产多种惠益的影响

摘要

Nutrient load rates to the Baltic Sea need to be reduced. Agricultural land is regarded as the most significant contributor to the loads, and measures to reduce losses of nitrogen (N) and phosphorus (P) loads have been proposed, both for the near and far future. Agricultural production was to a large extent considered in these scenarios, whereas effects on other ecosystem services were not evaluated. The question to be answered by this report is whether the measures adopted to reduce N and P losses improve or impair multiple benefits of agriculture. The question is answered for a specific catchment (Svärtaån) located in Sweden, but the method is thoroughly described to provide a potential method to also evaluate other catchments. This work was performed as a part of the Baltic Compass project (2013).udThe answer to the main question of whether the measures adopted to reduce N and P losses from agricultural fields improved or impaired multiple benefits of agriculture, seems to be that they improved. Most of the BAP measures had a positive influence on most of the MB-categories, the clearest exception being liming in tile drains which only improved the cost effectiveness. Except for water protection, the biosecurity MB-category was positively influenced by the most measures (6 out of 9) and with soil quality the next highest (5 out of 9). It is less clear how the absolute values evaluated for the MB index, can be compared among MB-categories. Among the BAP-measures, structural liming was the most positive measure (summing up the indices of all MB-categories), followed by buffer-zones and spring cultivation the next, although the cost effectiveness of these latter measures was evaluated to decrease. In the “unavoidable” future (Future scenarios) GHG emissions strongly increased. The only measure that mitigated that effect was reduced N fertilisation, providing more arguments for applying reduced fertilisation than only to reduce leaching.ud
机译:波罗的海的营养负荷率需要降低。耕地被认为是造成负荷最大的因素,并且已经提出了在短期和短期内减少氮(N)和磷(P)负荷损失的措施。在这些情况下,很大程度上考虑了农业生产,但未评估对其他生态系统服务的影响。本报告要回答的问题是,为减少氮磷损失而采取的措施是改善还是损害了农业的多重利益。对于位于瑞典的特定流域(Svärtaån),该问题得到了解答,但对该方法进行了全面描述,以提供一种可能的方法来评估其他流域。这项工作是波罗的海指南针项目(2013)的一部分。 ud对减少农业领域氮和磷损失所采取的措施是改善还是削弱了农业的多重收益的主要问题的答案似乎是改善。大多数BAP措施对大多数MB类别都有积极影响,最明显的例外是瓷砖排水沟中的石灰,这只会提高成本效益。除水保护外,生物安全性MB类别受到最多措施的积极影响(9之6),而土壤质量次之(9之5)。尚不清楚如何在MB类之间比较为MB索引评估的绝对值。在BAP措施中,结构性灰泥是最积极的措施(汇总所有MB类别的指数),其次是缓冲区和春季栽培,尽管评估了这些措施的成本效益降低。在“不可避免”的未来(未来情景)中,温室气体排放量大幅增加。减少氮肥影响的唯一措施是减少氮肥施用量,这为减少肥料施用量提供了更多论据,而不仅仅是减少浸出。

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