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Informing groundwater policies in semi-arid agricultural production regions under stochastic climate scenario impacts
Ecological Economics ( IF 7 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.ecolecon.2020.106908
Hermine Mitter , Erwin Schmid

Abstract Region-specific groundwater policies are required to regulate groundwater extraction for agricultural irrigation and reduce climate change adaption externalities. We examine the semi-arid Seewinkel region in Austria and explore interactions between climatic, agronomic, hydrological, and socio-economic conditions and processes to provide policy advice. The assessment is conducted with a spatially explicit integrated modeling framework to analyze impacts on land and irrigation water use, land management, and net benefits of agricultural production. The model results show that with imposed groundwater restrictions for irrigation, land use shifts from irrigated vineyards to mostly rainfed cropland with declining regional net benefits of agricultural production. The direction of change is similar for a DRY, SIMILAR, and WET climate scenario, while the magnitude differs. We estimate that an increase of the marginal value of groundwater extraction for irrigation by 0.1 €/m3 results in an average decrease in groundwater extraction volumes by 17.2 Mm3 in DRY, 6.3 Mm3 in SIMILAR, and 6.4 Mm3 in WET. Furthermore, regional net benefits of agricultural production decrease by 3.4 M€ in DRY and SIMILAR, and by 1.6 M€ in WET, on average. Our assessment highlights that efficient groundwater policies can help to sustain groundwater availability in semi-arid regions, particularly under climate change.

中文翻译:

在随机气候情景影响下为半干旱农业生产区的地下水政策提供信息

摘要 需要针对特定​​地区的地下水政策来规范用于农业灌溉的地下水提取并减少气候变化适应的外部性。我们考察了奥地利半干旱的 Seewinkel 地区,探索气候、农艺、水文和社会经济条件和过程之间的相互作用,以提供政策建议。评估是使用空间明确的综合建模框架进行的,以分析对土地和灌溉用水、土地管理和农业生产净收益的影响。模型结果表明,随着地下水灌溉限制的实施,土地利用从灌溉葡萄园转向主要是雨育农田,农业生产的区域净收益下降。对于干燥、类似和潮湿的气候情景,变化方向是相似的,而幅度不同。我们估计用于灌溉的地下水抽取的边际值增加 0.1 欧元/立方米会导致地下水抽取量平均减少 17.2 Mm3,DRY、SIMILAR 6.3 Mm3 和 WET 6.4 Mm3。此外,干旱和类似地区农业生产的区域净收益平均减少 340 万欧元,湿地农业生产净收益平均减少 160 万欧元。我们的评估强调,有效的地下水政策有助于维持半干旱地区的地下水供应,尤其是在气候变化的情况下。农业生产的区域净收益在 DRY 和 SIMILAR 中平均减少 340 万欧元,在 WET 中平均减少 160 万欧元。我们的评估强调,有效的地下水政策有助于维持半干旱地区的地下水供应,尤其是在气候变化的情况下。农业生产的区域净收益在 DRY 和 SIMILAR 中平均减少 340 万欧元,在 WET 中平均减少 160 万欧元。我们的评估强调,有效的地下水政策有助于维持半干旱地区的地下水供应,尤其是在气候变化的情况下。
更新日期:2021-02-01
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