...
首页> 外文期刊>Journal of Cleaner Production >Reconciling irrigation demands for agricultural expansion with environmental sustainability - A preliminary assessment for the Ica Valley, Peru
【24h】

Reconciling irrigation demands for agricultural expansion with environmental sustainability - A preliminary assessment for the Ica Valley, Peru

机译:协调与环境可持续性的农业扩张灌溉需求 - 秘鲁ICA谷的初步评估

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       

摘要

Irrigation expansion driven by a growing global food demand is threatening the sustainability of scarce water resources. An exemplar is the Ica Valley in Peru which has experienced significant agricultural transformation over the last three decades with uncontrolled abstractions leading to over-exploitation of the Ica-Villacuri aquifer. This paper critically assesses the impacts of agricultural expansion on the longterm sustainability of groundwater resources in the Ica Valley. We apply a combination of spatial analysis and irrigation modelling by farming type (large and small-scale), followed by a multi-criteria assessment on irrigation water use. Historical trends in cropped area were analysed using Landsat satellite imagery to identify agricultural expansion and the changing composition between large and small-scale farms. The blue water footprint (WFblue) for croplands was calculated distinguishing between surface and groundwater abstractions for eight disaggregated geographical zones within the Ica Valley. The economic benefits of water consumption were assessed using the water productivity indicator, and the environmental sustainability of water resources spatially evaluated using a monthly blue water sustainability index and adapted version of the groundwater debt. The analyses showed that the groundwater footprint accounts for 87% of the total WFblue (483 Mm(3)) with 286 Mm(3) groundwater consumed under unsustainable conditions (exceeding groundwater recharge). The highest water productivity (2.4-5.4 sol/ton) occurs in zones with intensive groundwater abstractions and where most large-farms are located, but it is also where the sustainability issue is most acute. Modelling showed that based on existing climate conditions and cropping patterns, irrigated agriculture is locally unsustainable throughout the valley, with the exception of small-scale farming in the peri-urban and middle valley areas. Around 10% of total aquifer recharge results from small-scale irrigated farming, whereas recharge from large scale farming is negligible. The greatest impacts occur in zones dominated by large-scale farms, where a period of 3.7-5.9 years is estimated to be needed to replenish water resources consumed by agricultural production. There is thus an urgent need to manage water resources more effectively and promote more sustainable use of water to protect both traditional and agro-export agricultural practices as well as allocations for urban water supply and the environment. (C) 2020 The Author(s). Published by Elsevier Ltd.
机译:由于越来越多的全球粮食需求推动的灌溉扩张正在威胁到稀缺水资源的可持续性。示例是秘鲁的ICA山谷,在过去三十年中经历了显着的农业转变,不受控制的抽象导致ICA-Villacuri含水层过度开发。本文批判性地评估农业扩张对ICA山谷地下水资源的长期可持续性的影响。我们通过农业类型(大型和小规模)应用空间分析和灌溉建模的组合,然后在灌溉用水中进行多标准评估。使用Landsat卫星图像分析裁剪区域的历史趋势,以确定农业扩张和大型农场之间的变化组成。在ICA谷内的八个分类地理区的表面和地下水抽象中计算了耕地的蓝色水脚印(WFBlue)。利用水生产率指标评估了耗水的经济效益,利用每月蓝水可持续性指数和适应地下水债务的适应版本的水资源的环境可持续性。分析表明,地下水足迹占总WFBlue的87%(483毫米(3)),在不可持续的条件下消耗286毫米(3)个地下水(超过地下水补给)。最高水生产率(2.4-5.4溶胶/吨)发生在具有密集地下水抽象的区域,大多数大农场所在的地方发生,但也是可持续性问题最敏锐的地方。建模显示,基于现有的气候条件和种植模式,灌溉农业在整个山谷中局部不可持续,除了围城和中谷地区的小规模农业。大约10%的含水层补给来自小规模灌溉养殖,而大规模农业的充值可忽略不计。最大的影响发生在由大型农场主导的区域,估计需要3.7-5.9岁的时间,以补充农业生产消耗的水资源。因此,迫切需要更有效地管理水资源,促进水资源的更可持续利用,以保护传统和农业出口的农业实践以及城市供水和环境的拨款。 (c)2020提交人。 elsevier有限公司出版

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号