• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Arid Land Research and Management >Soil and groundwater salinization in Siwa Oasis and management opportunities: twenty year change detection and assessment
【24h】

Soil and groundwater salinization in Siwa Oasis and management opportunities: twenty year change detection and assessment

机译：Siwa Oasis和管理机会的土壤和地下水盐渍化：二十年变更检测和评估

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The use of saline groundwater in irrigation due to the limited availability of fresh water is one of the main causes of land degradation in arid and semi-arid environments. The agro-ecosystem of Siwa Oasis was monitored over a period of two decades. A stable isotope study, oxygen-18 and deuterium, indicated that Siwa groundwater is of meteoric origin. Siwa has two groundwater aquifers: a shallow limestone aquifer, LA, with highly saline water (Total Dissolved Solids, TDS, up to 6848 mg/L), and a deep Nubian sandstone aquifer, NSA, containing fresh water (TDS 192-256 mg/L). The sodium adsorption ratio, SAR, of LA water is high with an average value of 13.9 while the SAR of NSA water is low with an average value of 2.1. Schoeller and Piper's diagrams showed that LA water was of sodium, chloride-sulfate type, while the NSA water was classified as sodium carbonate and bicarbonate water type. Saturation Index (SI) calculations showed that both the LA and NSA water were undersaturated to halite minerals. Consequently, there is room to accommodate extra Na+ and Cl- from halite. Most Siwa land is irrigated with LA water due to low drilling costs. LA groundwater and Siwa soils were found to be deteriorating dramatically and the average water and soil salinity increased by 30-36% per decade. No change in NSA water quality was recorded over the same period. Interventions for the restoration of the deteriorated Siwa ecosystem are summarized. The approach conducted in this study can be repeated in similar ecosystems.
机译：由于淡水的有限可用性而在灌溉中使用盐水地下水是干旱和半干旱环境中土地退化的主要原因之一。在二十年内监测了Siwa Oasis的农业生态系统。稳定的同位素研究，氧气-18和氘，表明Siwa地下水是流动源。 Siwa有两个地下水含水层：浅石灰石含水层，La，具有高度盐水水（总溶解固体，TDS，高达6848 mg / L），以及含有淡水的深Nubian砂岩含水层，含有淡水（TDS 192-256 Mg / l）。 LA水的钠吸附比SAR高，平均值为13.9，而NSA水的SAR较低，平均值为2.1。 Schoeller和吹笛者的图表显示了LA水是钠，氯化钠型，而NSA水被归类为碳酸钠和碳酸氢盐水类型。饱和度指数（Si）计算表明，La和NSA水均不受卤素矿物质。因此，有空间可以容纳额外的Na +和来自宿舍的Cl-。由于低钻井成本，大多数Siwa土地都用LA水灌溉。发现La地下水和Siwa土壤急剧下降，平均水和土壤盐度增加了30-36％。在同一时期内记录了NSA水质的变化。总结了恢复恶化的SiWA生态系统的干预。本研究中进行的方法可以在类似的生态系统中重复。

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