The imprint of desalinated seawater on recycled wastewater: Consequences for irrigation in Lanzarote Island, Spain

作者：Diaz Francisco J^*; Tejedor Marisa; Jimenez Concepcion; Grattan Steve R; Dorta Maria; Hernandez Jose M

来源：Agricultural Water Management, 2013, 116: 62-72.

DOI：10.1016/j.agwat.2012.10.011

• Non-conventional water resources
• Seawater desalination
• Arid Zones
• Agricultural irrigation
• Soil salinity

Seawater desalination and recycling of urban wastewater originating from desalinated seawater are the only sources of irrigation water on the extremely arid (similar to 150 mm year(-1)) Spanish island of Lanzarote. Irrigation with these two types of water has been introduced over the past few decades-in traditional miffed agriculture systems as a means to increase crop production. The present study was carried ut to evaluate the long term impact (5-30 years) of irrigation with desalinated seawater (DSW) and recycled wastewater originating from desalinated water (RWW) on the island%26apos;s soils used for fanning. The effects of irrigation were studied by evaluating the chemical characteristics of the topsoil of DSW-irrigated plots, RWW-irrigated plots and adjacent rainfed plots used as controls. The data indicate that irrigation with DSW and RWW has increased soil salinity by a factor of 1.9 and 3.4, respectively, and boron concentrations by a factor of 1.8 and 1.9, respectively, in relation to the control soils. Irrigation with RWW has also led to a rise in sodicity, where SAR values increased by a factor of 1.6 with respect to the control soil%26apos;s. Apart from these effects DSW irrigation was not found to cause further adverse effects in regards to soil fertility. The long-term sustainability of these farming systems requires-substantial improvements-in DSW quality, Which in turn will improve the quality of the RWW.

• 出版日期2013-1-1