SALINIZATION POTENTIAL RISK DUE TO IRRIGATION ON A GLOBAL SCALE

Abstract

 World population would generally increase until 2100. To cope with the population growth, it is necessary to build a sustainable agricultural production system. Salinization is one of the factors that threaten sustainable land use in farmlands. In this study, we focused on potential risk of salinization to both irrigated and rainfed farmlands. We selected five factors which were soil type, dryness, groundwater level, groundwater condition and irrigation method on the basis of salinaization mechanism. As a result, we could make distribution map of salinization of potential risk on a global scale, and clarified that a high potential risk areas of salinization are 20% of the irrigated farmland which have some potential risk. In rainfed farmland, we showed potential risk areas of salinization are 65%.