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Tottori University (2014)

Studies on land and wate ruse, and groundwater fluctuation under irrigated agriculture in aridland

Anzai, Toshihiko

Titre : Studies on land and wate ruse, and groundwater fluctuation under irrigated agriculture in aridland

Auteur : Anzai, Toshihiko

Université de soutenance : Tottori University

Grade : Doctoral Thesis 2014

Sommaire partiel
In order to conduct irrigated agriculture sustainably in arid land, securing and using the limited water resources appropriately is a prerequisite for sustainability. The large-scale irrigation district ofthelower Ili River BasininKazakhstan which islocated in an arid regionfacesthe possibilityof reduced water withdrawal from the Ili River. The main objective of this study was, therefore to clarify actual land and water use and make proposals for sustainable agriculture for the irrigation district. In this irrigation district, crop rotation which combines rice and non-rice crops is practiced. The crop rotation system was introduced to Aral Sea Basin and lower Ili River basin during the Soviet era. At the outset of introducing the crop rotation system, it was expected to help in leaching out accumulated salts during upland crop cultivation in the fields by converting rice cultivation to non-rice cultivation. However, the effect of leaching by rice cultivation did not necessarily work depending on the drainage function and soil texture in the lower soil layer. In Uzbekistan, government has been trying to decrease rice cultivation area with the purpose of reducing water withdrawalandcontrolsoilsalinization. Due to competition for water resource forSyr Darya and Ili River, water use adjustmentproblem among countries in upper and lower region has issued. In the lower Syr Darya and Ili River Basin, the crop rotation is practiced. If water resource could not be secured stably in these regions, the sustainability of the crop rotation system could be affected. In contrast to Syr Darya, it is difficult to solve the problem by constructing dams or regulating reservoirs on Ili River. Therefore, an appropriate resolution for the issue through negotiated settlement with China in upper Ili River basinandKazakhstanin lowerIliRiverbasinisdesirable

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