Water scarcity and the impact of improved irrigation management: a computable general equilibrium analysis

被引：88

作者：

Calzadilla, Alvaro ^{[1
,2
]}

Rehdanz, Katrin ^{[1
,3
]}

Tol, Richard S. J. ^{[4
,5
,6
]}

机构：

[1] Kiel Inst World Econ, D-24105 Kiel, Germany

[2] Int Max Planck Res Sch Earth Syst Modelling, D-20146 Hamburg, Germany

[3] Univ Kiel, Dept Econ, D-24118 Kiel, Germany

[4] Econ & Social Res Inst, Dublin 2, Ireland

[5] Vrije Univ Amsterdam, Inst Environm Studies, NL-1081 HV Amsterdam, Netherlands

[6] Vrije Univ Amsterdam, Dept Spatial Econ, NL-1081 HV Amsterdam, Netherlands

来源：

AGRICULTURAL ECONOMICS | 2011年 / 42卷 / 03期

关键词：

D58; Q17; Q25; Computable general equilibrium; Irrigation; Water policy; Water scarcity; Irrigation efficiency; ECONOMIC-IMPACT; VIRTUAL WATER; EFFICIENCY; PERFORMANCE; SYSTEMS; TRADE; WHEAT; CHINA;

D O I：

10.1111/j.1574-0862.2010.00516.x

中图分类号：

F3 [农业经济];

学科分类号：

0202 ; 020205 ; 1203 ;

摘要：

Increasing water scarcity combined with an increasing demand for food and water for irrigation call for a careful revision of water use in agriculture. Currently, less than 60% of all the water used for irrigation is effectively used by crops. Based on the new version of the GTAP-W model we analyze the effect of potential water savings and the welfare implications of improvements in irrigation efficiency worldwide. The results show that a water policy directed to improve irrigation efficiency led to global and regional water savings, but it is not beneficial for all regions. The final effect on regional welfare will depend on the interaction of several different causes. For instance, higher irrigation efficiency changes opportunity costs and reverses comparative advantages, modifying regional trade patterns and welfare. For water-stressed regions the effects on welfare are mostly positive. For nonwater scarce regions the results are more mixed and mostly negative. The results show that exports of virtual water are not exclusive of water abundant regions.

引用

页码：305 / 323

页数：19