Irrigation Alternatives and Agriculture Development in Beijing-Tianjin-Tangshan Regions
缺水地区农业灌溉用水替代与农业发展

The theoretical connotation of resources substitution based on sustainable economic development was stated. The condition and change of agricultural water consumption were analyzed using related agricultural statistic data in Beijing-Tianjin-Tangshan regions. The followings were set forth: 1) substituting irrigation water with soil water by irrigation control technologies; 2) substituting irrigation water deficit through integrating agricultural high-yield planting technologies and water-saving irrigating technologies; 3) probability in theory and actual effect of resources substitution were achieved by adjusting agricultural and planting structures. The result shows that irrigation water substitution was achieved basically in Beijing-Tianjin-Tangshan region, and agricultural water consumption was not only increased, but also decreased by adjusting agriculture structure and using advanced irrigation technologies in last twenty years. The amount of agriculture water consumption decreased from 9.71 billion cubic meter in 1980 to 6.87 billion cubic meter in 2000. The increase rate is 29.24%, and the amount of agriculture water consumption is between 7.0 and 7.5 billion cubic meter. The value added of agriculture increased from 3.06 billion RMB to 43.94 billion RMB, and increased 14.34 times. The consequence of investment for agriculture produce factors instead of investment for water resources are agriculture water consumption reduction and value added of agriculture addition. Agricultural water consumption is going to zero-increasing. And agricultural development is going to water-saving, high-effective and sustainable orientation.