| Summary: | 碩士 === 國立嘉義大學 === 土木與水資源工程學系研究所 === 105 === Food security is the cornerstone of national development. While the extreme weather occures frequently and intensely at this stage, food security is highly concerned. The activation of redeployed cropping pattern could not only increase the self-sufficiency rate of grain production, but also maintain the sustainable use of field and control of ground subsidencd. Therefore, it is an important issue to evaluate the crop type of redeployed cropping pattern, and thereby to enhance the efficiency of irrigation water in golden agricultural corrido.
In this reserch, the water resources production indicator is adopted to evaluate the activation of transfer plant. The area of golden agricultural corrido is selected to be the main research region due to the most percentage of transfer plant. The policy crop (corn, wheat, soybean, and sorghum) and the economy crops (potato, broccoli, and cabbage) are studied as the transfer activation crops.
The amounts of the crop water requirement, the irrigation water and the irrigation water use efficiency are considered in transfer activation.
The research results show that the irrigation areas 4000 hectar of paddy field and accumulated paddy irrigation water in golden agricultural corridor is about 64.62 million m3. As the simulated water usage under the 80% paddy field of redeployed cropping pattern, the volume of saved water were 48.15 million m3 and 48.2 million m3 under policy crops and economy crops. As the simulated water usage under the 100% paddy field of redeployed cropping pattern, the volume of saved water were 60.2 million m3 and 60.23 million tons under policy crops and economy crops. And the cropping pattern of selected suitable crops in second season paddy rice is better than that of first season paddy rice.
The irrigation efficiencies of the paddy rice, policy crops and economy crops are 17~20 NT dollars/m³, 31~979 NT dollars/m³ and 196~5,172 NT dollars /m³ respectively in golden agricultural corrido. With these results, it is concluded that the irrigation efficiency of economy crops is higher than that of the paddy rice and policy crops. The cropping pattenn can be used to enhance irrigation management and water-saving benefit, improve agricultural production, farmers ' income and reduction of ground subsidence. These suggestions can serve as the foundation for the irrigation bureau to implement a feasible irrigation ration policy.
|
|---|
