基于非充分灌溉理论的水稻田间水利用效率的计算方法

传统的田间水利用效率计算方法是以充分灌溉理论为基础的，据此计算的有效灌溉水量还包含有无效耗水，不能反映田间节水灌溉情况下的水分转化利用情况，存在着明显缺陷。针对这一缺陷，该文基于作物水分生产函数对作物腾发量的有效性进行了分析，进而提出了基于非充分灌溉理论的田间水利用效率的计算方法。采用该方法对水稻常规淹灌及薄露灌溉的田间水利用效率进行了分析，水稻常规淹灌的田间水利用效率为0.768，薄露灌溉为0.915，其结果也更能反映田间水分转化利用的实际情况。

Calculation method of field water use efficiency of rice based on the theory of deficit irrigation

The valid irrigation water amount, calculated by traditional method of field water use efficiency (FWUE) based on the theory of sufficient irrigation, can not reflect the water transfer and utilization in field as it includes invalid water. In this paper, the validity of evapotranspiration was analyzed according to the crop-water production function, and a new calculation method of FWUE was built based on the theory of deficit irrigation. Calculated by the new method, the FWUE of rice was 0.768 in flooding-irrigation mode, and 0.915 in Wet Irrigation mode. The result indicate a more accurate picture of water transfer and utilization in field.