DRAINMOD和HYDRUS-1D模型对水稻控制灌排条件下农田水位的模拟

为研究水稻控制灌排条件下农田水位的变化，根据2017年的水稻测坑种植试验资料，率定DRAINMOD模型和HYDRUS-1D模型参数，以相关系数、平均偏差及纳什效率系数为评价标准，通过比较2018年农田水位模拟值与实测值的吻合程度，分析2种模型模拟稻田干湿交替条件下农田水位的可靠性。结果表明:DRAINMOD模型和HYDRUS-1D模型的模拟结果均能较好地反映农田水位的实际变化情况，模拟值与实测值的相关系数分别为0.778和0.849，平均偏差分别为2.051 cm和1.809 cm，纳什效率系数分别为0.509和0.360，且2个模型模拟结果没有显著差别；DRAINMOD模型和HYDRUS-1D模型均可用于模拟水稻控制灌排条件下农田水位变化，为稻田水分运移研究提供方便可行的方法。

Simulations on water level of farmland under controlled irrigation and drainage of rice based on DRAINMOD and HYDRUS-1D Models

In order to study the change of water level of rice farmland under controlled irrigation and drainage mode, the parameters of DRAINMOD model and HYDRUS-1D model were determined based on the planting test data of rice pit in 2017, and the correlation coefficient, average deviation and efficiency coefficient were used as the reference evaluation criteria. Comparing the simulated values of farmland water level with the measured values in 2018, the reliability of two models to simulate farmland water level was analyzed. The results show that both the simulation results of DRAINMOD model and HYDRUS-1D model can reflect the actual changes of farmland water level. Correlation coefficients between simulated and measured values are 0. 778 and 0. 849, the average deviations are 2. 051 cm and 1. 809 cm, and the Nash efficiency coefficients are 0. 509 and 0. 360, respectively. There is no significant difference between the simulation results of two models. Both DRAINMOD model and HYDRUS-1D model can be used to simulate the change of water level in rice field under controlled irrigation and drainage, and this conclusion provides a convenient and feasible method for the study of water transport in rice field.