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根据农田土壤水分平衡原理 ,综合应用詹森 -海斯公式和缺水条件下的作物蒸散计算公式 ,模拟了旱地地膜穴播春小麦的土壤水分变化状况。模拟结果令人满意 ,其相对误差小于 5 % ,可用于旱地地膜春小麦的土壤水分监测和指导补充灌溉。同时 ,用非线性回归技术计算了旱地地膜穴播春小麦的水分敏感系数。结果表明 ,旱地地膜穴播春小麦的播种 -出苗 ,出苗 -拔节 ,拔节 -抽穗 ,抽穗 -扬花和扬花 -成熟期的水分敏感系数分别为- 0 .2 318,0 .0 5 94 ,0 .770 9,0 .32 96和 0 .0 181,说明拔节 -抽穗期是旱地地膜穴播春小麦补灌的有利时期
According to the principle of soil moisture balance in farmland, this paper simulates the change of soil moisture in dry-land mulching with spring wheat by using the Jensen-Hayes formula and crop evapotranspiration formula. The simulation results are satisfactory. The relative error is less than 5%, which can be used to monitor the soil moisture of dryland mulching spring wheat and to guide the irrigation. At the same time, the water sensitivity coefficient of dry-land mulching spring wheat was calculated by nonlinear regression. The results showed that the water sensitivity coefficients of spring wheat in field mulching with spring mulching - emergence, emergence - jointing, jointing - heading, heading - flowering and flowering - maturing were -0.22 318,0 .0 5 94,0.770 9 , 0 .32 96 and 0 .0 181, indicating that the jointing-heading stage is the favorable period of irrigating spring mulch in spring