论文部分内容阅读
依据蒸渗仪试验资料,分析了稻田灌排耦合调控下水稻需水量变化规律。结果表明,灌排耦合模式的水稻全生育期需水量变化差异显著(p<0.05)。与浅湿灌溉+大田地下水埋深模式相比较,控制灌溉+适宜地下水埋深的水稻需水量减少25.3%,控制灌溉+控制地下水埋深模式的水稻需水量减少34.4%;灌排耦合模式的水稻阶段需水强度均有不同程度下降,以拔节孕穗期和分蘖中期降低幅度较明显;需水量模比系数呈前期小、中期大、后期又小的变化规律。不同地下水埋深对水稻需水量变化的影响未达到显著水平,以控制灌溉+控制地下水埋深模式水稻全生育期需水量较小。
Based on the data of lysimeter, the variation of water requirement of paddy under the control of irrigation and drainage was analyzed. The results showed that there was significant difference (p <0.05) in water requirement during the whole growth period of rice with irrigation-drainage coupled mode. Compared with the pattern of shallow wetland irrigation and field groundwater depth, the water requirement of paddy with controlled irrigation + suitable groundwater depth was reduced by 25.3%, the water requirement of paddy with controlled irrigation + groundwater depth control mode was reduced by 34.4% The water requirement decreased in different stages, especially in the stage of jointing booting and middle tillering stage. The water requirement modulus ratio was small in the early stage, large in the middle stage and small in the late stage. The effect of different groundwater depth on the change of rice water requirement did not reach significant level. In order to control irrigation and control groundwater depth, the water demand during the whole growth period of rice was small.