基于WIN ISAREG模型的青贮玉米灌溉制度优化研究

为了探索锡林河流域青贮玉米高效节水的最优灌溉制度,进行了连续2年的田间灌溉试验,研究了滴灌条件下青贮玉米的灌溉制度。研究表明,青贮玉米在拔节期-抽雄期土壤水消耗比率最低,作物系数、产量反应系数和腾发量在整个生育期内均达到最大,为青贮玉米的需水关键期;在田间试验的基础上,利用WIN ISAREG模型对实际灌溉制度进行了评价,并模拟了多种组合方案,得到了青贮玉米优选的灌溉制度,青贮玉米生育期内共灌水8次,灌水量200 mm,产量下降率为5.6%,灌水效率达到100%。研究结果可为流域内的青贮玉米灌溉预报,以及有效的利用当地水资源提供参考。

Optimization of Irrigation System of Ensile Maize by WIN ISAREG Model

In order to research the efficient water-saving irrigation system of ensile maize in Xilin River Basin, different irrigation experiments have been carried out for two consecutive years, and the irrigation system of ensile maize under drip irrigation was studied. The results showed that, the soil water consumption rate was the lowest from the jointing stage to the tasseling stage; crop coefficient, yield response coefficient and evapotranspiration were the highest from the shooting phase to tasseling stage, which was the critical period of water requirement of ensile maize. Based on the field experiment, WIN ISAREG was used to appraise the actual irrigation system, simulated a variety of combination plans, and the optimization irrigation system was obtained. Ensile maize field was irrigated eight times during the plant growth period, and the irrigation quantity was 200 mm, the rate of yield decline was 5.6% , and irrigation efficiency reached 100% . The results can provide a reference for effective utilization of water resources and irrigation forecast in Xilin River Basin.