利用PE模型，分别模拟了水稻前中期与后期不同株型的群体光合量、蒸散量以及水分利用效率。
Using the PE Model, the canopy photosynthesis, evapotranspiration and water use efficiency (WUE) for different rice plant types were simulated.
灌溉量的增加，虽然提高了产量，却导致土壤水库中的水分不能被作物充分利用，造成了水分的无效蒸散浪费，降低了水分利用效率。
Although irrigation improved yield, crop under irrigation could not use the water of soil water reservoir. So irrigation made water waste uselessly and reduced WUE.
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