水稻节水灌溉的生理生态效应研究

在可以控制水分的水泥槽中进行了两年的试验，结果表明适当的节水灌溉方式植株体内水分状态得到调节，又能延缓下位叶的衰老，增加光合作用的时间，生育后期根活力提高，协调水稻高产与根系早衰的矛盾，生殖生长干物质积累增加，有利于籽粒的形成。因此，节水灌溉方式具有增产节水的效果，本还提出了最优的节水灌溉模式。

THE PHYSIOLOGICAL AND ECOLOGICAL EFFECTS OF WATER SAVING IRRIGATION ON RICE GROWTH

Atwo-year experiment was carried out in concrete troughs which could determine andcontrol the water quantity exactly.The results showed that the proper water saving irrigationpattern can regulate the water status in the rice plants.The senescence of lower leaves de-layed and the function time of photosynthesis in repreductive stages increased.The activity ofroot system at reproductive stages raised and the contradiction between high yield and earlysenescence of roots was coordinated.The dry matter accumulation in reproductive stages wasenhanced,which favoured the grain yield development.Thus the water saving irrigation re-sulted not only in water saving but also in high yield,An optimized irrigation pattern is dis-cussed in this paper.