直立穗型水稻群体小气候环境研究

测定了直立穗型和弯曲穗型水稻群体的小气候环境，结果表明，直立穗群体内（１）光分布比较均匀，尤其上部光环境明显改善；（２）群体内温度高于弯曲穗群体，湿度低于弯穗群体，有利于光合效率的提高；（３）群体上部ＣＯ２浓度高于弯穗群体，中下部低于弯穗群体，说明直立穗群体部通透性好，中下部光合作用强。

Study on microclimate environment in population of erect panicle type rice

The microclimate environment in population of erect panicle type and curved panicle type rice is determined. Results showed in population of erect panicle, the effect of panicle morphology on light distribution in canopy was conspicuous, and occurred mainly in the middle and top layers of the canopy. In the canopy of population of erect panicle type, the light distribution was more unform and improvement in the up-layer. The temperature in erect panicle population was higher than that of curved panicle population and it was more humid in erect panicle population than in curved panicle population, which was favorable to the improvement of photosyhtesis efficiency. The concentration of CO 2 in the up-layer of the erect panicle population was higher than curved panicle population and it was lower than curved panicle population in the middle and bottom layers of the canopy. It was concluded that erect panicle population is well ventilated in the up-layer, and photosyntesis was strong in the middle and bottom layers of the canopy.