氮水平对水稻汕优64和金南风光合特性的影响

 以缺氮、低氮、中氮、高氮、超高氮盆栽土培的汕优64和金南风为材料，测定植株和叶片的生长状况、叶片总N含量、光合速率、光呼吸速率、气孔导度和叶肉导度的变化。结果表明，供试两品种随着施N量的增加，植株的分蘖数增多,株高增加,气孔密度减少, 叶片总N含量、叶绿素含量、光呼吸速率、叶肉导度等均增加。供试两品种的净光合速率变化存在差异，金南风叶片的净光合速率随着施N量的增加而增加,但汕优64在高氮和超高氮的条件下净光合速率反而下降,说明在高氮和超高氮的条件下光氧化环增加的幅度大于光合还原环。

Effect of Nitrogen Levels on Photosynthetic Characteristics of Rice Variety (Combination) Shanyou 64 and Kinmaze

Pot culture of lack nitrogen(ON, control),low nitrogen(LN),medium nitrogen (MN), high nitrogen(HN) and super high nitrogen(SN) was conducted to investigate the growth of plants and leaves, total N content of leaves, chlorophyll content, photosynthetic rate, photorespiratory rate, stomatal and mesophyll conductance in hybrid rice Shanyou 64 and conventional rice Kinmaze. Results showed that the tiller number and height of plants,total N content of leaves, chlorophyll content, photorespiratory rate, mesophyll conductance raised as increasing nitrogen levels, but stomatal density decreased. Shanyou 64 and Kinmaze had different changing trends in net photosynthetic rate. Net photosynthetic rate of Kinmaze raised as increasing nitrogen levels, but that of Shanyou 64 decreased under HN and SN levels. The increase of photosynthetic oxidative cycle was more than that of photosynthetic reduced cycle under HN and SN levels in both varieties.