南疆棉花群体光分布与光合速率研究初报

Study on Light Distribution and Photosynthesis Rate in Cotton Community in South Xinjiang

对棉花群体光分布的初步研究结果表明，棉田随叶面积指数的增大，群体透光率降低；叶面积指数相同或相近时，东西播向群体透光率高于南北播向。不同叶位叶光合速率以倒３至倒７叶较高，倒５叶最高。功能叶片光合速率在一天中的变化呈双峰曲线，第一个峰在１２：００左右，第二个峰在１８：００左右。

The preliminary study on light distribution in cotton community indicates that leaf area index increases.When having the same leaf area index,community of westeast sowing has highter penetrating rate than that of northsouth sowing.Photosynthesis rate is higher on leaf from last third to last seven position.The change of photosynthesis rate in function leaf in a day shows double peak curre.The first peak shows up about 12:00 AM.The second pesk appears round about 6:00 PM.