北疆棉花群体光合特性研究

北疆主要棉花品种光合性能的差异主要表现在棉花生育后期，吐絮期群体光合速率（CAP）与产量呈正相关。盛花期～吐絮期，冠层中的上、中、下层CAP变化具有一定的规律，吐絮期冠层上层作为棉株C的主要来源。棉花CAP与光密度通量（PFD）呈极显著正相关。

Study on Cotton Canopy Photosynthesis Characteristics in the North of Xinjiang

Experiment of studying on canopy photosynthesis characteristics were carried out in 1998 under conditions of field experiment at Xinjiang Crop High Yield Research Center, Shihhotze University.The main results are summarized as follows:The diurnal variations of net canopy apparent photosynthesis rate (CAP) was a single peak curve during the day and in all cotton's growth days such as bud stage, blossom and open boll stage. CAP was positively correlated with Photon Flux Density (PFD).Canopy structure is divided into three layers: top, middle and lower layers respectively, from full blossom stage to open boll stage. CAP contributes to C source, which at the first comes from the lower layer, then middle layer, at last top layer.In open boll stage, cotton lint yield is positively correlated with CAP.