氮素对12个大豆品种叶片光合生理参数的影响

Effect of Nitrogen on Photosynthetic Traits of 12 Soybeans Varieties

在大田条件下,以不同来源12个亚有限结荚习性大豆品种为材料,采用不同氮素用量,利用LI-6400光合作用测定系统在大豆开花期、结荚期、鼓粒期测定了大豆叶片净光合速率、蒸腾速率、气孔导度和细胞间隙二氧化碳浓度,以确定大豆的氮素合理施用量。结果表明:当尿素施用量为100 kg/hm2时,与不施肥相比,俄亥俄当代品种和辽宁当代品种开花期与结荚期叶片净光合速率增加;随着施氮量的增加,辽宁老品种开花期叶片净光合速率逐渐增加。与不施肥相比,氮肥处理增加了俄亥俄当代品种和辽宁当代品种鼓粒期叶片净光合速率。

This experiment was carried out by using twelve soybean cultivars from different regions in field conditions. We measured photosynthetic traits using LI-6400 photosynthesis system at blooming,podding and grain filling stage in the treatment of nitrogen fertilizer. The results were as follows： the leaf net photosynthesis rate was improved in the treatment of 100 kg / hm^2 urea for current Ohio cultivar and current Liaoning cultivar at blooming and podding stages. The leaf net photosynthesis rate of old Liaoning cultivarincreased with the level of nitrogen fertilizer ascending at blooming stage. The leaf net photosynthesis rate was improved in the treatment of nitrogen fertilizer for current Ohio cultivar and current Liaoning cultivar at grain filling stage.