【作者】 孙红春； 冯丽肖； 谢志霞； 李存东；

【机构】 河北农业大学农学院；

【摘要】 以转基因抗虫杂交棉中棉所29（CCRI219）为材料,在田间进行不同氮肥水平(高氮:225.0kg·hm^-2:中氮:112.5kg·hm^-2;低氮:0kg·hm^-2)试验,较为系统地研究了 CCRI29 中、下部铃--叶系统生理特性及铃重的空间分布。结果表明:不同氮肥水平对棉花的生长发育有一定调节效应。（1）与中氮、低氮相比,高氮促进了后期果枝叶中叶绿素的含量,延长了叶片功能期。（2）不同氮肥水平对棉花各个器官中碳水化合物代谢有重要影响,低氮促进了果枝叶中碳水化合物的积累,中氮水平下碳水化合物代谢较为协调。（3）施入氮肥可以增加 POD、SOD 酶活性。下部棉铃对位叶中各处理间比较:中氮＞高氮＞低氮,而中部棉铃对位叶各处理间顺序为高氮＞中氮＞低氮。更多还原

【Abstract】 With Bt-transgenic hybrid cotton variety CCRI29 as material,the study on effects by applying different level of nitrogen fertilizer(225.0kg·hm^-2,high;112.5kg·hm^-2,middle; 0kg·hm^-2,low)in the field in 2002-2003.The plant density is about 53336/hm².The main results are as follows:（1）The results showed that changing nitrogen application amount had some effects on cotton growth and development.Compared with mid-nitrogen and low-nitrogen,high-nitrogen promoted chlorophyll accumulating in leaf growth anaphase on fruit branch,which extended leaf function period.The dissoluble protein content of leaf was the lowest under the treatment of low-nitrogen,and the chlorophyll content decreased rapidly in leaf growth anaphase,which accelerated the leaf’s senescence.（2）Different nitrogen level affected the carbohydrate metabolism in various organs of cotton plant evidently.The carbohydrate synthesis was inhibited under high-nitrogen level,but low-nitrogen level promoted carbohydrate accumulation in leaf on reproductive branch.Different nitrogen levels had no significant effect on carbohydrate concentration in seed cotton.（3）Nitrogen can enhanced activity of SOD and POD to some extent. The order of their activity of leaf born around June 1 was mid-nitrogen＞high-nitrogen＞ low-nitrogen,but the order of leaf activity born around June 22 was high-nitrogen＞mid-nitrogen ＞low-nitrogen.更多还原