作物学报 ›› 2017, Vol. 43 ›› Issue (06): 925-934.doi: 10.3724/SP.J.1006.2017.00925
郑宾,赵伟,徐铮,高大鹏,姜媛媛,刘鹏,李增嘉,李耕*,宁堂原*
ZHENG Bin,ZHAO Wei,XU Zheng,GAO Da-Peng,JIANG Yuan-Yuan,LIU Peng,LI Zeng-Jia,LI Geng*,NING Tang-Yuan*
摘要:
为了探讨不同耕作方式与氮肥类型对夏玉米光合性能的影响及其作用机制,本试验以玉米杂交种郑单958为供试材料,通过快速叶绿素荧光诱导动力学曲线(OJIP)及820 nm光吸收等技术,深入研究了玉米叶片花后叶绿素含量、含氮量、气体交换参数、光系统II (PSII)、光系统I (PSI)及二者间的协调性。两年研究结果表明,与常规尿素相比,施用控释尿素均可显著提高玉米花后穗位叶叶绿素含量、净光合速率(Pn)及后期气孔导度(Gs),明显改善光系统间协调性。与旋耕相比,深松可进一步加强施氮对玉米叶片光合性能的促进作用。控释尿素结合深松可显著提高叶绿素含量及Pn,明显改善叶片PSII反应中心供体侧和受体侧性能,增强电子由PSII向PSI的传递,使花后叶片PSII与PSI间协调性显著增加,有利于产量形成期光合性能稳定。光合性能的提高显著增加了穗粒数和单株籽粒产量,最终提高玉米产量。因此,深松与控释尿素结合可有效地协调PSII与PSI,提高夏玉米光合性能,促进玉米增产。
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