摘要
在不同施氮量和施氮时期条件下对夏玉米冠层结构及光合速率进行研究。结果表明,对于不同施氮量和施氮时期,夏玉米冠层内不同部位叶向值表现为上层>中层>下层。基施氮180kg/hm2的处理各层叶向值均大于其他处理;拔节期施氮75kg/hm2的处理各层叶向值表现最大。各处理冠层内光合速率以上层>中层>下层,在吐丝期达最大值;在吐丝期表现为基施氮180kg/hm2处理>拔节期施氮180kg/hm2处理>大喇叭口期施氮180kg/hm2处理;拔节期施氮75kg/hm2处理>基施氮75kg/hm2处理>大喇叭口期施氮75kg/hm2处理;到灌浆中期基施氮180kg/hm2处理下降程度大于其他处理。对光合速率和叶向值进行相关性分析表明,吐丝期光合速率与叶向值呈正相关关系。
Under different nitrogen supply rate and different fertilize times, the structure of summer maize and photosynthetic rate was studied. The results showed that leaf oriented value（LOV） were higher in upper layer than middle layer and than under layer, as to the treatments of nitrogen supply 180 kg/ha fertilizing in the seedtime had higher LOV than other treatment ,but for the treatments of nitrogen supply 75 kg/ha fertilizing in the jointing stage had higher LOV. In the canopy, Pn was higher in the upper layer than middle layer and under layer and got to maximum in the silking stage. In the silking stage, Pn of different treatments represented that N180A 〉 N180B 〉 180C, N75B 〉 N75A 〉 N75C in every layer. In the filling stage, Pn of N180A degreased quickly than other two treatments. The relative analysis of Pn and LOV showed that Pn was closely related to the LOV in the silking stage.
出处
《玉米科学》
CAS
CSCD
北大核心
2009年第2期133-135,共3页
Journal of Maize Sciences
关键词
夏玉米
氮肥
冠层结构
光合速率
Summer maize
Nitrogen
Canopy structure
Photosynthetic rate（Pn）
