种植密度对夏玉米冠层光合特性的影响  

Effect of Planting Density on Canopy Photosynthesis of Summer Maize

作　　者：胡巍巍[1] 赵会杰[1] 李洪岐[2] 袁利刚[1] 赵雪娟[1] 郑静静[1] 

机构地区：[1]河南农业大学生命科学学院,河南郑州450002 [2]河南省农学会,河南郑州450001

出　　处：《河南农业科学》2013年第1期23-27,共5页Journal of Henan Agricultural Sciences

基　　金：国家粮食丰产科技工程项目(2006BAD02A07-1)

摘　　要：以夏玉米品种郑单958和浚单20为材料,研究了不同密度条件下夏玉米群体冠层辐射特征和光合特性。结果表明,郑单958玉米叶面积指数随种植密度增加而升高,两品种吐丝期叶面积指数均在82 500株/hm2处理时最高。透光率随密度增加而减小,冠层顶部透光率显著高于冠层底部。吐丝期两品种叶绿素a和叶绿素总含量表现为75 000株/hm2、82 500株/hm2处理高于67 500株/hm2、90 000株/hm2处理。穗位上第3叶Fv/Fm、qP高于穗位叶和穗位下第3叶,NPQ低于穗位叶和穗位下第3叶。随生育进程茎粗在吐丝期达到最大值,浚单20茎粗随密度增加而减小。郑单958在密度为90 000株/hm2时产量最高,为12 166.070kg/hm2,而浚单20则在82 500株/hm2时产量最高,为9 705.709kg/hm2。The summer maize cultivars Zhengdan 958 and Xundan 20 were selected to study the effects of planting densities on the photosynthesis properties of canopy with four density treatments. The results showed that LAI of Zhengdan 958 increased with the increase of planting density. The light transmission of canopy was significantly higher in upper layer than in the lower layer. The chlorophyll content in- creased with the increase of planting density at first, then decreased when the density exceeded 82 500 plants/ha. Fv/Fm and qP were higher in the third leaf above ear than those in the ear leaf and the third leaf below ear, but NPQ was converse. With the advancing of development stages, the stem diameter increased first and then decreased,reaching the maximum in silking stage. The stem diameter of Xundan 20 decreased with the increase of density. The highest yield was obtained under the density of 90 000 plants/ha for Zhengdan 958 and 82 500 plants/ha for Xundan 20,and the highest yield of two cultivars were 12 166. 070,9 705. 709 kg/ha,respectively.

关 键 词：玉米 密度 叶面积指数 透光率 叶绿素荧光参数 

分 类 号：S513[农业科学—作物学]