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Regulating Effects of Density and Top- dressing Time of Nitrogen on Characteristics of Radiation Transmission and Photosynthesis in Canopy of Massive-spike Winter Wheat Variety L906

密度和追肥时期对重穗型冬小麦品种L906群体辐射和光合特性的调控效应



全 文 :第28卷 第2期 作 物 学 报 V ol. 28, N o. 2
2002 年3月  270~ 277页 A CTA A GRONOM ICA S IN ICA pp. 270~ 277 M ar. , 2002
密度和追肥时期对重穗型冬小麦品种L 906群体辐射和光合特性的调控
效应
赵会杰1 邹 琦2, 3  郭天财3 于振文2 王永华3
(1河南农业大学农学院, 河南郑州450002; 2山东农业大学生命科学学院, 山东泰安271018; 3国家小麦工程技术研究中心, 河南郑州 450002)
摘 要 密度和追肥时期对重穗型高产冬小麦的群体发展, 冠层辐射和光合特性有明显的调节效应。随着密度增加, 开
花前的叶面积指数 (LA I)、群体净光合速率 (N CP)、群体叶源量 (CL SC) 提高, 但生育后期衰减较快; 密度过高导致群体
透光率下降, 消光系数增加, 单茎受光量降低, 冠层光环境恶化, 后期旗叶的羧化效率降低; 密度过低则导致生育前期漏
光损失较多。在采取适宜密度的基础上, 推迟追肥时期, 可改善小麦生育后期群体的光环境和光合特性, 有效地协调重穗
型小麦的源库关系, 提高籽粒产量和光能利用率。
关键词 小麦; 重穗型; 密度; 追肥时期; 群体光合特性
中图分类号: S512   文献标识码: A
Regula ting Effects of D en sity and Top - dressing Time of N itrogen on
Character istics of Radia tion Tran sm ission and Photosyn thesis in Canopy of
M a ssive- sp ike W in ter W hea t Var iety L 906
ZHAO H ui- J ie1 ZOU Q i2 GUO T ian- Cai3 YU Zhen- W en2 WAN G Yong- H ua3
(1 College of A g ronom y , H enan A g ricultural U niversity , Z hengzhou 450002; 2 S hand ong A g ricultural U niversity , T aian 271018; 3 N ational R esearch
Center f or E ng ineering and T echnology of W heat, Z hengx hou 450002, China)
Abstract R egulating effects of p lan ting density and top - dressing tim e of n itrogen on characteristics of
radiation transm ission and pho tosyn thesis in canopy of m assive- sp ike w in ter w heat variety L 906 w as studied.
T he results show ed that, as the increm en t of density, the population leaf area index (LA I) , net canopy
pho tosyn thetic rate (N CP) and canopy leaf source capacity (CL SC ) increased befo re an thesis, but decreased
quick ly during grainfilling. T he population w ith h igher density resulted in decrease of ligh t transm ission,
pho tosyn thetically activeradiation received by per stem and carboxylic efficiency of flag leaf, and increase of
ligh t ex tinction coefficien t and deterio ration of ligh t condition in canopy. L ow density population caused loss of
ligh t during earlier stage. A nd suitable density com bined w ith postpon ing top - dressing of n itrogen could
coordinate the relationsh ip betw een source and sink, increase grain yield and ligh t utilization efficiency of
m assive2sp ike w heat.
Key words  W heat; M assive2sp ike; D ensity; Top2dressing tim e of n itrogen; Population pho tosyn thetic
characteristics

1722期     赵会杰等: 密度和追肥时期对重穗型冬小麦品种L 906群体辐射和光合特性的调控效应     

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3722期     赵会杰等: 密度和追肥时期对重穗型冬小麦品种L 906群体辐射和光合特性的调控效应     

472                     作  物   学  报                    28卷

5722期     赵会杰等: 密度和追肥时期对重穗型冬小麦品种L 906群体辐射和光合特性的调控效应     

672                     作  物   学  报                    28卷

7722期     赵会杰等: 密度和追肥时期对重穗型冬小麦品种L 906群体辐射和光合特性的调控效应