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作物学报 ›› 2022, Vol. 48 ›› Issue (12): 3179-3191.doi: 10.3724/SP.J.1006.2022.13073

所属专题: 玉米:耕作栽培·生理生化

• 耕作栽培·生理生化 • 上一篇    下一篇

玉米耐高密品种冠层光氮分布及匹配特征研究

王梦(), 周光远(), 高聚林(), 于晓芳, 孙继颖, 胡树平, 青格尔, 屈佳伟, 马达灵, 王志刚()   

  1. 内蒙古农业大学农学院, 内蒙古呼和浩特 010019
  • 收稿日期:2021-12-09 接受日期:2022-05-05 出版日期:2022-12-12 网络出版日期:2022-05-10
  • 通讯作者: 高聚林,王志刚
  • 作者简介:王梦, E-mail: imauwangmeng@163.com;
    周光远, E-mail: imauzgy960125@163.com第一联系人:

    **同等贡献

  • 基金资助:
    国家自然科学基金项目(32160507);内蒙古自治区科技重大专项(2021SZD0012)

Distribution and matching characteristics of light and nitrogen in maize canopy of high-density tolerance varieties

WANG Meng(), ZHOU Guang-Yuan(), GAO Ju-Lin(), YU Xiao-Fang, SUN Ji-Ying, HU Shu-Ping, QING Ge-Er, QU Jia-Wei, MA Da-Ling, WANG Zhi-Gang()   

  1. College of Agronomy, Inner Mongolia Agricultural University, Hohhot 010019, Inner Mongolia, China
  • Received:2021-12-09 Accepted:2022-05-05 Published:2022-12-12 Published online:2022-05-10
  • Contact: GAO Ju-Lin,WANG Zhi-Gang
  • About author:First author contact:

    **Contributed equally to this work

  • Supported by:
    National Natural Science Foundation of China(32160507);Major Science and Technology Project of Inner Mongolia(2021SZD0012)

摘要:

在有限氮投入下通过增密种植实现玉米增产增效, 需要进一步挖掘耐密品种的光氮匹配利用潜力。揭示不同耐密品种冠层光氮空间分布和匹配特征差异, 及其与玉米产量形成及氮效率的关系, 对探索玉米产量效率层次差异消减途径具有指导意义。本试验以常规品种KH8和耐高密品种MC670为试验材料, 在减氮增密条件下, 系统分析了常规和耐密型玉米品种冠层光氮分布及匹配特征的差异。结果表明, 耐高密品种MC670穗位以上透光率较常规品种KH8高20.6%。两品种的比叶氮(specific leaf nitrogen, SLN)均表现为上层叶片、中层叶片显著高于下层叶片; MC670上层、中层叶片SLN显著高于KH8, 但下层叶片差异不显著。KH8和MC670的光氮匹配系数分别为1.28和0.86, MC670的光氮匹配系数与理想值差异较小, 说明MC670的光氮匹配程度优于KH8。综上所述, 与常规品种KH8相比, 耐高密品种MC670冠层具有较低的消光系数和较高的氮消减系数, 使耐高密品种冠层具有较优的光氮匹配程度, 同时使其中上部冠层具有更高的光合氮比例、光合氮效率和光合生产力, 这是其实现较高的氮肥生理效率、氮肥利用效率及获得高产的重要生理内因。

关键词: 玉米, 冠层, 光氮匹配, 氮效率

Abstract:

To increase maize yield and efficiency through high-density planting with limited nitrogen input, it is necessary to further explore the potential of light-nitrogen matching utilization of dense-tolerant varieties. Revealing the spatial distribution and matching characteristics of light and nitrogen in canopy in canopy of different density-tolerant varieties, and their relationship with maize yield formation and nitrogen efficiency, is of guiding significance for exploring the reduction of maize yield and efficiency hierarchy differences. In this experiment, the conventional variety KH8 and the high-density tolerant variety MC670 were used as the experimental materials. The planting density was set at 82,500 plants hm-2 and the nitrogen application rate was 150 kg hm-2, systematic analysis of the different varieties of dense canopy light resistant nitrogen differences in spatial distribution and matching characteristics. The results showed that the transmittance of MC670 was 20.6% significantly higher than that of KH8. SLN (specific leaf nitrogen) of upper and middle leaves was significantly higher than that of lower leaves in both cultivars. The SLN of upper and middle leaves of MC670 was significantly higher than that of KH8, but the difference of lower leaves was not significant. The matching coefficients of light and nitrogen for KH8 and MC670 were 1.28 and 0.86, respectively. The difference between the matching coefficients of light and nitrogen for MC670 and the ideal value was small, indicating that the matching degree of light and nitrogen for MC670 was better than KH8. In conclusion, compared with the conventional varieties KH8, the canopy of high-density resistant varieties MC670 had lower extinction coefficient and higher nitrogen reduction coefficient, which made the canopy of high-density resistant varieties had a better light nitrogen matching degree. Meanwhile, the middle and upper canopy had higher ratio of light and nitrogen, photosynthetic productivity, and photosynthetic nitrogen ratio. This is an important physiological factor to achieve higher nitrogen physiological efficiency, nitrogen use efficiency and high yield.

Key words: maize, canopy, photo-nitrogen matching, nitrogen use efficiency

图1

叶片生物量及氮素测量的叶片分层(左)及冠层PAR测量时冠层分层示意图"

图2

常规和耐密玉米品种冠层光分布比较 不同字母表示处理间差异达到0.05显著水平; 箭头指示穗位叶高度。"

图3

常规和耐密玉米品种冠层透光率(I/I0)比较 不同字母表示处理间差异达到0.05显著水平; 箭头指示穗位叶高度。"

图4

常规和耐密玉米品种冠层不同层次叶面积差异 不同字母表示处理间差异达到0.05显著水平。"

图5

常规和耐密玉米品种冠层PAR随累积LAI的变化规律 不同字母表示处理间差异达到0.05显著水平。"

图6

常规和耐密玉米品种冠层比叶氮分布比较 不同字母表示处理间差异达到0.05显著水平。"

图7

常规和耐密玉米品种冠层比叶氮与累积LAI的关系 不同字母表示处理间差异达到0.05显著水平。"

图8

常规和耐密玉米品种冠层比叶氮与相对累积叶面积指数的关系 不同字母表示处理间差异达到0.05显著水平。"

图9

常规和耐密玉米品种冠层比叶氮随冠层PAR变化规律 不同字母表示处理间差异达到0.05显著水平。"

表1

常规和耐密玉米品种光氮匹配程度比较"

年份
Year
品种
Cultivar
光分布模型
Light distribution model
R2 KL 氮分布模型
Nitrogen distribution model
R2 Kb KL/Kb
2018 KH8 Y=1614.64×e-0.4380X 0.9727 0.438 Y=2.58×e-0.3304X 0.9938 0.3304 1.326
MC670 Y=1728.80×e-0.4180X 0.9714 0.418 Y=3.26×e-0.5049X 0.9908 0.5049 0.828
2019 KH8 Y=1638.65×e-0.4820X 0.9954 0.482 Y=2.61×e-0.3897X 0.9703 0.3897 1.237
MC670 Y=1731.95×e-0.4480X 0.9801 0.448 Y=3.24×e-0.5054X 0.9678 0.5054 0.886

图10

常规和耐密玉米品种叶片净光合速率比较 不同字母表示处理间差异达到0.05显著水平。"

图11

常规和耐密玉米品种冠层光合氮效率比较 不同字母表示处理间差异达到0.05显著水平。"

图12

常规和耐密玉米品种冠层光合生产力比较 不同字母表示处理间差异达到0.05显著水平。"

图13

常规和耐密玉米品种叶片干物质积累量比较 不同字母表示处理间差异达到0.05显著水平。"

表2

常规和耐密玉米品种吐丝期叶片氮积累量及氮组分分析"

叶片层位
Leaf level
氮积累量
Nitrogen accumulation
光合氮积累量
Photosynthetic nitrogen
accumulation
基质氮积累量
Substrate nitrogen
accumulation
结构氮积累量
Structural nitrogen
accumulation
KH8 MC670 KH8 MC670 KH8 MC670 KH8 MC670
上层叶片
Upper leaf
39.2 Aa
38.2 Aa
13.4 Aa
14.5 Aa
12.7 Aa
13.1 Aa
12.9 Aa
10.8 Ba
中层叶片
Middle leaf
33.8 Bb
40.3 Aa
11.3 Bb
14.9 Aa
10.6 Bb
12.9 Aa
11.8 Aa
12.5 Aa
下层叶片
Lower leaf
20.7 Bc
29.9 Ab
6.1 Bc
9.6 Ab
6.2 Bc
8.9 Ab
8.4 Bc
11.3 Aa

图14

常规和耐密玉米品种叶片氮组分占叶片总氮的百分比 不同字母表示处理间差异达到0.05显著水平。"

表3

常规和耐密玉米品种产量及氮效率比较"

年份
Year
品种
Cultivar
产量
Grain yield
(t hm-2)
氮肥利用效率
N use efficiency
(kg kg-1)
氮肥生理效率
N internal efficiency
(kg kg-1)
氮肥吸收效率
N recovery efficiency
(kg kg-1)
2018 KH8 14.30 b 8.27 b 39.36 b 0.21 a
MC670 15.90 a 13.33 a 51.28 a 0.26 a
2019 KH8 13.24 b 8.67 b 31.73 b 0.27 a
MC670 14.90 a 12.93 a 45.19 a 0.29 a
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