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玉米冠层内不同层次对光能利用的差异性

林同保1;曲奕威1;张同香2;张慧娜1;崔国金1   

  1. 1河南农业大学农学院, 郑州 450002;2河南省浚县农业科学研究所, 河南鹤壁 456284
  • 收稿日期:2007-05-29 修回日期:1900-01-01 出版日期:2008-04-10 发布日期:2008-04-10

Light use efficiency in different canopy layers of Zea mays stand.

LIN Tong-bao1;QU Yi-wei1;ZHANG Tong-xiang2;ZHANG Hui-na1;CUI Guo-jin1   

  1. 1Agronomy College of He’nan Agricultural University, Zhengzhou 450002, China;2Xunxian Institute of Agricultural Science, Hebi 456284, He’nan, China
  • Received:2007-05-29 Revised:1900-01-01 Online:2008-04-10 Published:2008-04-10

摘要: 将玉米冠层分为上、中、下3个层次,分析其不同层次对光能利用的规律。结果表明:整个冠层吸收的光合有效辐射(PAR)占总入射的87.7%,其冠层的中、上层吸收比例达到75%;冠层不同层次在可见光范围内的吸收率是上层>中层>下层;上、中、下3层叶温日变化规律一致,不同层次的差异主要是与冠层内的小气候有关;非光化学猝灭系数(qN)与叶温、光化学猝灭系数(qP)与光合速率(Pn)的变化趋势一致;用于光化学反应的能量与用于热能转化的能量呈此消彼长的趋势。

关键词: 亚高山针叶林, 生态学过程, 人工恢复, 物种多样性, 云杉

Abstract: The study on the light use efficiency in the upper, middle, and lower canopy layers of Zea mays stand showed that the photosynthetically active radiation (PAR) intercepted by the entire canopy was 87.7% of the total incident, and the interception rate in middle and upper layers was as much as 75%. Within the range of visible spectra, the interception rate was in the sequence of upper layer>middle layer>lower layer. The diurnal variations of the three layers leaf temperature had a similar trend, and the differences among the layers were mainly related to canopy microclimate. The variations of non-photochemical quenching coefficient (qN) were in accordance with those of leaf temperature, photochemical quenching coefficient (qP), and photosynthetic rate (Pn). There was a trade-off tendency between the energies used for photochemical reactions and heat transformation.

Key words: Subalpine coniferous forest, Ecological process, Artificial restoration, Species diversity, Picea asperata