玉米冠层内不同层次对光能利用的差异性.pdfVIP

生态学杂志 Chinese Journal of Ecology 2008 ,27( 4) :551 叩556 玉米冠层内不同层次对光能利用的差异性* 林间保1. • 曲奕威I 张向香2 张慧娜I 崔国金1 (河南农业大学农学院，郑州 45(削2;2 河南省溪县农业科学研究所，河南鹤壁 456284) 摘 ;t; 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. 79昏，其冠层的中、上层吸收比例达 到 75% ;冠层不间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，不同层次的是鼻主要是与冠层内的小气候有关;非光化学拌灭系数(qN) 与叶温、光化学拌灭系数( 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里此消彼长的趋势。 关键词 玉米;冠层;光合有效辐射;光能利用 中图分类号 S513 文献标识码 A 文章编号 1∞0-4890(2008)04…0551-06 Light use efficiency in different canopy layers of Zea mays s阳nd. LIN Tong-bao 1 ; QU Yi刷 1 1 1 ( 1 wei , ZHANG T~ng-xiang2 , ZHANG Hui-na , CUI Guo才in Agronomy College 01 He nan Ag- ricultural University , Zhengzhou 450002 , China; 2Xunxian Instítute 01Agricultural Scíence , Hebi 456284 , He 阳n ， China). Chinese }ournal 01 Ecology ,2008 ,27 (3) :551 叩556. 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 en- tire canopy was 87. 7% of the total incident , and the interception rate in middle and upper layers was as much as 759毛. Within the range of visible spectra , the interception rate was in the se- quence of upper layer middle layer lower layer. The diumal variations of the three layers leaf temperature had a similar trend , and the differences among the layers were mainly related to canopy microclimate. The v