大豆和玉米冠层光合有效辐射各分量日变化

被引：18

作者：

杨飞

张柏

李凤秀

国志兴

靳华安

机构：

[1] 中国科学院东北地理与农业生态研究所

来源：

生态学杂志 | 2007年 / 08期

关键词：

大豆; 玉米; 光合有效辐射; 反射率; 透射率; 偏离度;

D O I：

10.13292/j.1000-4890.2007.0206

中图分类号：

Q945 [植物生理学];

学科分类号：

0903 ;

摘要：

通过实测大豆和玉米冠层光合有效辐射各分量并计算其反射率、透射率,分析了各分量日变化规律及其影响因素。结果表明:光合有效辐射分量(FPAR)在一天中均接近于常数,特别是在8:00—11:00和14:00—16:00相对稳定;晴天大豆冠层入射光合有效辐射变化曲线较阴天平滑,反射率和透射率曲线没有阴天平滑;由于云层的吸收和散射作用,阴天中光合有效辐射(PAR)最大值的出现时间比晴天晚1h左右;植被冠层空间异质性对光合有效辐射各分量影响较大,不同作物类型的各分量之间有较大差异;大豆冠层空间异质性较玉米小,其光合有效辐射各个分量曲线较平滑;线性光量子传感器与太阳入射方向垂直投影线成30°时,冠层入射光合有效辐射平均偏离度值最小,为0.657%。

引用

页码：1153 / 1158

页数：6

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