Eller B M, Willi P
Institute of Plant Biology, University of Zürich, Zollikerstr. 107, CH-8008, Zürich, Switzerland.
Oecologia. 1977 Jun;29(2):179-187. doi: 10.1007/BF00345796.
The spectral properties of juvenile and adult leaves of Tussilago farfara L. were measured for the wave range from 400 to 1350 nm. The significance of leaf pubescence for the absorption of global radiation was determined. The absorption is lowered by epidermal harrs only for the visible part of the spectrum (400-1350 nm). Absorptivities of the infrared do not vary whether hairs are present or not. The spectral properties of the upper and the lower surfaces without hairs are not equal. The hairs on the lower surface increase the amount of infrared radiation that is reflected by the upper surface. As shown by calculations of the absorbed radiation, pubescence has little influence on energy input. If leaves are put in an inverse position, the absorption of the global radiation energy is lowered by 15% compared with the same leaf in the regular position.
测定了款冬（Tussilago farfara L.）幼叶和成熟叶在400至1350纳米波长范围内的光谱特性。确定了叶毛对全球辐射吸收的重要性。仅在光谱的可见光部分（400 - 1350纳米），表皮毛会降低吸收率。有无毛时红外吸收率并无变化。无毛的上表面和下表面的光谱特性并不相同。下表面的毛增加了上表面反射的红外辐射量。通过对吸收辐射的计算表明，叶毛对能量输入影响很小。如果将叶片倒置，与正常位置的同一片叶子相比，全球辐射能量的吸收会降低15%。
