Entropy budgets of deciduous plant leaves and a theorem of oscillating entropy production |
| |
Authors: | Ichiro Aoki |
| |
Institution: | (1) Department of Physics, Osaka Medical School, 2-41 Sawaragi-cho, 569 Takatsuki-shi, Osaka, Japan |
| |
Abstract: | From an energy budget of a deciduous plant leaf in moderate conditions, entropy fluxes into or out of the leaf due to solar
radiation, infrared radiation, evaporation of water and heat conduction are calculated. Net entropy flow into the leaf is
negative. On the assumption that the entropy in the leaf is in a steady state, the entropy production in the typical deciduous
leaf in moderate conditions the solar energy absorbed by both sides of the leaf isE
solar=0.0602 (J cm−2 s−1)] becomesS
prod=1.8×10−4 (J cm−2 s−1 K−1). The positiveness of the entropy production shows that the Second Law of Thermodynamics certainly holds in the plant leaf.
Entropy productions in other conditions are also calculated. The entropy production in the leafS
prod becomes a linear function of the solar energy absorbed by the leafE
solar:S
prod≈-(29.5E
solar)×10−4. A theorem is presented: the entropy production in plant leaves oscillates during the period of one day, paralleling the
daily solar energy absorbed by leaves. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|