By L. T. Evans
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By G a a s t r a , 1959) and some aerodynamic consideration of them has been carried out by Raschke (1960) in applying boundary-layer theories. I n the t r e a t m e n t of Raschke t h e h e a t flux transferred from leaves to the adjacent air, for example, is represented by Q M0,eaf- #air) (8) 3 . The Environment of Plant Surfaces 29 whereh is called t h e h e a t - t r a n s f e r coefficient. T h e diffusion resistance is then defined b yR = C pp/h. I n such a t r e a t m e n t , however, t h e definition of t h e t e m p e r a t u r e of surrounding air,6 air, seems quite uncertain, and the present reviewer therefore doubts t h e value of applying present b o u n d a r y - l a y e r theory directly to exchange phenomena occurring between air a n d p l a n t bodies within p l a n t - a i r layers.
II. E x c h a n g e of Physical Q u a n t i t i e s Directly a t Plant Surfaces I n P e n m a n and Long's (1960) analysis the concept of "effective length" plays a most i m p o r t a n t role. , by G a a s t r a , 1959) and some aerodynamic consideration of them has been carried out by Raschke (1960) in applying boundary-layer theories. I n the t r e a t m e n t of Raschke t h e h e a t flux transferred from leaves to the adjacent air, for example, is represented by Q M0,eaf- #air) (8) 3 . The Environment of Plant Surfaces 29 whereh is called t h e h e a t - t r a n s f e r coefficient.
E . ( 1 9 5 4 ) . Quart. J. Roy. Meteorol. Soc. 80, 198. S a i t o , T . ( 1 9 6 2 ) . J. Agr. Meteorol. (Tokyo) 17, 101. S a i t o , T . , I n o u e , E . , a n d H o r i b e , Y . ( 1 9 6 2 ) . Λ Agr. Meteorol. (Tokyo) 18, 11. , a n d U e d a , M . (1957). Proc. 6th Japan. Natl. Congr. on Appl. , Tokyo, 195 p . 373. S u t t o n , O. G. ( 1 9 5 5 ) . Quart. J. Roy. Meteorol. Soc. 81, 111. , O h m o r i , H . , a n d O k a n o u e , M . ( 1 9 4 3 ) . J. Agr. Meteorol. (Tokyo) 1, 1. T a n i , N .