By Gaylon S. Campbell

From studies of the 1st edition:
"well prepared . . . instructed as an introductory textual content for undergraduates"   -- AAAS technological know-how Books and Films

"well written and illustrated"   -- Bulletin of the yankee Meteorological Society

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16 2. , 24 hr for a daily cycle, 365 days for an annual cycle). Time is taken as zero when T = f and is increasing. 8) z/D) where D [=(2K/W)I/2] is called the damping depth. 37 A(O), or the temperature fluctuation has been reduced to 37 percent of its surface value. 14, or only 14 percent of the surface value. 8 also says that the time of the maximum and minimum temperature will be shifted with depth. 8 over a two-day cycle. The reduction in amplitude with depth is evident, as is the shift of maxima to later times with increasing depth.

These equations are useful for determining the wind in the microenvironment of many living organisms, but cannot be used for leaves within a canopy or for animals that live within a crop or forest canopy. Prediction of wind within canopies is quite complicated, and we will only give an outline of the problem and a few useful formulas here. 1]. The canopy flow regime can be thought of as being divided into three layers. The top layer, from the top of the canopy down to about the height of the zero plane (z = d), is the layer that exerts drag on the wind above the crop.

Ochs, and S. F. Clifford (1972) Use of scintillations to measure average wind across a light beam. Appl. Optics lI:239-243. GENERAL REFERENCE FOR SOIL TEMPERATURE AND HEAT FLOW Van Wijk, W. R. ). (1963) Physics o/the Plant Environment. New York: Wiley. 1 Using the following midday temperature data a. Plot height as a function of mean temperature b. 01 m. c. 2 A common saying among farmers is "a wet soil is a cold soil. " Is this true? At what water content would you expect a mineral soil to warm fastest (or have the largest damping depth)?

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