Abstract
Environment has significance to an organism through the flow of energy and only through energy flow. Energy is transferred between the environment and the organism by radiation, convection, conduction, and evaporation of moisture. The exchange of energy between a plant and its environment is described quantitatively. A description of plant climates is given which includes as variables radiation, air temperature, wind speed, and relative humidity. Important plant properties are absorptivity, leaf size, and internal diffusion resistance to water vapor exchange.

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