Temperature Affects Photosynthesis

Temperature controls the rate of chemical reactions such as photosynthesis. Below 40 degrees Fahrenheit, little metabolic activity occurs in conifers.

In a laboratory study with Douglas-fir seedlings optimum growth occurred when daytime air temperature was 86 degrees Fahrenheit. and soil temperature was 68 degrees Fahrenheit. In contrast, seedlings grown at 59 degrees Fahrenheit. air temperature and 50 degrees Fahrenheit. soil temperature showed only half of the optimum growth.

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Last Modified: 07/05/2007