Theses and Dissertations


Title: Determination of the cumulative light penetration to various depths in pond waters

Name: Perkins, Jr Kenneth Edwin

Degree: MS

Chair: Dr. George N. Greene

Resides: FAA Library

University: Auburn

Location: Auburn, Alabama

Date: 1967

Pages: 43

Keywords: Cumulative Light Penetration,Depth.

Abstract:

An inexpensive method for measuring the cumulative light penetration to various depths in pond waters was evaluated. Light intensity was measured in three earthen ponds by booklets of light sensitive paper, Sepia Ozalid Paper No. 402 I.T., stationed at one-foot intervals from the surface to the pond bottom. The booklets were exposed for twenty-four hour intervals, then fixed with a dry development in ammonia vapor. The number of sheets of the booklet that were bleached by exposure to light was converted to foot-candle-hours by reference to a graph prepared from laboratory data. Net oxygen produced was measured by the light and dark bottle method in a pond with relatively clear water, and these data were compared with values obtained from the Ozalid booklets for correlation, particularly with regard to the depth of maximum penetration of measurable cumulative light. On each date that the two tests were performed concurrently, the depth at which the cumulative quantity of light was not sufficient to produce photosynthesis agreed with the depth at which the cumulative light was not sufficient to produce bleaching of the Ozalid booklets. Also, from the same tests, the maximum rate of photosynthesis was correlated to an optimum cumulative light intensity range. The Ozalid booklets provided a simple, inexpensive, and sufficiently sensitive means of measuring a wide range of cumulative quantities of light in aquatic conditions.

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