THE PHOSPHORUS FRACTIONS AND THE TURNOVER TIME OF INORGANIC PHOSPHORUS IN DIFFERENT TYPES OF LAKES,1

Abstract

Concentration of three forms of phosphorus was measured in nine lakes throughout one year. The fraction occurring as soluble organic was similar in eight lakes. Results of previous workers were produced by using their methods of separating scston from the water. Use of a filter with 0.1‐ µ ‐diameter pores reduced the soluble organic fraction to 18% of the total. Turnover time of inorganic P was less than 10 min in all lakes during the summer but increased during the winter.