H. RIEKERK and S. P. GESSEL Committee by the Subcommittee on Chemical Cycles. Ecology Section, Oak Ridge National Laboratory (1961). . D. W. Core, Release of Elements from the Forest Floor and Migration Through Associated Soil Profiles (a Lysimeter Study). Ph.D. thesis, University of Washington (1963). . D. W. CoreandS. P. Gessei, Proceedings of the Second North American Forest Soils Congress, Corvallis, Oregon, 1964, In press. (1964). J. J. Davis, Report No. 1 to the Ecology Study tee p. 533 (1960). >. J. S. Orson, V. T, Bower, Jj. E. Cantion and SILVERMAN,Proc. Soil Sci. Soc. Am. 28, 295 (1964). 10. M. L. Jackson, Soil Chemical Analysis. PrenticeHall, Englewood Cliffs, New Jersey (1958). 11, S. P. Gesset, Personal communication (1964). 12. N. P. Remezov, Soviet Soil Sci. 6, 589 (1958). :- TR Forestry Congress, Seattle, Washington, 1960, Vol. 1, Proce. Soil Sci. Soc. Am. 25, 321 (1961). , E. M. Romney, K. A. Frycare and L. B. +P RPE pence, ATT Ss Fa J.D. Ovncron, Proceedings of the Fifth World Dona.pson, Trans. Amr. Fish. Soc. 88, 1 (1959). . D. W. Corz, S. P. Gresser and E. E. Hevp, Co REFERENCES L. R. Donatpson, P, R. Orson and J. R. 7 DEC JAN FEB ates. ~ wtvity. 485 (1964). tees = . M. Wrreamp and M. L. Frank, Radiat. Bot. 4, that time. The count data for “Ca after “emical separation did not show significant POO RYRPMS UE oe OK! 9 . J. P. Wiruerspoon, Jr., Ecol. Monog. 34, 403 & “ern of §Rb from the surface soil during the k. of 1963 (Fig. 4}. The uptake data are presented in Fig. 6. The *? appeared in the trees within a week alter weacation. The uptake during the spring Favn was about ten times that for the fall ruc. The uptake of ®*Rb was much slower wit was significant about a month after appli‘4m to the soil. The fall application of Rb tus not appear in the foliage samples. The uzung factor is most likely to be located in the xx system, because the phosphorus uptake indi‘aed a sufficient biological activity of the trees 1369 fir trees of ®§Rb UNTER UNITY, sly PEY os UVES : . UES BA