Exchange of Radioactive Phosphorus 32P between the Components of an Artificial Plant Community

In artificial plant communities (wooden cases with soil) the following plants were grown together for one year: case No. 1: Betula verrucosa Ehrh. (2 specimens) and Carex pilosa Scop.; sases No. 2 and 3: Alnus incana (L.) Mnch., Fraxinus excelsior L., Podus avium Mili., Aegopodiurti podagraria L., Eupatorium cannabinum L. and others. Into the stalks or stems of one to three plants of every case 32 P was introduced. After 3 months all the plants in every case contained radiactive phosphorus. There were great differences in 32 P concentration (up to ten-fold) between plants grown in the same case. The concentration of 32 P in plants into which it had not been introduced was of the range of 0.1%.