268 



H. POLSTER 



S T 



l-O 



0-5 



30 



20 



/ ..;.\ 



-...T rF W 



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1 1 1 1 1 1 1 T 1 1 1 I I 



6 8 10 12 14 16 I8h 



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25-8 



l-O 



'^e 0-6 



O 



I 



°'0-2 



Tronspiration 



-1 1 1 r 



8 



10 



12 



14 



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/\ south side ol the crown 



A crown interior 



iL north side of the crown 



Fig. II. Assimilation and transpiration of Quercus robur in difFerent regions of the 

 crown, 24/8/59; outpost position of the forest steppe. Key as for Fig. 10. 



