Biophysical Processes and Primary Production 



77 



20 h 



E 

 u 



H 10 h 

 ? 



0) 



X 



20 Jun 



1970 



I Jul 



II Jul 



Kl^ 



21 Jul 



k 



3 Aug 



Area Index, m^ m ^ 



201- 



Z lOh 



I 



23 Jun 

 1971 



3 Jul 



17 Jul 



27 Jul 



9 Aug 



0. 



Lti 



22 Aug 



1 I ^^ I ■ —r^^ 



T 1 ^ < 



.2 .4 .2 .4 .6 .2 .4 .6 .2 .4 .6 .2 .4 .6 .8 .2 .4 £ 



24 Aug 



.2 .4 .2 .4 .6 .2 .4 .6 .2 .4 .6 .2 .4 .6 .8 .2 .4 .6 



Area Index, m^m"^ 



Ql-eaf BSheoth and Stem 



FIGURE 3-4. Seasonal progression of leaf area index, sheath and stem 

 area index, and inflorescence area index during 1970 and 1971. In- 

 florescence area index is shown by the shaded area to the left of the ver- 

 tical axis. 



0.6 



o.ep I 



Petasites 



0.4 - 



Salix 



-| — ij 



_L 



_1_ 



25 45 65 85 



Inclination, degrees 



FIGURE 3-5. Relative frequency 

 of leaf inclinations (degrees from 

 the horizontal) for five common 

 species in wet meadow tundra: 

 Dupontia fisheri, Eriophorum 

 angustifolium, Carex aquatilis, 

 Petasites frigidus and Salix 

 pulchra. 



