CONTENTS (Cont'd) 



TABLES (Cont'd) 



Table Page 



XXXVI. Microbiology of Bafrow and Prudhoe Bay 95 



XXXVII. Summer 1970 climatic data from several stations in interior Alaska 100 



XXXVIII. Mean cover abundance values of trees and shrubs on O.'02-ha quadrats in three plant 



communities along the hot -pipe vegetation survey transect 105 



XXXIX. Mean number of stems (column A) and mean percentage cover (column B) of 



shrubs in 1-m^ quadrats in three plant communities along the hot -pipe vegeta- 

 tion survey transect 106 



XL. Mean number of stems of herbaceous species in 1-m^ quadrats in three plant 



communities along the hot-pipe vegetation survey transect 107 



XLI. Mean values of cover percentage classes for cryptogams in 1-m^ quadrats in three 



plant communities along the hot-pipe vegetation survey transect 108 



XLII. Composition of the three plant communities along the hot-pipe vegetation survey 



transect 109 



XLIII. Microfungi and bacteria counts from soils on the hot-pipe and control sites . . . 114 

 XLFV. Density (%) figures for major species components in hot-pipe experimental area 115 



XLV. Site comparisons 116 



XLVI. Percent density in litter and soil of major species components (species making 



up more than 50% of total species) 116 



XLVII. Concentrations of selected nutrients in disturbed and undisturbed taiga soil . . 118 



XLVIII. Nitrc^en fixation by terrestrial ecosystem components alpine tundra 120 



XLIX. Lists of plants tested fa N fixation which showed no evidence for acetylene 



reduction activity 121 



vui 



