CONTENTS (Cont'd) 



ILLUSTRATIONS (Cont'd) 



Figure Page 



24. ' Cross sections and thaw profile under three sections of the weasel tracks .... 68 



25. Soil trench across weasel track showing burned organic and undulation in frost 



table 69 



26. ' Headwall erosion on Footprint Greek after summer had ceased 72 



27. Close-up of one of the site 3 oil plots 76 



28. Oil treated pond showing accumulation of oil amongst emergent vegetation as a 



result of wind action 78 



29. Edge of oil treated pond showing damage to terrestrial vegetation where oil spill 



was introduced 79 



30. Location map for the Cape Simpson seeps 80 



31. Ground view of a Simpson oil seep 82 



32. Close up of active oil flow inundating the vegetation 82 



33. Close-up of the transect with the oil seep in the background 83 



34. Location map for Prudhoe Bay region, showing road network and sample sites 



A through E 88 



35. Aerial oblique view of characteristic Prudhoe Bay terrain showing a gravel pad 



and road 89 



36. Location map of study sites adjacent to the hot-pipe disturbed area 98 



37. Aerial oblique photograph of the hot-pipe test section and the adjacent un- 



disturbed birch and spruce stands 99 



38. Diurnal temperatures in spruce and birch forests 100 



39. Cover-abundance values for four tree species in 23 0.02 ha (10 x 20-m) quadrats 



along the hot-pipe vegetation survey transect 102 



40. Cover-abundance values for three shrub species in 23 0.02 ha (10 x 20-m) 



quadrats along the hot-pipe vegetation survey transect 103 



41. Percentage cover of three shrubs in 105 1-m^ quadrats along the hot-pipe 



vegetation survey transect 103 



42. Stem counts of six major herbaceous species in 105 1-m^ quadrats along the 



hot-pipe vegetation survey transect 104 



43. Cover percentage classes of Hylocomium splendens and two major groupings 



of cryptogams in 105 1-m^ quadrats along the hot-pipe vegetation survey 



transect 106 



44. Demographic data for three samples sites near Fairbanks, Alaska 112 



VI 



