CONTENTS (Cont'd) 



TABLES 



Table Page 

 I. Projects participating in and cooperating with the U.S. IBP Tundra Biome 



Program 5 



II. Sites, plas and treatments employed during 1970 Barrow prc^am 12 



ni. Snow depth on the ground (cm) 16 



IV. Typical wind and temperature profile data, micrometeorological tower 19 



V. Temperature in the vegetative canopy, 10-day means 19 



VI. Incoming short-wave radiation, 10-day means 20 



VII. Albedo measurements over undisturbed and disturbed tundra surfaces, Barrow, 



Alaska 20 



Vni. Sample computer output for canopy, leaf and soil temperatures 22 



IX. Space increments for mesh points 24 



X. Thermal properties of soils 24 



XI. Alaskan tundra environment simulation 28 



Xn. Above ground production 32 



XIII. Primary productivity, phosphorus concentrations and related factors, pond B, 



1970 40 



XIV. Primary productivity, phosphorus concentrations and related factors, pond C, 



1970 40 



XV. Primary productivity, phosphaus and nitrc^en concentrations and related factors, 



pond D, 1970 41 



XVI. Primary productivity, phosphorus concentrations and related factors, subponds 



B and C, 1970 41 



XVII. Soil arthropods, site 2 control plots 45 



XVIII. Soil arthropods, site 1 45 



XIX. Incidence and actual or potential breeding status of adult birds on study plot 



at Barrow, Alaska, 1970 49 



XX. Average seasonal microbial plate counts of Barrow site 2, 1970 51 



XXI. Respiration rates of Barrow soils, 1970 51 



XXII. Average values of parameters from five site 2 control plots by sampling dates 



(PPM in soil solution) 54 



XXIII. Average carbon, nitrogen, and C/N ratios in tesseras, sites 1 and 2 55 



XXIV. The results of acetylene reduction nitrogen fixation measurements for the 



terrestrial Barrow tundra 57 



XXV. Results of nitrogen fixation determinations on plants at site 2, 22 July - 3 Aug, 



1970 58 



XXVI. Early August seasonal parameters on control and manipulated plots 60 



XXVn. Parameter means of three transects (plots 303, 305, 306) 69 



XXVni. Soil arthropod densities 70 



XXIX. Footprint Creek water chemistry, productivity and related factors 72 



XXX. Limnology of the Cape Simpson oil seep ponds 85 



XXXI. Comparison of Barrow and Prudhoe Bay air temperatures (°C) 89 



XXXII, Comparative leaf area indices at Barrow and Prudhoe Bay 91 



XXXin. Community composition number of contacts and percent of total by vascular 



species 92 



XXXIV. Primary production, chlorophyll content, and standing dead at F*rudhoe Bay 



and Barrow 92 



XXXV. Concentrations of selected nutrients in disturbed and undisturbed tundra soils 94 



vii 



