1. Site Description.- Description of Fennoscandian Tundra Ecosystems.- 2. Abiotic Variables.- Soils of Fennoscandian IBP Tundra Ecosystems.- Climate and Hydrology of Some Fennoscandian Tundra Ecosystems.- 3. Primary Producers.- 3.1. Plant Structure.- Flora and Plant Sociology in Fennoscandian Tundra Areas.- Survey of the Main Plant Communities on Hardangervidda.- Vegetation Mapping at Hardangervidda.- Dispersal and Primary Establishment of Vegetation.- Comparison of Plant Structure on Grazed and Ungrazed Tundra Meadows.- Plant Phenology of Fennoscandian Tundra Areas.- Measurement of Leaf Areas and Leaf Angles of Plants at Hardangervidda, Norway.- 3.2. Biomass and Production.- Plant Biomass and Primary Production of Fennoscandian Subarctic and Subalpine Forests and of Alpine Willow and Heath Ecosystems.- Primary Productivity of Alpine Meadow Communities.- Growth in Populations of Andromeda polifolia on a Subarctic Mire.- 3.3. Plant Processes.- Weight Increase of Some Lichens as Related to Carbon Dioxide Exchange and Thallus Moisture.- CO2 Exchange and Growth of Rhacomitrium lanuginosum and Dicranum elongatum.- On the Effect of Continuous Light on Photosynthesis in Mosses.- Acclimatization Effect in Photosynthesis and Respiration.- CO2 Exchange in Norwegian Tundra Plants Studied by Infrared Gas Analyzer Technique.- Photosynthesis and Respiration of Plants Studied by Field Technique at Hardangervidda, Norway.- The Seasonal Pattern of Photosynthesis of Some Vascular Plants on a Subarctic Mire.- Energy Content and Use of Solar Radiation of Fennoscandian Tundra Plants.- Distribution of 14C Photosynthates in Norwegian Alpine Plants.- Pigment Structure of Vascular Plants, Mosses, and Lichens at Hardangervidda, Norway.- 4. Decomposers.- Decomposition, Microbiology, and Ecosystem Analysis.- Biomass and Production of Soil and Litter Fungi at Scandinavian Tundra Sites.- Microfungal Populations of the Abisko Area, Northern Sweden.- Bacterial Populations of Some Fennoscandian Tundra Soils.- Comparisons ofDecomposition Rates Measured by Means of Cellulose.- Plant Litter Decomposition at Fennoscandian Tundra Sites.- Carbon Losses from Tundra Soils.- 5. Nutrient Cycling.- Nitrogen Fixation in Lichens at Kevo, North-Finland.- Nitrogen Fixation by Bacteria and FreeLiving Blue-Green Algae in Tundra Areas.- Mineral Content of Tundra and Forest Tundra Plants in Fennoscandia.- Analysis of Precipitation at Fennoscandian Tundra Sites.- Organic Compounds in Alpine Plants.- The Input and Significance of Particulate Terrestrial Organic Carbon in a Subalpine Freshwater Ecosystem.
