18 – 2005 – Contents

GUDNI THORVALDSSON and H. TAPANI KUNELIUS
Growth temperature effects on nitrogen concentration in shoots and roots of seven temperate grass species – 3

SUNE DJURHUUS, LARS KROGH and MOGENS H. GREVE
Estimates of the carbon stocks in Danish mires – 11
THORSTEINN GUDMUNDSSON, HÓLMGEIR BJÖRNSSON and GUDNI THORVALDSSON
Elemental composition, fractions and balance of nutrients in an Andic Gleysol under a long-term fertilizer experiment in Iceland – 21
TORKELL JÓHANNESSON, KRISTÍN BJÖRG GUDMUNDSDÓTTIR, JED BARASH, JAKOB KRISTINSSON, TRYGGVI EIRÍKSSON and SIGURDUR SIGURDARSON
Manganese, copper and copper enzymes in blood of Icelandic sheep: Relevance to scrapie – 33

GERDUR GUDMUNDSDÓTTIR and BJARNI D. SIGURDSSON
Photosynthetic temperature response of mountain birch (Betula pubescens Ehrh.) compared to two other broadleaved tree species in Iceland – 43
TORKELL JOHANNESSON, KRISTÍN BJÖRG GUDMUNDSDÓTTIR, TRYGGVI EIRÍKSSON, JAKOB KRISTINSSON and SIGURDUR SIGURDARSON
Molybdenum and sulphur in forage. samples from scrapie-free, scrapie-prone and scrapie-afflicted farms in Iceland – 53

THOROLFUR ANTONSSON, FRIDTHJOFUR ARNASON and SIGURDUR MAR EINARSSON
Comparison of density, mean length, biomass and mortality of Atlantic salmon (Salmo salar L.) juveniles between regions in Iceland – 59
FRIDTHJOFUR ARNASON, THOROLFUR ANTONSSON and SIGURDUR MAR EINARSSON
Evaluation of single-pass electric fishing to detect changes in population size of Atlantic salmon (Salmo salar L.) juveniles – 67

ÁSLAUG HELGADÓTTIR, ÞÓREY Ó. GYLFADÓTTIR AND ÞÓRDÍS A. KRISTJÁNSDÓTTIR
The effects of grass species and nitrogen fertilizer onwhite clover growth and mixture yield in a northern maritime environment – 75