Growth and nitrogen utilization in seedlings of mountain birch (Betula pubescens ssp. tortuosa) as related to plant nitrogen status and temperature: A two-year study

摘要: Abstract:Patterns of growth and nitrogen utilization in seedlings mountain birch (Betula pubescens ssp. tortuosa) were monitored by analysis over two growing seasons Abisko, northern Sweden. The grown pots with peat, which placed outdoors under a clear roof (natural light temperature) or greenhouse increased temperature). plants exposed to nutrient (1 10 g m-2 season-1) temperature regimes (ambient ca 2.5°C above ambient) factorial design. climatic conditions rather different during the years study, clearly affected economy seedlings. Nutrient supply was main growth-limiting factor 1992, resulted high root leaf area per unit plant biomass (leaf ratio). In contrast, 1993 factor, production uni...