%A"Saarinen, T [Helsinki Univ. (Finland). Dept. of Ecology and Systematics]" %D1996 %I; Academy of Finland, Helsinki (Finland) %2 %J[] %K54 ENVIRONMENTAL SCIENCES, WETLANDS, CARBON CYCLE, NITROGEN, MOSSES, BIOMASS, PLANT GROWTH, CLIMATIC CHANGE, BIOLOGICAL EFFECTS %PMedium: ED; Size: pp. 58-62 %TCarbon-nitrogen interactions and biomass partitioning of Carex rostrata grown at three levels of nitrogen supply %XBiomass and production of vascular plants constitutes a major source of carbon input in peatlands. As rates of decomposition vary considerably with depth, the vertical distribution of biomass may substantially affect accumulation of carbon in peatlands. Therefore, allocation patterns between shoot and roots are particularly important when considering carbon balance of peatland ecosystems. The stimulatory effect of increasing atmospheric concentration of CO{sub 2} or photosynthesis may increase availability of carbon to most C3 plants. Availability of nitrogen may also alter both due to increased atmospheric deposition and changer in mineralisation rates associated with climate change. Most root-shoot partitioning models predict that allocation of biomass is dependent of the availability and uptake of carbon and nitrogen. A decrease in supply of carbon would favour allocation to shoots and a decrease in supply of nitrogen would increase allocation to roots. At a cellular level, non structural carbohydrates and free amino acids are thought to represent the biochemically available fraction of carbon and nitrogen, respectively. The aim of this work is study the long-term growth responses of Carex rostrata to changes in the availability of nitrogen. Special attention is paid to soluble sugars ant free amino acids, which may control partitioning of biomass. (10 refs.) %0Conference %NSA-PUB-1/96; CONF-9510430-;Other: ON: DE97736336; ISBN 951-37-1865-4; TRN: FI9703202 %1 %CFinland %Rhttps://doi.org/ Other: ON: DE97736336; ISBN 951-37-1865-4; TRN: FI9703202 FI %GEnglish