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Productivity of peatland ecosystems is often limited by dissolved forms of inorganic and organic nitrogen. The magnitude and composition of the free amino acid pool and nitrate and ammonium content of pore water from peat were determined during three seasonal periods for mesocosms with various dominant plant functional types. Leucine dominated the free amino acid pool for all mesocosms, and the range of total free amino acid concentrations was 0-2.3 μM. Plant functional type did not significantly influence the free amino acid pool. Seasonal variations in amino acid concentrations were observed with maximum concentrations in spring. Springtime amino acid concentrations correlated with dissolved organic carbon. Amino acid concentrations tracked ammonium and nitrate concentrations in spring and summer. Amino acid concentrations were the lowest in the November, post-growing season period and showed weak correlations with other chemical species in pore water. The cycling of amino acids in pore water appeared a The material contained in this chapter is in preparation for submission to a scientific journal. 24 to be regulated by microbial processes, and environmental drivers like temperature indirectly influenced availability of amino acids.

The role of amino acids in the nitrogen cycle of peatlands