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- W2106010900 abstract "The availability of inorganic N has been shown to be one of the major factors limiting primary productivity in high latitude ecosystems. The factors regulating the rate of transformation of organic N to nitrate and ammonium, however, remain poorly understood. The aim of this study was to investigate the nature of the soluble N pool in forest soils and to determine the relative rate of inorganic N production from high and low molecular weight (MW) dissolved organic nitrogen (DON) compounds in black spruce forest soils. DON was found to be the dominant N form in soil solution, however, most of this DON was of high MW of which >75% remained unidentified. Free amino acids constituted less than 5% of the total DON pool. The concentration of NO3− and NH4+ was low in all soils but significantly greater than the concentration of free amino acids. Incubations of low MW DON with soil indicated a rapid processing of amino acids, di- and tri-peptides to NH4+ followed by a slower transformation of the NH4+ pool to NO3−. The rate of protein transformation to NH4+ was slower than for amino acids and peptides suggesting that the block in N mineralization in taiga forest soils is the transformation of high MW DON to low MW DON and not low MW DON to NH4+ or NH4+ to NO3−. Calculated turnover rates of amino acid-derived C and N immobilized in the soil microbial biomass were similar with a half-life of approximately 30 d indicating congruent C and N mineralization." @default.
- W2106010900 created "2016-06-24" @default.
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- W2106010900 date "2012-12-01" @default.
- W2106010900 modified "2023-10-10" @default.
- W2106010900 title "Amino acid, peptide and protein mineralization dynamics in a taiga forest soil" @default.
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- W2106010900 doi "https://doi.org/10.1016/j.soilbio.2012.06.005" @default.
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