Compound-specific δ¹⁵N composition of free amino acids in moss as indicators of atmospheric nitrogen sources.

ABSTRACT: Haplocladium microphyllum moss samples were collected in Nanchang, China. Free amino acid (FAA) concentrations and N isotope compositions (δ¹⁵N_FAA) in the samples were determined and compared with the bulk N concentrations and δ¹⁵N_bulk values. The aim was to determine whether δ¹⁵N_FAA values in moss (which are very variable) indicate the sources of atmospheric N. The δ¹⁵N_FAA values among individual FAA varied widely (from -19.3‰ to +16.1‰), possibly because of the different sources of N and isotope fractionation in amino acids metabolic pathways. Total ¹⁵N-enrichment for the individual FAAs was equal to total ¹⁵N-depletion relative to δ¹⁵N_bulk. The concentratio

SUBMITTER: Zhu RG 

PROVIDER: S-EPMC6156404 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature