Nitrogen Stable Isotopic Ratios in Everglades Soils: Spatial Patterns and Environmental Factors.

Natural abundance levels of nitrogen stable isotopes (d15N) can be used to indicate a variety of N cycle processes including N sources, relative losses, and biotic N demand. This study determined d15N ratios in soils throughout the Florida Everglades. More than 1000 data points were used to assess patterns, and correlations within the various Everglades systems, such as Water Conservation Areas, Deepwater Sloughs, and Marl Prairies. Relationships were also derived between water depth, C:N ratios, and total soil P. Results of this study provide the first large scale mapping of wetland soil 15N and can be used to document alteration of the N cycle and as baseline for future changes in the Everglades system.