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The Fate of ¹⁵NO^-₂ Tracer in Soils under Different Tree Species of the Catskill Mountains, New York

^a Dep. of Plant Biology, 265 Morrill Hall, Univ. of Illinois, 505 S. Goodwin Ave., Urbana, IL 61801
^b Institute of Ecosystem Studies, Box AB, Millbrook, NY 12545

View larger version (27K): [in a new window]   Fig. 1. Results of two-way analysis of variance testing the effects of (a) tree species and (b) time of incubation on mean 15NO-2 recoveries in various pools for soils from the Catskill Mountains, New York. Error bars are + one standard error. Bars within a pool with different letters are significantly different as determined by Tukey's honestly significant difference test at = 0.05. Number of observations = 8 for each mean value in panel (a), except N2 and N2O of maple which had seven as the result of sample loss from instrument problems. Number of observations equals 12 for each mean value in panel (b), except N2 and N2O at 24 h which had 11 as the result of sample loss from instrument problems.