It is also possible that increases in [NO.sup.-.sub.3] result from zones of oxidation of [NH.sup.+.sub.4] or DON to [NO.sup.-.sub.3] within the seepage face, or from inputs of fixed N derived from the N-fixing shrub
Myrica pensylvanica, w hich is present at many places along the pond shoreline.
distichum, 2001 Montezuma, Toxodiam 268 85 mucronatum, 1995 BARRETA Helietta parvifolia, 1989 18 34 BASSWOOD American, Tilia americana, 292 78 1993 Carolina, Tilia caroliniana, 124 107 2001 Carolina, Tilia caroliniana, 155 75 2001 White, Tilia heterophylla, 223 116 1997 BAYBERRY Northern,
Myrica pensylvanica, 10 13 1999 Odorless, Myrica inodora, 33 18 1994 Pacific, Myrica californica, 46 38 1999 Southern, Myrica cerifera, 68 28 1993 (*) Southern, Myrica cerifera, 76 20 1994 (*) Southern, Myrica cerifera, 72 25 1994 (*) Southern, Myrica cerifera, 68 26 1994 (*) BAYCEDAR Suriana maritima, 1995 10 12 BEECH American, Fagus grandifolia, 279 115 1994 BIRCH Alaska paper, Betula 72 64 papyrifera var.