Ohuri, K., M.J. Mitchell and J.M. Bischoff.  1999. Effect of landscape position on N mineralization and nitrification in a forested watershed in the Adirondack Mountains of New York. Canadian Journal of Forest Research 29(4):497-508.
 
 

Abstract:  Within a forested ecosystem in the Adirondack Mountains of New York, net N mineralization and nitrification rates were measured at different landscape positions (zones).  Net N mineralization rates (0-15 cm depth) were less (39 kg N.ha-1 per year) within a wetland without alder and with a coniferous overstory than an upland conifer zone (82 kg N.ha-1 per year) and an upland hardwood zone (107 kg N.ha-1 per year).  Net N mineralization rates (39 to 82 kg N.ha-1 per year) and the forest floor N concentrations (2.3 to 2.5%) were higher than values reported (1.2-29 kg N.ha-1 and 1.1-2.12%, respectively)  for other spruce forests.  The net nitrification rates were higher at the upland hardwood zone (29 kg N.ha-1 per year) than the upland conifer zone (2 kg N.ha-1 year).  The wetland conifer zone without alders had an intermediate rate of net nitrification (13 kg N.ha-1 year) compared with the upland zones.  The presence of white alder (Alnus incana (L.) Moench) in the wetland increased the NO3 content and net nitrification rate of the soil.