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ATMOSPHERIC NITRATE DEPOSITION AND ENHANCED DISSOLVED ORGANIC CARBON LEACHING

TEST OF A POTENTIAL MECHANISM

^a School of Natural Resources & Environment, Univ. of Michigan, Ann Arbor, MI 48109-1115
^b Current address: Earth, Ecological and Environmental Sciences, Univ. of Toledo, Toledo, OH 43606-3390
^c Dep. of Ecology and Evolutionary Biology, Univ. of Michigan, Ann Arbor, MI 48109-1048
^d School of Forest Resources and Environmental Science, Michigan Technological Univ., Houghton, MI 49931-1295

View larger version (15K): [in a new window]   Fig. 1. Distribution of the four northern hardwood sites along a 500-km climatic and NO3– deposition gradient in Michigan, USA. These stands span the geographic distribution of sugar maple dominated northern hardwood forests in the upper Great Lake States region.

View larger version (30K): [in a new window]   Fig. 2. The influence of experimental NO3– deposition and site on the activity of (A) phenol oxidase and (B) peroxidase, (C) the concentration of soluble phenolics, and (D) the activity of ß-glucosidase. Enzyme activities are least square means, which are adjusted for differences in soil water content. Asterisk represents significance (p > 0.05) and error bars represent standard error of the mean (n = 18).

View larger version (18K): [in a new window]   Fig. 3. Soluble phenolic concentrations in surface mineral soil (y axis) of northern hardwood sites receiving experimental atmospheric NO3– deposition. Although sampling date (x axis) was a significant effect, we found no interaction between NO3– deposition treatment and sampling date. Error bars represent standard error of the mean (n = 12).