(Sinsabaugh et al., 1997). The lowest Ecell/Ep values were within ENP-TS, reflecting

higher PHO activity in relation to BGL as well as the low TP values. Ecell/Ep was

correlated with the nutrient parameters TP, TN, TOC, and lignin. The correlations with

the enzymes inclusive in the ratio formulation, BGL and PHO, indicate the greater

variability of phosphorus in this study.

 Benthic Ecell/En significantly increased with P loading in all four areas in 5 of 12

comparisons. The largest range occurred within ENP-TS. There were no correlations to

components that were not related to the ratio. The most significant changes in benthic

Ecell/Eox values occurred within ENP-TS, with higher values at the enriched site.

Conversely, Ecell/Eox was significantly higher in one time period at the reference site in

WCA-2A. Ecell/Eox was not significantly correlated with any other parameters.

Enzyme Index of Carbon Quality (EICQ) values generally did not predict increased C

quality at the enriched sites, with the exception of WCA-2A and WCA-3A, though these

differences were not significant.

Soil Data

 Average 0 to -10 cm soil TP values ranged from 0.2 to 1.0 g kg-1 with

significantly lower concentrations in 7 of 12 cases associated with the REF sites (Tables

4-4 & 4-5). The lowest TP values were associated with the ENP-TS sites. Soil TP was

correlated with TN, TOC, and lignin, and was generally lower than the benthic layer

(Table 4-6). The lowest TP and TN values were both associated with the ENP-TS sites.

TN mean concentrations ranged from 8 to 37 g kg-1 and were significantly different in 5

of 12 cases with 2 of 3 instances reported in ENP-TS. TN was strongly correlated with

TOC, lignin, and negatively correlated with Ca. There was no significant change in TN

content with depth. TOC ranged from 86 to 473 g kg-1 with significantly lower values