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Table 4 Slopes (%N mo-1) of the significant linear regressions of nitrogen content as a function of time. * = slopes are significantly different from 0 at P < 0.05, ** = slopes are significantly different from 0 at P < 0.005, and *** = slopes are significantly different from 0 at P < 0.0001
Site Condition Sp 13 months 28 months
N slope r2 N slope r2
SAair Rm -0.0040* 0.23    
SAsurface Ag     0.010*** 0.646
SAsurface Lr 0.0090** 0.492 0.005*** 0.521
SAsurface Rm 0.009** 0.532 0.021*** 0.866
SAburied Ag 0.005* 0.222 0.009*** 0.694
SAburied Lr 0.005** 0.572 0.010*** 0.783
SAburied Rm 0.005* 0.261 0.009*** 0.626
SBsurface Ag 0.011*** 0.592 0.014*** 0.861
SBsurface Lr 0.009*** 0.622 0.012*** 0.904
SBsurface Rm 0.011*** 0.601 0.018*** 0.847
SBburied Ag     0.008*** 0.651
SBburied Lr 0.005* 0.378 0.005*** 0.668
SBburied Rm 0.005* 0.261 0.007*** 0.669
SCair Rm -0.003* 0.224    
SCsurface Ag 0.008** 0.45 0.013*** 0.843
SCsurface Lr 0.010*** 0.693 0.007*** 0.755
SCsurface Rm     0.008*** 0.494
SCburied Ag     0.006*** 0.629
SCburied Lr 0.005** 0.506 0.007*** 0.835
SCburied Rm     0.006*** 0.575
SDsurface Lr 0.021** 0.445 0.015** 0.505
SDsurface Rm     0.003* 0.161
SDburied Ag     0.003* 0.168
SDburied Lr 0.004* 0.29 0.004*** 0.682
NHBsurface Ag 0.012** 0.466 0.019*** 0.765
NHBsurface Lr 0.011** 0.566 0.013*** 0.865
NHBsurface Rm 0.010** 0.465 0.018*** 0.818
NHBburied Ag 0.007* 0.3 0.010*** 0.676
NHBburied Lr 0.007** 0.522 0.100*** 0.734
NHBburied Rm     0.010*** 0.619

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