0.0 0.1 0.2 0.3 0.4 0.5 0.6


0.7 0.8


 Soil Moisture Content (g H20 / g Soil dwt)



Figure 3-1. Soil organic matter content versus soil moisture as measured from 26 differently
 aged stands.


 Net Nmm NH4 Min NO3 Min MOiSture Soil pH SOM Cmb

Net Nmin 0.885**** 0.333*

NH4~ Min 0.342*
 Mid-Aged Class (25-55)
 Net Nmm NH4 Min NO3 Min MOiSture Soil pH SOM Cmb

Net Nmin 0.805**** 0.367* 0.468**

NH4~ Min -0.310* 0.513***
NO3 i
Soil pH -0.411**
 Mature Age Class(60-1 10)
 Net Nmm NH4 Min NO3 Min MOiSture Soil pH SOM Cmb

Net Nmin 0.860**** 0.471*** -0.413** 0.470**

NH4~ Min -0.528*** 0.449** -0.329*
Soil pH -0.412**


Table 3-4. Differences in soil biogeochemical relationships based upon Spearman rank
 correlations r as stratified by forest age class (n = 48).
 Prob > |r| under HO: Rho=0
 Young Age Class (6-20)


Significance of the Spearman rank correlation test: blank: non-significant, *0.05 < p I 0.01,
**0.01 < p I 0.001, ***0.001 < p 5 0.0001, **** p < 0.0001.


6.0
 y = 6.5506x 0.2389
 5.0 -R2 = 0.49
 p < 0.0001

4.0-


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eg' *