There were definite differences between the five control plots at site 2. Plot 207 consistently 

 had lower concentrations of Al, Fe+\ Fe+', NHj-N, and Si in the soil solution than the other plots, 

 particularly in the upper 10 cm. It also had the highest soil moisture percentages. Further, plot 

 210 appeared to be more similar to plot 207 than to the other three plots with respect to most para- 

 meters. These differences will have to be considered, in the final analysis, when attempting to 

 measure responses to the various natural perturbations at this site. 



Analysis of the tessera samples to provide base-line soil data is still in progress. The only 

 data available at this time are percentages of C and N (Table XXIII). At this time, values are based 

 on a 30°C dry soil weight instead of the conventional 70°C or 105°C weight. Percentages of C 

 and N are very high at both site 1 and 2 but they are both very definitely higher at site 2. This is 

 a reflection of more mesic conditions at the latter site. At both sites the C and N values were 

 high throughout the profiles and there was a tendency toward a decrease and then an increase with 

 depth. This is mainly a reflection of buried organic matter at both sites. The C/N ratios arethe 

 most revealing part of the data at this time. Even though there were rather large differences be- 

 tween the two sites in percentages of C and N, the C/N ratios in comparable depth intervals were 

 amazingly similar. This seems to indicate that state factors and processes, although differing in 

 magnitude, are very similar at both sites. If this is true the C/N ratio may weU prove to be one 

 of the more important measures of the ecosystem. 



Table XXin. Average carbon, nitrogen, and C/N ratios 

 in tesseras, sites 1 and 2*. 



SI 



* PflSED ON SAMPLES OIIEC AT 30 OrU. C. 



VALUES MILL HE AHJllSTtr) TO A 70 OEf. C OR 1J5 OEU C ORY HEIGHT 

 kiHEN THESE DATA BECOME AVAILABLE. 



55 



