Hubbard Brook Forest Floor Data - Watershed 6 1977 - 58 15x15 cm excavated blocks
Summary

Forest floor mass (80oC ODW, ground) ave =  13.49 kg/m2   N=58
Forest floor organic matter (80oC ODW, ground) ave =  6.06 kg/m2   N=58
Average forest floor thickness (cm) =  7.20 cm    N=60



Organic matter % ODW 
          
 by ave of % OM for each plot:                      =  53.34 %    N=58
 by dividing line 2 by line 1 above  (6.06/13.49)   =  44.92 %



Average mass of forest floor parts:
    
    a. sieved soil        13.49 kg/m2   N=58 for all components
    b. sticks + roots      0.94 kg/m2      
    c. floaters            0.09 kg/m2    
    d. sinkers             0.32 kg/m2   
    e. total pre-sieve    16.86 kg/m2



Elemental analysis:

(For Pb, Cu and Zn averages, N=58.  For Ca and Mg averages, N=57--
there was no sample left from plot 202 when the samples were reashed in 1995.)
 


        Concentration            Amounts
Pb      98.42    ug/g        1000    mg/m2
Cu      10.13    ug/g         116    mg/m2
Zn      47.42    ug/g         508    mg/m2
Ca    1335       ug/g          13.2   g/m2
Mg     250       ug/g           2.78  g/m2