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Published online 3 August 2006
Published in Soil Sci Soc Am J 70:1652-1661 (2006)
DOI: 10.2136/sssaj2004.0070
© 2006 Soil Science Society of America
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Microbial Indicators of Nutrient Enrichment

A Mesocosm Study

R. Corstanje* and K. R. Reddy

Wetland Biogeochemistry Lab., Soil and Water Science Dep., Univ. of Florida-Institute of Food and Agricultural Sciences, 106 Newell Hall, P.O. Box 110510, Gainesville, FL 32611; R.Corstanje, current address: Rothamsted Research, Herts, AL5 2JQ, United Kingdom


Figure 1
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  		Fig. 1. Schematic overview of the enriched mesocosm, with the top view (a) illustrating the main water inputs and side view (b) representing the main dimensions.

 

Figure 2
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  		Fig. 2. Microbial biomass carbon (MBC) content in the two mesocosms, presented by depth in the two vegetation communities (Cladium sp. and Typha sp.) over seven different sampling events.

 

Figure 3
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  		Fig. 3. Microbial activities (CO2) in the two mesocosms, presented by depth in the two vegetation communities (Cladium sp. and Typha sp.) over seven different sampling events.

 

Figure 4
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  		Fig. 4. Methane production (CH4) in the two mesocosms, presented by depth in the two vegetation communities (Cladium sp. and Typha sp.) over seven different sampling events.

 

Figure 5
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  		Fig. 5. Acid phosphatase activities in the two mesocosms, presented by depth in the two vegetation communities (Cladium sp. and Typha sp.) over seven different sampling events.

 

Figure 6
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  		Fig. 6. ß-glucosidase activities in the two mesocosms, presented by depth in the two vegetation communities (Cladium sp. and Typha sp.) over seven different sampling events.

 

Figure 7
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  		Fig. 7. Relative proportion of microbial biomass in the overall P, N pools (a,b), the metabolic quotient (c) (qCO2, Anderson and Domsch, 1990), the proportion of P and N turnover (PMP & PMN) as fraction of the total P and N pools (c,d) and the P turnover (PMP) per mesocosm biomass (e) in the surface soils (detritus to 5 cm's depth, Exp; Experimental; Ctrl; Control).

 

Figure 8
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  		Fig. 8. Distribution of the relative proportion of acid phosphatase (Ep) to ß-glucosidase (Ec) in the two mesocosms, by vegetation type.

 




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