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| Author Affiliation: | Agricultural Research and Education Center, University of Florida, Bell Glade, Florida 33430, USA |
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| Title: | Microbial activity in organic soils as affected by soil depth and crop |
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| Source: | Applied and Environmental Microbiology. Vol. 37, No. 6, 1979, p. 1085-1090. |
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| Publishing Information: | Washington, D.C.: American Society for Microbiology |
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| Keywords: | TIC Keywords: Microbial activity; Soil types; Catabolism
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| Geographic Terms: | Florida |
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| Abstract/Contents: | In Pahokee muck, a lithic medisaprist from the Florida Everglades, catabolic activity towards (7-14C)salicylic acid, (1,4-14C)succinate, and (1,2-14C)acetate remained reasonably constant in surface (0 to 10 cm) soil samples from a fallow (bare) field from late in the wet season (May to September) through January. Late in January, the microbial activity toward all three compounds decreased by approximately 50%. The microbial activity of the soil decreased with increasing depth of soil. Salicylate catabolism was the most sensitive to increasing moisture deep in the soil profile. At the end of the wet season, a 90% decrease in activity between the surface and the 60- to 70-cm depth occurred. Catabolism of acetate and succinate decreased by approximately 75% in the same samples. Little effect of crop was observed. Variation in the microbial activity, as measured by the catabolism of labeled acetate, salicylate, or succinate, was not significant between a sugarcane (Saccharum officinarum) field and a fallow field. The activity towards acetate was insignificantly different in a St. Augustine grass (Stenotaphrum secundatum) field, whereas the catabolism of the remaining substrates was greater in the grass field. These results indicate that the total CO2 evolved from the different levels of the soil profile by the microbial community oxidizing the soil organic matter decreased as the soil depth increased. However, correction of the amount of CO2 released at each level for the bulk density of that level reveals that the microbial contribution to soil subsidence is approximately equivalent throughout the soil profile above the water table. |
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| Language: | English |
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| References: | 14 |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
1979. Microbial activity in organic soils as affected by soil depth and crop. Appl. Environ. Microbiol. 37(6):p. 1085-1090. |
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