Journal
NUTRIENT CYCLING IN AGROECOSYSTEMS
Volume 68, Issue 2, Pages 181-189Publisher
SPRINGER
DOI: 10.1023/B:FRES.0000017470.14789.2a
Keywords
microbial biomass; red soil; soil profile; vegetation cover
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This study investigated the distribution of microbial biomass carbon ( MB- C ), nitrogen ( MB- N ) and phosphorus ( MB- P ) in the soil profiles of five different vegetation systems including bare area ( Br ), Bamboo ( Bmb ), Chinese Fir ( CF ), Citrus Orchard ( Ctr ) and Rice field ( Rf ). The MB- C levels in the Bmb system were higher than those in the other systems, and it decreased with increasing soil depth in all vegetation systems except the Bmb. The highest MB- N was detected in the top 20 cm of soil for the Bmb and in the 20 similar to 40 cm soil layer for the other vegetation systems such as Ctr, CF and Rf. The order of soil MB- P levels from highest to lowest was as follows: Bmb > CF > Ctr > Rf > Br. In all vegetation systems the level of MB- P decreased with increasing soil depth. Experimental results showed that the ratio of MB- C to TOC ranged from 0.75 similar to 2.7%, agreeing well with ranges previously reported by many others. Results also indicate that vegetation covers and management practices have a strong impact on the development and distribution of soil microbial properties in the soil profile.
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