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Microbial biomass and relative contributions of bacteria and fungi in soil beneath tropical rain forest, Hainan Island, China

Published online by Cambridge University Press:  10 July 2009

Jia Cheng Yang  and
Heribert Insam
Jia Cheng Yang
Affiliation:
Inslilul für Bodenbiologie, FAL, Bundesallee 50, 3300 Braunschweig, Germany
Heribert Insam
Affiliation:
Inslilul für Bodenbiologie, FAL, Bundesallee 50, 3300 Braunschweig, Germany
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Abstract

Soil microbial biomass (Cmic.) and is relation with soil carbon and nutrient contents in a tropical rain forest (Bawangling Nature Reserve, Hainan Island, P.R. China) were studied. Cmic. was determined by the substrate induced respiration (Sir) method; bacterial and fungal fractions were measured using a selective inhibition technique. For the A horizon, Cmic ranged between 350 and 700μgg-1 soil in April (beginning of the rainy season) and 250–600μg g-1 in October (end of the rainy season). Cmic. contents of the AB and B horizons were lower, ranging from 80 to 350 μg Cmic g-1 soil. On average, 75% of the biomass was bacterial, in the AB and B horizon this was slightly higher than in the A horizon. Cmic was closely correlated with Corg and N content. N and P contents as well as the respiratory response upon glucose addition indicated that towards the end of the rainy season compared with the start the soils were depleted in nutrients. These observations stress the importance of microbial biomass as a factor for nutrient retention in tropical forest ecosystems.

Keywords

bacterial biomassfungal biomassmicrobial biomassselective inhibitionsoiltropical rain forest
Type
Research Article
Information
Journal of Tropical Ecology , Volume 7 , Issue 3 , August 1991 , pp. 385 - 393
Copyright
Copyright © Cambridge University Press 1991

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