LIU Yu-jie1,2, WANG Shi-jie1*, LIU Xiu-ming1, LIU Fang3
(1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China; 3. Institute of Environment and Resource, Guizhou University, Guiyang 550025, China)
Abstract: Characteristics of soil microbial amount, microbial biomass carbon (BC), microbial biomass nitrogen (BN), microbial quotient (qSMBC), basal respiration and metabolic quotient (qCO2) in different microhabitats were studied in three sites (virgin forest, secondaryforest and shrubbery) of the Maolan National Nature Reserve. The results showed that the microbial amount, BC, BN, basal respiration and qSMBC were all higher in stone gully than those on soil surface, while the qCO2 was higher on soil surface than that in stone gully, in other words, microbial activity indicators in stone gully were basically better than those on soil surface, therefore, the stone gully should be given priority to its utilization in the process of natural restoration of karst ecosystems. With negative succession (from virgin forest to secondaryforest, then to shrubbery), BC, BN, qSMBC, basal respiration and the amount of fungi approximately showed a downward trend, indicating thatthe soil quality declined during negative succession. Meanwhile, soil carbon was lost. Whereas, due to the nutrients competition between fungi and bacteria, moreover, lignocellulose contents of litter increased. The result was that the number of bacteria and the number of actinomycetes increased during the process of vegetation degradation.
Key words: microhabitat; microbial biomass carbon and nitrogen; microbial amount; microbial quotient (qSMBC); metabolic quotient (qCO2)
EARTH AND ENVIRONMENT Vol. 39, No.3, Tot No.285, 2011, Page 285-291
