A Study on Variation of Soil Microbial Activity Following Deforestation

摘要

Soil microbial activity is an indicator reflecting soil properties. Deforestation enhances soil loss and soil degradation. This paper concentrates to study on variation of soil organic matter, micro-biomass carbon, microbial population and soil enzyme at the up-slope, middle-slope and down-slope of hillslope in the Loess Plateau after forest vegetation destruction. The results showed that after seven years following deforestation, soil organic matter, soil micro-biomass carbon, microbial population, population of soil bacteria, actinomyces, fungi from 60cm depth of soil profile decreased at upslope, middle-slope and down-slope of hillslope, as compared to five years deforestation, especially in the 25cm depth of soil profile. Likewise, after seven years of forest vegetation destruction, surcease, neutral phosphatase also decreased, as compared to five years of deforestation. Due to micro-topography impact, soil organic matter, micro-biomass carbon, population of soil bacteria, actinomyces, fungi, and neutral phosphatase at shallow gully channel was greater that those at shallow gully slopes. The research results demonstrate that deforestation caused that soil microbial activity obviously decreased.