Abstract: Eleven red soils varying in land use and fertility status were used to examine the effect of land use on microbial biomass -C, -N and -P. Microbial biomass-C in the red soils ranged from about 68 mg C/kg to 225 mg C/kg, which is generally lower than that reported from other types of soil, probably because of low organic matter and high acidity in the red soils. Land use had considerable effects on the amounts of soil C_mic. The C_mic was the lowest in eroded fallow land, followed by woodland, tea garden, citrus grove and fallow grassland, and the highest in vegetable and paddy fields. There was significant correlation between C_mic and organic matter content, suggesting that the influence of land use on C_mic is mainly related to the input and accumulation of organic matter. Microbial biomass-N in the soils ranged from 12.1 Nmg/kg to 31.7 Nmg/kg and was also affected by land use. The change of N_mic with land use was similar to that of C_mic. The microbial C/N ratio ranged from 5.2 to 9.9 and averaged 7.6. The N_mic was significantly correlated with soil total N and available N. Microbial biomass-P in the soils ranged from 4.5 mg P/kg to 52.3 mg P/kg. The microbial C/P ratio was in the range of 4-23. The P_mic was relatively less affected by land use due to differences in fertilization practices for various land use systems.

Key words: Land use, Microbial biomass-C, -N and -P, Red soils

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