Dynamics of microbial biomass C in a black soil under long-term fertilization and related affecting factors

Abstract

Abstract: The effect of long-term fertilization on the dynamics of microbial biomass C in a typical black soil of Northeastern China was studied in a field trail treated by different fertilizations.The results showed that the amount of soil microbial biomass C under different fertilizations varied significantly with growth stages.It was the highest in farmyard manure (M₂ and M₄) treatments,with a less seasonal fluctuation,second in NPK treatment,the peak at sowing period,and the lowest in CK,the peak at wax maturity stage.No significant correlation was found between the dynamic changes of soil microbial biomass C and soil biological,physical and chemical properties in all treatments,but the correlation of soil microbial biomass C with the contents of N,P and K in plants and that of crude protein in grain was significantly positive.

Key words: Black soil, Farmyard manure, Microbial biomass, Growth season, Dynamic change

CLC Number:

S154.36

LI Dongpo, WU Zhijie, CHEN Lijun, ZHU Ping, REN Jun, PENG Chang, LIANG Chenghua . Dynamics of microbial biomass C in a black soil under long-term fertilization and related affecting factors[J]. Chinese Journal of Applied Ecology, 2004, (8): 1334-1338.

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