Dynamics of microbial biomass N in different fertilized black soil and its related factors

Abstract

Abstract: This paper studied the dynamics of microbial biomass N in a black soil long-term fertilized with farmyard manure(M₂ and M₄)and chemical fertilizer(NPK)during crop growth season.The results showed that the soil microbial biomass N was 25.52～239.12 mg·kg^-1 in M₄,10.40～94.31 mg·kg^-1 in M₂,6.27～87.04 mg·kg^-1 in NPK,and 9.15～69.81 mg·kg^-1 in CK.In same treatment,the highest value was 7～14 times higher than the lowest value.Treatments NPK and M₂ had the highest value of microbial biomass N at reproductive growth stage,while M₄ and CK had it at vegetative growth stage.The significant difference of soil microbial biomass N caused by different treatments was not changed with plant growth stages.The dynamics of soil microbial biomass N had a significant correlation some soil biological,physical and chemical properties.A significant positive correlation was found between soil microbial biomass N and soil biological,physical and chemical properties,plant N,P and K contents,soil moisture,and grain crude protein.

Key words: Black soil, Long-term fertilization, Microbial biomass N, Dynamic characters, Related factors

CLC Number:

S154.3

LI Dongpo, CHEN Lijun, WU Zhijie, ZHU Ping, REN Jun, LIANG Chenghua, PENG Chang, GAO Hongjun. Dynamics of microbial biomass N in different fertilized black soil and its related factors[J]. Chinese Journal of Applied Ecology, 2004, (10): 1891-1896.

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