Relationship Between Soil Microbial Biomass C and N and Mineralizable Nitrogen in Some Arable Soils on Loess PlateauEnglish Full Text

ZHOU JIANBIN and LI SHENGXIU (Department of Soil Science and Agrochemistry, Northwest Agricultural University, Yangling 712100 China)

Abstract: The chloroform fumigation-incubation method was used to measure the soil microbial biomass C （SMBC）and N （SMBN） in 16 loessial soils sampled from Ausai, Yongshou and Yangling in Shaanxi Province. The SMBC contents in the soils ranged from 75.9 to 301.0 μg Cg-1 with an average of 206.1 μg C g-1, accounting for 1.36%～6.24% of the total soil organic C with an average of 3.07%, and the SMBN contents from 0.51 to 68.40 μg N g-1 with an average of 29.4 μg N g-1, accounting for 0.20%～5.65% of the total N in the soils with an average of 3.36%. A close relationship was found between SMBC and SMBN, and they both were positively correlated with total organic C, total N, NaOH hydrolizable N and mineralizable N. These results confirmed that soil microbial biomass had a comparative role in nutrient cycles of soils.

Keywords：

carbon; mineralizable N; nitrogen; soil microbial biomass;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S154

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Relationship Between Soil Microbial Biomass C and N and Mineralizable Nitrogen in Some Arable Soils on Loess PlateauEnglish Full Text

ZHOU JIANBIN and LI SHENGXIU (Department of Soil Science and Agrochemistry, Northwest Agricultural University, Yangling 712100 China)

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