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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2002, Vol. 3 Issue (2): 228-231    DOI: 10.1631/jzus.2002.0228
Biotechnology & Life Sciences     
Microbial biomass in red soils and its significance in plant availability of nitrogen
YAO Huai-ying, HE Zhen-li, HUANG Chang-yong
Department of Soil Science & Agricultural Chemistry, Zhejiang University, Hangzhou 310029, China
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Abstract  A series of laboratory and pot experiments carried out to examine the role of soil microbial biomass in red soils\' nitrogen availability and productivity showed that soil available N (NA), dry matter yield (DMY) of ryegrass, and plant uptake of nitrogen were each closely correlated with microbial biomass-C (Cmic) or -N (Nmic), suggesting that soil microbial biomass is a very important nitrogen pool available to plants in red soils. After correction for the substrate effect, the computed turnover of the Nmic in three tested soils ranged from 63 to 250 days. Soils with low Nmic or light texture generally had higher Nmic turnover rate than those with high Nmic or heavy texture. These results showed that soils with low Nmic, microbial biomass could also play an important role in the availability of nitrogen to plants due to these soils\' high turnover rate.

Key words： Microbial biomass N      Nitrogen availability      Red soil      Ryegrass      turnover rate     
Received: 26 December 2000     
CLC:  S154.36  
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YAO Huai-ying
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HUANG Chang-yong
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YAO Huai-ying, HE Zhen-li, HUANG Chang-yong. Microbial biomass in red soils and its significance in plant availability of nitrogen. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2002, 3(2): 228-231.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2002.0228     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2002/V3/I2/228

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