|
|
Journal of Zhejiang University SCIENCE A
ISSN 1673-565X(Print), 1862-1775(Online), Monthly
2002 Vol.3 No.2 P.228-231
Microbial biomass in red soils and its significance in plant availability of nitrogen
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
References:
[1] Brookes, P.C., Powlson, D.S., Jenkinson, D.S.,1984. Phosphorus in the soil microbial biomass. Soil Biology & Biochemistry. 16: 169-175.
[2] Brookes, P.C., Landman, A., Pruden,G., 1985. Chloroform fumigation and the release of soil nitrogen: A rapid extraction method to measure microbial biomass nitrogen in soil. Soil Biology & Biochemistry.17: 837-842.
[3] He, Z., Yao, H., Chen, G. Huang, C., 1997. Relationship of crop yield to microbial biomass in highly-weathered soils of China. In: Plant Nutrition(T. Ando Ed.), Kluwer Acadmic Publishers, Kokyo., p. 751-752.
[4] Insam, H., Mitchell,C.C. and Dormaar, J.F., 1991. Relationship of soil microbial biomass and activity with fertilisation practice and crop yield of three Ultisols. Soil Biology & Biochemistry. 23:459-464.
[5] Smith, J. L. and Paul, E. A.,1991. The significance of soil microbial biomass estimations. In: Soil Biochemistry(J.Bollag and G. Stotzky,Ed.),Marcel Dekker, New York, USA, p.359-396.
[6] Van, V.J.A., Ladd, L. N. And Amato, M., 1985. Turnover of carbon and nitrogen through the microbial biomass in a sandy loam and a clay soil incubated with 14C glucose and 15N(NH4)2SO4 under moisture regimes. Soil Biology & Biochemistry. 17:747-757.
Open peer comments: Debate/Discuss/Question/Opinion
<1>
DOI:
10.1631/jzus.2002.0228
CLC number:
S154.36
Download Full Text:
Downloaded:
2586
Clicked:
5531
Cited:
0
On-line Access:
Received:
2000-12-26
Revision Accepted:
2001-03-18
Crosschecked: