Pedosphere 12(3): 251--256, 2002
ISSN 1002-0160/CN 32-1315/P
©2002 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Soil microbial biomass nitrogen and its relationship to uptake of nitrogen by plants |
| ZHOU Jian-Bin, LI Sheng-Xiu and CHEN Zhu-Jun |
| College of Resources and Environmental Sciences, Northwest Sci-Tech University of Agriculture and Forestry, Yangling, Shaanxi 712100 (China) |
| ABSTRACT |
| The contents of the soil microbial biomass nitrogen (SMBN) in the soils sampled from the Loess Plateau of China were determined using chloroform fumigation aerobic incubation method (CFAIM), chloroform fumigation anaerobic incubation method (CFANIM) and chloroform fumigation-extraction method (CFEM). The N taken up by ryegrass on the soils was determined after a glasshouse pot experiment. The flushes of nitrogen (FN) of the soils obtained by the CFAIM and CFANIM were higher than that by the CFEM, and there were significantly positive correlations between the FN obtained by the 3 methods. The N extracted from the fumigated soils by the CFAIM, CFANIM and CFEM were significantly positively correlated with the N uptake by ryegrass. The FN obtained by the 3 methods was also closely positively correlated with the plant N uptake. The contributions of the SMBN and mineral N and mineralized N during the incubation period to plant N uptake were evaluated with the multiple regression method. The results showed that the N contained in the soil microbial biomass might play a noticeable role in the N supply of the soils to the plant. |
| Key Words: mineral N, N uptake, soil microbial biomass N |
| Citation: Zhou, J. B., Li, S. X. and Chen, Z. J. 2002. Soil microbial biomass nitrogen and its relationship to uptake of nitrogen by plants. Pedosphere. 12(3): 251-256. |
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