Pedosphere 8(2): 143--148, 1998
ISSN 1002-0160/CN 32-1315/P
©1998 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effect of lead-zinc interaction on size of microbial biomass in red soil |
| K. S. KHAN and HUANG Chang-Yong |
| College of Natural Resources and Environmental Sciences, Zhejiang Agricultural University, Hangzhou 310029 (China) |
| ABSTRACT |
| A laboratory incubation experiment was conducted to evaluate the effects of lead and zinc applied alone or in various combinations on the size of microbial biomass in a red soil. Treatments included the application of lead at six different levels i. e., 0 (background), 100, 200, 300, 450 and 600 g g-1 soil along with each of the four levels of zinc (0, 50, 150 or 250 g g-1 soil). Application of lead or zinc alone to soil significantly (P < 0. 001) affected the soil microbial biomass. The microbial biomass carbon (Cmic), biomass nitrogen (Nmic) and biomass phosphorus (Pmic) decreased sharply in soils contaminated with lead or zinc. Combined application of lead and zinc resulted in a greater biocidal effect on soil microbial biomass, which was significantly higher (P < 0. 001) than that when either lead or zinc was applied alone. Consistent increase in the biomass C: N and decline in the biomass C:P ratios were also observed with the increased metal (Pb and Zn) toxicity in the soil. |
| Key Words: interaction, lead, microbial biomass, red soil, zinc |
| Citation: Khan, K. S. and Huang, C. Y. 1998. Effect of lead-zinc interaction on size of microbial biomass in red soil. Pedosphere. 8(2): 143-148. |
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