| Degradation of potassium-bearing minerals by thermophilic Aspergiilusfumigatus and its optimal conditions |
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| 作者姓名： | Bin LIAN Bin WANG Congqiang LIU |
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| 作者单位： | State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China |
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| 摘 要： | Potassium fertilizer is in short supply in China. However, there is a considerable resource of insoluble potassium resources in the soil mineral or potassium-baring low-degrade rocks. Most of these kinds of potassium exist in aluminous silicate minerals from which potassium cannot be absorbed directly by plants. So it is very important to study how to release potassium from soil minerals or rocks by using biological action. Recently, a large number of researches on degradation of potassic mineral by bacterial but few by fungi have been reported. In order to study the degradation of potassic mineral by fungi, we isolated a strain of thermophilic fungi TH003, which can use potassic rock as nutrient source. The strain was identified as Aspergillus fumigatus based on its morphological characters and molecular biology. In this paper, the direct and indirect processes of mineral powder degradation with the strain of TH003 were studied： mineral powder was added in medium directly for cultivation so as to investigate the direct process. For the purpose of studying indirect process, mineral powder was wrapped up in a parcel using membrane with pore size of 0.22 μm, and then the parcels were added in the medium. The interaction between mineral granules and mycelia was observed by using TEM and AFM at different stages during the whole experimental procedure. The results showed that the effect of direct process is stronger than that of indirect process. For instance, the content of K^＋ is higher in both culture media and mycelia. Direct process includes mechanical demolishment, adsorption, parceling, phagocytosis, erosion and comprehensive effect, while indirect process only refers to erosion on the surface of mineral granules by metabolic products of mycelia. The technology of fermentation engineering was employed to study the biological effects of the strain of Aspergillus fumigatus TH003 on the minerals bating low-grade potassium. Nutrition factors and culture conditions that affect the process of mineral powder degrading with the strain of TH003 were studied in this paper. The results showed that glucose and corn steep are the optimal carbon and nitrogen resources in the strain culture medium, and that pH values range from 3.0 to 9.0.
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| 关 键 词： | 喜温细菌 矿物 发酵 降解作用 |
Degradation of potassium-bearing minerals by thermophilic Aspergiilusfumigatus and its optimal conditions |
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| Bin LIAN Bin WANG Congqiang LIU.Degradation of potassium-bearing minerals by thermophilic Aspergiilusfumigatus and its optimal conditions[J].Chinese Journal of Geochemistry,2006,25(B08):175-175. |
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