Phosphate Efficiency Comparison of Phosphorus-Solubilizing Bacteria on Insoluble Phosphorus
BI Yinli1, YU Miao1, CAO Nan1, WANG Zhen1, HUANG Bo2
1. College of Geoscience and Surveying Engineering, China University of Mining Technology, Beijing 100083, China;2. Department of Architectural Engineering, Beijing Polytechnic College, Beijing 100042, China
Abstract：Phosphorus is one of essential elements of a large number of nutrients for the plant growth. The soil contains a lot of insoluble phosphate. When available phosphorus is reduced, the plant growth and development would be affected. Solubilizing bacteria could change the insoluble phosphate into soluble phosphorus in order to increase available phosphorus in the soil. Through the corn pot experiment, the different strains named Glomus aggregatum(G.a) and phosphate-solubilizing bacteria isolated from Coal fly Ash (CA), their join effects on the release of insoluble phosphate contained by the land, and the effect on plant growth are compared. The results show that the join effect of arbuscular mycorrhizal fungi and phosphate-solubilizing bacteria significantly increases the plants' aboveground and underground biomass; they efficiently release the insoluble phosphate from adding sand to increase available phosphorus content in the soil; pH is increased from acid to neutral; they increase the activity of acid phosphatase, convert organic nutrients into inorganic one, and make them easily absorb by plants; mycorrhizal inoculation significantly increases root colonization and hyphal density, expands root absorption area, and improves the environment of the rhizosphere soil in order to achieve the purpose for promoting plant growth. Microbial reclamation conducted by arbuscular mycorrhizal and phosphate-solubilizing bacteria is of great significance to the ecological restoration of desertified barren land.
2011, Vol. 29 
