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| DOI： |
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| Effect of Soluble Phosphorus Fungi and Their Combinations on Adsorption-desorption of Phosphorus and Its Transformation in a Reclaimed Soil |
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QIAO Zhiwei， HONG Jianping， LI Linxuan
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College Resources and Environment Engineering, Anshun College, Anshun 561000, China; College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, China
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| Abstract: |
| We studied the effect of phosphorus-dissolving fungi on phosphorus in reclaimed soil using pot experiments grown with rape. Three fungi, Aspergillus niger (Z1), Penicillium (Z2), Mortierella (Z3) and their combinations were examined. During the experiment, we measured the adsorption-desorption and the transformation of the phosphorus. The results showed that the soluble phosphorus fungi could increase the effective phosphorus and phosphatase contents in the reclaimed soils. The treatments with soluble phosphorus fungi and their combination increased the contents of available p and phosphatase by 58.6%~158.9% and 3.7%~87.8%, respectively, compared with those without soluble phosphorus fungi treatment. The maximum adsorption capacity of p under combinations of Z1, Z1+Z3, Z2+Z3, Z1+Z2+Z3 were significantly smaller than that without soluble phosphorus fungi treatment. The adsorption coefficient varied from 0.036~0.069, and the P adsorption between treatments with soluble phosphorus fungi and the non-treatment was insignificant. The average desorption rate in all treatments ranged from 21.14% to 34.57%, and the highest desorption rate was in Z2+Z3, which was 34.57%. The soluble phosphorus fungi had no effect on transformation of O-P, Fe-P and Al-P, while Ca2-P and Ca10-P had substantial impact on transformation of inorganic phosphorus. The soluble phosphorus fungi could inhibit transformation of phosphorus to Ca10-P and increased the content of Ca2-P. Z2+Z3 gave the highest Ca2-P content, being 28.73 mg/kg. In summary, applying phosphorus-dissolving fungi could increase the available phosphorus and improve phosphorus availability in reclaimed soil, facilitating recovery of reclaimed soil. Our experiment revealed that the Z2+Z3 combination is most efficient in improving phosphorus desorption and transformation. |
| Key words: soluble phosphorus fungi; combination; reclaimed soils; phosphorus adsorption-desorption characteristics; transformation |
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