一株耐盐解磷菌的解磷能力及对玉米敏感期生长的影响

从黄河三角洲盐碱化土壤中筛选了一株高效解磷真菌QL1501，经鉴定为草酸青霉菌，菌株QL1501对无机磷的解磷能力远大于对有机磷的解磷，解无机磷最大浓度达85.21 mg/L。菌株QL1501的最适生长pH值为8时菌体生长极好。当NaCl浓度为1%～5%时，菌株解磷能力变化不大，溶液中有效磷浓度为76.08～65.37 mg/L。当溶液中NaCl浓度高于7%时，菌体生长受到较大影响。接种解磷真菌QL1501处理的玉米株高、根干重和植株干重均显著高于未接种的对照处理，说明该解磷菌作为解磷生物肥料具有良好的效果。

Phosphate-Solubilizing Ability of a Saline-Alkali Fungus Strain and Effects on the Growth of Corn in Sensitive Period

Fungi strain QL1501 was screened from the Yellow River Delta in the saline-alkali soil and was identified as penicillium oxalate. The strain QL1501 solubilized more inorganic phosphorus than organophosphorus. The maximum concentration of inorganic phosphorus was up to 85.21 mg/L. The optimum pH which was 8 was the best condition for strain QL1501. Phosphate-solubilizing ability of the strain changed little when NaCl concentration was between 1% and 5%, and the available phosphorus concentration ranged from 76.08 mg/L to 65.37 mg/L. The bacteria growth was affected when the concentration of NaCl was higher than 7%. Height, root dry weight and plant dry weight of the corn were significantly higher in inoculation of phosphate-solubilizing fungi QL1501 treatment than that of unvaccinated fungi treatment. The results suggested that as phosphate-solubilizing biological fertilizer, the phosphate-solubilizing bacterium was effective.