一株曲霉在石灰性土壤磷素转化中的作用

向石灰性土壤接种1株具有强烈溶解无机磷酸盐的曲霉(Aspergillus sp. 2TCiF2),并进行土壤灭菌和加入葡萄糖或玉米秸秆处理,试图了解在室内培养条件下,该菌株在土壤磷素转化中的作用。结果表明,供试菌株在土壤中能够大量繁殖,充足的碳源更加有利于其生长繁殖,微生物碳最高接近800 mg/kg土。土壤有效磷含量和溶磷量都显著提高,加入葡萄糖或秸秆并不能显著地增强其溶磷作用。微生物所溶解的磷大部分形成微生物磷,少部分释放到土壤溶液中。

Phosphorus Transformation of A Calcareous Soil After Inoculating An Aspergillus sp. Isolate

In this study, an Aspergillus sp. 2TCiF2 isolate was inoculated in a calcareous soil. The soil was received sterilization and added glucose or corn straw treatments. The purpose was to understand the importance of the fungus in phosphate solubilization under room incubation condition. It was found that the fungus developed in this soil during incubation. The addition of glucose or straw was benefit to the fungal growth. Soil microbial biomass carbon increased up to about 800 mg/kg soil. The soil available P content and the solubilized P amount increased significantly due to the fungal inoculation. However,degradable C addition did not result in an increase of phosphate solubilization. It was also found that most of the solubilized P formed into mi-crobial biomass P. A small amount of the solubilized P was released into the soil.