【摘要】 采用三室栽培装置培养三叶草 ,接种VA菌根真菌Glomusmosseae。将根系与VA菌根真菌外生菌丝隔开 ,在菌丝室施用 5种磷酸盐和32 P间接标记磷肥 ,研究外生菌丝对难溶性磷酸盐的活化利用能力。结果表明 ,外生菌丝可以活化吸收磷酸二钙、磷酸八钙、磷酸铝和磷酸铁 ,无法活化利用磷酸十钙 ;各种磷酸盐被活化吸收的量及其对三叶草磷营养的贡献率的大小顺序是磷酸二钙 >磷酸八钙、磷酸铝 >磷酸铁更多还原

【Abstract】 Red clover were grown in three compartment boxes, and were inoculated with VA mycorrhizal fungus, Glomus mosseae. External hyphae were seperated from root system by 30 μm pore size membrane. Phosphorus fertilizer indirectly labeled with 32 P and five kind of phosphates were applied in the hyphae compartment, and the ability of external hyphae to mobilize the sparingly soluble phosphates were evaluated. The results showed that external hyphae mobilized and uptook Ca 2 P,Ca 8 P, Al P,Fe P, but not Ca 10 P. The phosphorus uptake by clover from phosphates and the contribution of phosphates to clover phosphorus nutrition were ranked as Ca 2 P>Ca 8 P,Al P>Fe P.更多还原