Abstract: The utilization of insoluble phosphate by 2 years old larch(Larix gmelini) seedlings was studied in greenhouse.The seedlings were grown in sand and AlPO₄ was supplied as a source of P.The results showed that larch seedlings could utilize some amount of AlPO₄. Supplied with AlPO₄ but not incubated with mycorrhizal fungi,the seedlings could absorb 35.1% and 64.9% of the phosphorus uptake when supplied with soluble phosphate.The effects of various mycorrhizal fungi on utilization of phosphate were different,i.e.,the utilization rate of AlPO₄ was higher when incubated with Suillus granulatus,but was similar to control when incubated with Suillus grevillei. The proportion of root/crown became higher under P starvation,and larch seedlings could gain more P by enlarging their root growth.

Key words: Larix gmelini, Phosphorus starvation, Mycorrhizal Fungi, Insoluble phosphate, Rhizosphere, Longxi River, vegetation coverage, Wenchuan earthquake, remote sensing, vegetation recovery