Abstract: With arbuscular mycorrhizal (AM) fungi and the dominant fungus Mortierella sp. from Spartina alterniflora salt marsh soil as phosphate-solubilizing agents, a pot experiment was conducted to study their effects on the available phosphorous (P) content of a costal saline soil and the growth of -Ricinus communis and Kosteletzkya virginica, aimed to provide guidance for the cultivation of salt-tolerant oil plants on costal saline soil. After the combined application of AM fungi and Mortierellasp. agents, the available P content in the soils planted with R. communis and K. virginica increased by 52.9% and 89.0%, respectively, and the plant height, stem diameter, plant fresh weight and dry weight, and leaf chlorophyll content of R. communis and K. virginica increased by 110.0% and 45.4%, 48.8% and 85.5%, 85.9% and 200.0%, 112.0% and 157.0%, and 67.6% and 83.4%, respectively, being significantly higher than the control. Single application of AM fungi or Mortierella sp. also increased the soil available P content and promoted the growth of R. communis and K. virginica, but the effect was lesser than the combined application. For the soil planted with R. communis, no significant difference was observed in applying AM fungi or Mortierella sp.; while for the soil planted with K. virginica, the effect of applying Mortierella sp. in increasing soil available P was significantly higher than that of AM fungi. All the results suggested that both AM fungi and Mortierella sp. could increase the available P content of costal saline soil and promoted the growth of R. communis and K. virginica, and their combined application could have much better effect, being of practical significance in improving the utilization efficiency of our saline soil phosphate resources and promoting the sustainable development of local agricultural production.

Key words: Water circumstances, Spatial patterns, GIS, Loess Plateau