『Abstract
　Conversions from rural to urban land uses have the potential to greatly modify soil phosphorus (P) levels. Soils in shrubs, masson pine forest, conifer and broadleaf mixed forest, evergreen broadleaved forest and bamboo forest in the mid-subtropical region along an urban-rural gradient in Nanchang City, southern China, were analyzed for total P and P fractions using the modified Hedley P sequential fractionation method. Results show that the topsoil total P and total exactable P concentrations were significantly higher in the urban area (0.71 g・kg^-1 and 378.50 mg・kg^-1, respectively) than in the suburban (0.30 g・kg^-1 and 150.74 mg・kg^-1, respectively) and rural areas (0.31 g・kg^-1 and 147.38 mg・kg^-1, respectively) (p＜0.05). Among the five P fractions of resin-P, NaHCO3-P, NaOH-P, Sonication-P and HCl-P, the relative abundance of HCl-P in urban forest soils (36％) was the highest and also significantly higher than in suburban (8％) and rural soils (6％), while NaOH-P was the dominant form in suburban (41％) and rural soils (50％). Phosphorus accumulation in the urban soils could affect the cycle of P in urban forest systems, particularly the HCl-P fraction that might rapidly enrich aquatic systems in urban areas.

Keywords: hilly red soil; phosphorus accumulation; soil phosphorus fractionation; urbanization; urban forest』

Introduction
Materials and methods
　Study area
　Plot selection
　Soil sampling and soil P fractionation
　Statistical analysis
Results
Discussion and conclusions
Acknowledgements
References

※土壌リン分別法は、Hedley et al.（1982）を基にした、Crews et al.（1995）とMotavalli and Miles（2002）の方法を用いている。