title: [Soil P availability in larch rhizosphere].
abstract: Soil samples were collected from the rhizosphere and non-rhizosphere of larch(Larix gmelini) stand by exfoliation method, and the variation of P concentration was analyzed. The results show that there was no significant difference between total P concentrations in the rhizosphere and the non-rhizosphere soil, while the concentration of available P in rizhosphere soil was significantly higher than that in the non-rhizosphere soil. The concentrations of available P in rhizosphere 12 years old and 40 years old larch rhizosphered by 12.6% and 23.4% respectively, indicating that larch roots had the effect of mobilizing soil phosphorus. The components of inorganic P in rhizospheric soil were different from those in non-rhizospheric soil. The concentration of O-P was lower, and the concentrations of Al-P, Fe-P, Ca-P, NH4Cl-P were higher in the rhizosphere. The pH of rhizospheric soil was lower than that of non-rhizospheric soil, but no further acidification was observed. There was no close relationship between pH variation and available P concentration in larch rhizosphere.
authors.affiliation: Xishuangbanna Tropical Botanic Garden, Chinese Academy of Sciences, Kunming 650223.
authors.forename: Y
authors.initials: Y
authors.lastname: Zhang
authors.forename: S
authors.initials: S
authors.lastname: Bai
authors.forename: Z
authors.initials: Z
authors.lastname: Wang
authors.forename: Q
authors.initials: Q
authors.lastname: Wang
mesh_terms: D006863:Hydrogen-Ion Concentration; D028221:Larix / Q000502:physiology*; D010758:Phosphorus / Q000502:physiology*; D012987:Soil / Q000032:analysis*
chemical_list: D012987:Soil; D010758:Phosphorus