title: [Topsoil phosphorus forms and availability of different soil and water conservation plantations in typical black soil region, northeast China].
abstract: Aiming to understand soil phosphorus status of plantations in typical black soil region of Northeast China, the topsoil (0-10 cm) phosphorus fractionations and its availability were examined in four soil and water conservation plantations dominantly composed of Larix gmelini, Fraxinus mandshurica, Pinus sylvestris var. mongolica and Populus nigra var. italica x P. cathayan, respectively. The results showed that total P, Olsen-P and the concentration of different P fractionations in F. mandshurica and P. nigra var. italica x P. cathayan plantations were significantly higher than that of the other two coniferous plantations. Organic P was the major fractionation in the four plantations' topsoil, and sodium hydroxide extractable organic P (NaOH-Po ) representing moderately labile organic phosphorus was predominant, which accounted for 58.9% of total P. The contents of H2O-Pi and NaHCO3-P which were more labile to plant were lower, only accounting for 1.2% and 6.6% of total P, respectively. Except for NaHCO3-Po, all the other P fractions of four plantations correlated with each other, and they also had significant correlations with soil organic matter, total P, Olsen-P. Compared with the coniferous plantations, the broadleaf plantations presented higher availability of phosphorus.
authors.forename: Xiao-Yan
authors.initials: XY
authors.lastname: Yang
authors.forename: Rui-Ying
authors.initials: RY
authors.lastname: Fan
authors.forename: En-Heng
authors.initials: EH
authors.lastname: Wang
authors.forename: Xiang-You
authors.initials: XY
authors.lastname: Xia
authors.forename: Xiang-Wei
authors.initials: XW
authors.lastname: Chen
mesh_terms: D002681:China; D065928:Forests; D031661:Fraxinus; D028221:Larix; D010758:Phosphorus / Q000737:chemistry*; D041605:Pinus sylvestris; D012987:Soil / Q000737:chemistry*; D014867:Water
chemical_list: D012987:Soil; D014867:Water; D010758:Phosphorus