title: [Effects of simulated nitrogen deposition on growth and phosphorus efficiency of Pinus massoniana under low phosphorus stress].
abstract: Atmospheric nitrogen (N) deposition dramatically raised in recent decades, resulting in increases of soil N availability and N/P ratio, which would impact plant growth and P efficiency under low P stress. Taking breeding population of Pinus massoniana as test materials, a pot experiment was conducted to simulate two P conditions, i. e., homogeneous low P availability vs. heterogeneous low P among soil layers, in combination with two N deposition levels on growth traits and P absorption and utilization efficiency of P. massoniana. Under the homogeneous low phosphorus condition, growth traits and P efficiency of P. massoniana were not significantly improved by simulated nitrogen deposition, but significant nitrogen x family interaction effect was detected, with the biomass of family 40x44 and 71x20 being increased, 36x29 and 73x23 being decreased. Under the heterogeneous low P condition, significant N effects on the seedling height, biomass and P absorption efficiency were observed, due to promoted root length and root distribution ratio of topsoil. In addition, the effects of simulated N deposition on growth and P efficiency of P. massoniana were relevant to the N/P ratio. Under the homogeneous low P condition, the N/P ratio of P. massoniana plant was 13.8, plants exhibited a low sensitivity to simulated N deposition, root secreted APase activity was increased but the plant growth was not promoted. In comparison, the plant N/P ratio was 9.7 under the heterogeneous low P condition, and the plant growth and P efficiency were significantly promoted, while no obvious change occurred in root secreted APase activity.
authors.forename: Li
authors.initials: L
authors.lastname: Pang
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhang
authors.forename: Zhi-Chun
authors.initials: ZC
authors.lastname: Zhou
authors.forename: Zhong-Ping
authors.initials: ZP
authors.lastname: Feng
authors.forename: De-Yu
authors.initials: DY
authors.lastname: Chu
mesh_terms: D018533:Biomass; D009584:Nitrogen / Q000032:analysis*; D010758:Phosphorus / Q000032:analysis*; D028223:Pinus / Q000254:growth & development*; D018517:Plant Roots; D036226:Seedlings; D012987:Soil / Q000737:chemistry*
chemical_list: D012987:Soil; D010758:Phosphorus; D009584:Nitrogen