Effects of phosphorus fertilizer application rate on transformation processes of phosphorus fractions in the purple alluvial soil of a riparian zone  

作　　者：HE Li-ping JIA Kai-tao LIU Dan WANG Ke-hong DUAN Lin-Yan LIN Jun-jie 

机构地区：[1]Key Laboratory of Water Environment Evolution and Pollution Control in the Three Gorges Reservoir,Chongqing Three Georges University,Chongqing 404100,China [2]Department of Agricultural and Forestry Science and Technology,Chongqing Three Gorges Vocation College,Chongqing 404000,China

出　　处：《Journal of Mountain Science》2023年第6期1561-1574,共14页山地科学学报（英文）

基　　金：supported by the Program of Chongqing Science and Technology Commission(cstc2020jcyj-msxmX0095);the Chongqing Municipal Key Laboratory of Institutions of Higher Education(WEPKL2018ZD-05);the Science and Technology Research Program of Chongqing Municipal Education Commission(KJZDK202001203,KJZDK202003501);the Innovative Research Group of Universities in Chongqing(CXQTP19037);the Sustainable Development Research Centre of Three Gorges Reservoir Area(18sxxyjd11)。

摘　　要：Effects of phosphorus(P)fertilizer application rate on soil transformation processes of P fraction are still unclear in the riparian zone.Purple alluvial soils in the riparian zone of the Three Gorges Reservoir were collected to conduct a 21-day incubation executed by two hydrological environments(drying and flooding)and ten application rates of P fertilizer.Transformation percentages of P fertilizer(TPPF)were calculated as content differences of soil P fractions between fertilizer addition and none fertilizer addition divided by soil total P increases caused by fertilizer addition.TPPF to inorganic P extracted by sodium hydroxide(NaOH-Pi)and hydrochloric acid(HCl-Pi)increase by 20.91%(9.71%)and 24.26%(40.72%)under the drying(flooding)environment.Instead,TPPF to the other fractions decrease.Phosphorus fertilizer input mainly has indirect positive and negative effects on organic P via precipitated P under the drying and flooding environments and finally has indirect positive effects on labile P(p<0.001).Percentage changes of water-soluble inorganic P(H2O-Pi)and HCl-Pi under the flooding environment are higher than that under the drying environment,and percentage changes of organic P extracted by sodium hydrogen carbonate(Na HCO3-Po)and NaOH-Pi show an opposite trend(p<0.01).?(differences in soil P fraction content between flooding and drying incubations)H2O-Pi is negatively correlated with?NaHCO3-Po,and?NaHCO3-Po is positively correlated with?NaOH-Pi(p<0.001).In conclusion,P fertilizer is transformed more into precipitated P than into other P fractions with an application rate increase.Phosphorus fertilizer input mainly increases organic P via precipitated P under the drying environment and decreases organic P via precipitated P under the flooding environment,and organic P is further transformed into labile P.With P fertilizer input,P release caused by flooding is derived from NaHCO3-Po release triggered by NaOH-Pi release.The results can be helpful for the understanding of P fertilizer migration processes from th

关 键 词：Hedley fractionation Phosphorus fraction Hydrological environments Three Gorges Reservoir Application rate Riparian zone 

分 类 号：X131[环境科学与工程—环境科学]