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In this paper, to Jiang Bofan - Gu Yi early the inorganic phosphorus grading system, systematic study of the long-term different fertilization treatments of inorganic phosphorus in the topsoil form transformation and its variation in time, space, and the use of correlation analysis, path analysis and Stepwise regression analysis to study the relationship between the components of soil inorganic phosphorus and available phosphorus, in order to obtain long-term different fertilization treatments change characteristics of soil inorganic phosphorus forms in time and space. The results show that: the red soil, neutral purple soil, soil, loess soil, gray desert soil phosphorus inorganic phosphorus content ratio is 53.90% to 72.46%, 69.70% and 77.36%, 60.95% and 77.87 %, from 70.03% to 84.94%, from 76.89% to 86.52%; black soil inorganic phosphorus in the proportion of total phosphorus in the range of 34.97% to 48.16%, black soil organic phosphorus occupies a large proportion. 6 typical soil, in addition to the red soil outside the inorganic phosphorus Ca-P-based, in particular, the highest content of Ca 10 -P, purple soil, loess soil, gray desert soil and in aquatic soil in Ca < sub> 10 -P content of more than 60%, only 38.3% of the high organic matter content of the black soil Ca 10 -P; behalf of the red soil of the south acid soil Ca-P content less OP is Fe-P. The different fertilization has not changed in 15 years the ratio of the size of the gray desert soil and the influx of soil inorganic phosphorus content of each component relationship, and some change, fertilizer and organic fertilizer in the soil, purple soil and loess soil, as well as the size of the proportion of black soil in relationship with facilities is line with the inorganic phosphorus content of each component in the black. CK and N treatments without P fertilizer Ca 2 -P, Al-P and Fe-P impact in various soil types consistent performance, the absolute amount is reduced, to Ca 2 -P the largest decrease. The Ca8-P, OP and Ca 10 -P absolute content of various soil types showed inconsistent. Phosphate fertilizer processing the relatively high of Ca of activity 2 -P, Ca8-P, Al-P, Fe-P in the ratio of total inorganic phosphorus decreased, while the low activity the OP and the Ca 10 -P's saw a significant increase. Description P fertilizer phosphorus accumulation in the soil toward the low activity of OP and Ca 10 -P in the direction transformation. Application of phosphate fertilizer makes the various components of inorganic phosphorus in the various soil types have increased, In addition to the red soil Ca 2 -P increase, red soil is based on Ca8-P and Al- P increased. Single organic manure, straw, can improve the high activity of soil phosphorus content of the component, but the effect is not as good as application of fertilizers and chemical fertilizers and organic fertilizers. Fertilizer and organic manure fertilizer is the best way to fertilization, active phosphorus content in the soil is particularly evident in the black soil, red soil and loess soil, black soil with high organic matter content is no exception. Different rotations of the various forms of inorganic phosphorus, especially for the higher activity of inorganic phosphorus. Phosphorus content in soil fertilized presence of higher activity form. Inorganic phosphorus Ca 2 -P showed the highest activity, but because of its content is limited in various soil types, the relative effectiveness of its available phosphorus is low (except gray desert soil). Path analysis and stepwise regression analysis shows that, Ca 2 -P, Al-P is the main source of phosphorus of the red soil available phosphorus in the residual inorganic phosphorus in the alluvial soil to the highest relative effectiveness of Al-P , the highest relative effectiveness of the loess soil, the residual inorganic phosphorus Ca8-P, gray desert soil residual inorganic phosphorus to Ca 2 -P and Fe-P relative effectiveness of the highest purple soil The the residual inorganic phosphorus and the black are the highest in the relative effectiveness of the Fe-P.
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