采用Bowman-Cole的土壤有机磷分级体系及蒋柏藩-顾益初的无机磷分级体系,运用相关分析,通径分析和回归分析,研究了长期不同施肥条件下土壤有机磷组分、无机磷组分与土壤速效磷相关关系.结果表明,Ca2-P (0.985 5)、Cas-P(0.938 0)、Al-P(0.887 4)、Fe-P(0.850 7)、中活性有机磷(0.851 0)和中稳性有机磷(0.8905)与速效磷的相关性达极显著水平,O-P(0.790 4)、Ca10-P(0.752 7)与速效磷的相关性达显著水平；通径分析结果表明,无机磷各形态对速效磷的直接作用大小顺序为:Al-P(-1.189 0)＞Ca2-P(1.027 4)＞ O-P(0.763 4)＞ Ca8-P(0.663 8)＞ Fe-P(-0.423 0)＞Ca10-P(0.323 2),有机磷各形态对速效磷的直接作用大小顺序为:中活性有机磷(0.762 9)＞中稳性有机磷(0.276 3)＞高稳性有机磷(-0.238 4)＞活性有机磷(0.195 2)；逐步回归分析表明,Ca2-P、Ca8-P、O-P和中活性有机磷都是土壤速效磷的有效来源.%In order to assess the influence of the relationships among phosphorus forms,the correlation analysis, path analysis and multiple regression analysis of organic phosphorus and inorganic phosphorus in loess hilly-gully region after 24 years continuum application fertilizers were researched by the methods of Bowman-Cole's and Jiang-Gu's. The results showed that Ca2-P(0. 985 5) ,Ca8-P(0.938 0) , Al-P(0. 887 4) ,Fe-P(0.850 7) ,ML-OP(0.851 0),MR-OP(0.890 5) ,0-P(0. 790 4) and Ca10-P(0. 752 7) with Olsen-P reached a significant or extremely significant correlation ;The order of direct effect of inorganic phosphorus forms on Olsen-P was Al-P( - 1. 189 0) > Ca2-P( 1.027 4) > O-P(0.763 4) >Ca8-P(0.663 8) > Fe-P( -0.423 0) > Ca10-P(0. 323 2) ;Organic phosphorus forms was ML-OR (0.762 9) > MR-OP(0. 276 3) > HR-OP( -0. 238 4) > L-OP(0. 195 2). The Ca2-P, Ca8-P, O-P and ML-OP were main source of available phosphorus by the multiple regression analysis results.
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