Abstract:
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),MROP( 0． 890 5),O-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．
Key words:
Long-term fertilizer experiment,
Phosphorus forms,
Correlation coefficient,
Path coefficient,
Multiple regression analysis．
CLC Number:
YANG Yan-ju, WANG Gai-lan, ZHANG Hai-peng, ZHAO Xu. Effects of Long-term Fertilization on Relationship among Phosphorus Forms in Loess Hilly-gully Region[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2012, 27(6): 191-195. doi: 10.3969/j.issn.1000-7091.2012.06.037.