石灰性土壤中固磷基质的探讨

Discussions on Medium for Fixing Phosphorus in Calcareous Soils

本文对采自我国北方7省(区)的39个石灰性土样的8项基本性质(CaCO_3<0.01mm物理粘粒、<0.001mm粘粒、游离Fe_2O_3、pH、有机质、速效磷和全磷)进行了分析,并对其磷酸吸收系数(PAC)、固磷百分率和磷肥指数(PFI)作了测定,通过相关分析、通径分析和多元逐步回归分析表明,石灰性土壤的主要固磷基质是<0.01mm物理粘粒,而不是CaCO_3。

Eight main behaviours (CaCO3, 0.01 mm physical claysj 0.001 mm clays$ free Fe2O3, pH, organic matter} available phosphorus} and total phosphorus)of 39 calcareous soil samples taken from 7 provinces (Autonomous Regions)in North China were analysed. Also,phosphorous adsorption coefficient (PAG) , percentage of fixed phosphorus and phosphate fertilizer index (PFI) were determined in this test. Correlation analysis, path analysis and multiple regression analysis showed that the medium for fixing phosphorus in calcareous soils was not CaCO3, but physical clays less than 0.01 mm.