Change in forms of phosphorus in a typical Hapli-Udic Isohumosols(black soil) under a 15-year long-term fertilization experiment was studied.Results show that accumulation of soil Al-P and Ca2-P was positively related to P application rate;application of NK stimulated the plant to absorb Ca8-P;and the concentration of Occluded-P(Oc-P) was decreased.P application did increase the content of Fe-P in the black soil,but did not the content of Ca10-P.In terms of content in the black soil,the various forms of in-organic P were in the order of Fe-P>Ca10-P>Al-P>Ca8-P>Ca2-P>O-P.P fertilizer application increased organic P in the soil,but it did not increase the content of organic matter.Instead,the content of organic matter dropped to a varying degree in different treatments.Application of N 112.5 kg hm-2 a-1and P 20 kg hm-2 a-1 could keep I-P in balance in the soil.
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Lin Dexi, Fan Xiaohui, Hu Feng, Yang Linzhang, Han Xiaozeng. FORMS OF PHOSPHORUS IN HAPLI-UDIC ISOHUMOSOLS SOILS AFTER LONG-TERM FERTILIZATION[J]. Acta Pedologica Sinica,2006,43(4):605-610.