Abstract: Using Jiang Bofan and Gu Yichu's fractionation method for calcareous soil's inorganic phosphorus, we have studied the efficacy of aeolian soil's inorganic phosphorus in the processes of shifting sand fixation in Shapotou region. The results indicated that Ca₂-P accounts for 3.1% of total inorganic phosphorus, Ca₈-P 11.4%, ALP 7.0%, Fe-P 5.3%,O-P0.14% and Ca₁₀-P 73.2% in shifting sand soil, respectively; Ca₂-P accounts for 1.7% of total inorganic phosphorus, Cas-P 7.2%, AI-P 5. 1%, Fe-P 3.8%, O-P 0.08% and Ca₁₀-P 82.12% in ameliorated soil, respectively. Among these Ca₂-P and Ca₈-P are main fraction of crop phosphorus nutrition, Al-P and Fe-P are postpone phosphorus, O-P and Ca₁₀-P are all potential phosphorus.

Key words: inorganic phosphorus, fractionationl efficacy phosphorus nutrition, shifting sand