Phosphorus forms on the desert particles in Inner Mongolia

Based on the influence area, the movement route and the drop site on sea of the middle-path sandstorm, phosphorus forms and distribution of the desert particles from 7 representative sites are analyzed using the sequential extraction method. The results show that the concentration of Total Phosphorus (TP) in the desert particles with different sizes is in the range from 308.12 μg·g^-1 in Ulan Buh Desert (Y₁) to 1435.65 μg·g^-1 in Gansu Zhangye (Y₃). The Inorganic Phosphorus (IP) in all the desert particles investigated is mainly phosphorus forms, its concentration is in the range from 300.16 μg·g^-1 to 1324.58 μg·g^-1 (86.11% - 99.31% of TP). The concentration of the Organic Phosphorus (P_org) is from 3.94 μg·g^-1 to 111.07 μg·g^-1 (0.69% - 13.89% of TP). The P bonded by Calcium (PCa) is the major component of the IP, its concentration is from 257.65 μg·g^-1 to 1303.09 μg·g^-1 (48.22%-98.83% of IP).