Abstract: This paper reported the content of total phosphorus( P),organic P，available P，and inorganic phosphorus( Pi) fractions in three type of vegetable soils． The results showed that the total P content in 10-year greenhouse vegetable soils was 1 000 mg /kg higher than that of cereal crop soils． The accumulation rate of total P was nearly 100 mg /kg per year，and the content of P accumulation in the vegetable-crop rotation soils was lower． The main P form accumulated in the vegetable soils was Pi，which was above 90% of the total P，while organic P content was 30-170 mg /kg． Most of the P accumulated in vegetable soils was distributed in plough layer( 0-20 cm in depth). But compared with the cereal crop soils，P accumulation was observed in middle and subsoil in vegetable soils． It is especially that organic phosphorus showed relatively serious leaching characteristics． Different types of vegetable soils changed differently in Pi fractions． Pi in alluvial vegetable soil was mainly Ca-P and O-P，and the contents of Ca8-P，Ca₂-P，Al-P increased much more and Ca10-P increased slightly． Pi content in black clay vegetable soil was mainly Al-P，O-P，Ca8-P，and Ca₂-P，while content of Al-P，O-P，Ca8-P and Ca₂-P increased much more． Pi content in vegetable-crop rotation soils was mainly the form of Fe-P and O-P，while content of Fe-P increased much more． Most of Ca₂-P and Ca8-P accumulated in plough layer soil，and 70% of the total amount of the Pi fractions accumulated in 0-80 cm in depth in soil profile． Available P( AP) content in typical old vegetable soils was about 200 mg /kg.

Key words: Vegetable soil, Organic phosphorus, Inorganic phosphorus Fractions, Available phosphorus, Longterm fertilization

CLC Number: 

• S153.6

• S155.4+1