北方耕地和蔬菜保护地土壤磷素状况研究

Fractions of phosphorus in cultivated and vegetable soils in northern China

以北方一般耕地和蔬菜保护地为供试土壤 ,研究了不同种植条件下土壤磷素状况 ,蔬菜保护地土壤磷素的空间分布特性。结果表明 ,蔬菜保护地土壤全磷、无机磷、有机磷、Olsen P的平均含量是一般耕地土壤的 2 7～ 14 0倍 ,土壤Olsen P占全磷的比率 ,Ca2 P ,Ca8 P ,Al P占土壤无机磷的比率显著高于一般耕地土壤。蔬菜保护地土壤各形态磷素主要积累在 0～ 2 0cm土层 ,并随土层深度的增加各形态磷素的含量逐渐降低 ,各土层Olsen P ,Ca2 P ,Ca8 P ,Al P含量降低幅度明显高于Fe P ,O P ,Ca10

Fractions of phosphorus in cultivated and vegetable soil in northern China was studied. The main results showed that the content of total P,inorganic P, organic P in vegetable soil was 2.7～14.0 times as much as in cultivated soil.The percent of Olsen?P to total P and Ca 2?P Ca 8?P, Al?P, Fe?P to inorganic P was higher in vegetable soil than in cultivated soil. The contend of Olsen?P,Ca 2?P, Ca 8?P, Al?P in the profile of 20～40cm,40～60cm, 60～100cm soil were accounting for 34.6%, 15.3%, 10.7% of the depth of 0～20cm soil, respectively. The contents of total phosphorus and inorganic phosphorus in the profile of 20～40cm,40～60cm, 60～100cm soil were accounting for 44.0%, 30.4%, 23.6%. The positive correlation coefficient was indicated that Olsen?P was correlated significantly to total P, inorganic?P,organic?P,Ca 2?P, Ca 8?P, Al?P, Fe?P.