北方耕地和蔬菜保护地土壤磷素状况研究

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 0～20cm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-P含量的降低值

Fractions of phosphorus in cultivated and vegetable soils in northern China

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 Ca₂-P Ca₈-P, Al-P, Fe-P to inorganic P was higher in vegetable soil than in cultivated soil. The contend of Olsen-P,Ca₂-P, Ca₈-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,Ca₂-P, Ca₈-P, Al-P, Fe-P.