豫北蔬菜保护地土壤磷素形态及其空间分布特性研究

采用蒋柏藩、顾益初无机P分级方法研究了豫北褐土多年棚龄蔬菜保护地土壤P素形态及其空间分布特性。结果表明,蔬菜保护地0 ~ 20cm土层全P、无机P、有机P、Olsen-P的含量分别为:1385.6 ~ 2896.5、1097.1 ~ 2365.7、270.0 ~ 606.9、109.8 ~ 302.4 mg/kg,Ca2-P、Ca8-P、Al-P、Fe-P、O-P、Ca10-P分别占无机P的百分比平均为:12.5 %、37.2 %、10.8 %、5.8 %、13.3 %、20.5 %,Olsen-P占全P的百分比高达4 % ~ 15 %,平均为10.6 %;土壤各形态P素主要积累在0 ~ 20 cm土层,随着深度的增加土壤全P、有机P、Olsen-P、各形态无机P均减少。

PHOSPHORUS FRACTIONS AND THEIR VERTICAL DISTRIBUTION IN VEGETABLE SOIL IN SUBURBS OF ANYANG CITY

Forms and the vertical distribution of phosphorus in vegetable soil in the northern part of Henan Province were studied by the method of phosphorus fractionation recommended by Jiang and Gu. The results showed that in the soil layer of 0~20cm, the content of total P, inorganic P, organic P and Olsen P was 1385.6~2896.5, 1097.1~2365.7, 270.0~606.9 and 109.8~302.4mg/kg, respectively, and the content of Ca2-P, Ca8-P, Al-P, Fe-P, O-P and Ca10-P accounted for 12.5%, 37.2%, 10.8%, 5.8%, 13.3% and 20.5%, respectively, of the total inorganic P. The percentage of Olsen-P to total P was very high, ranging 4%~15%, and 10.6% on average. Most of the soil P, in whatever form, was concentrated in the soil layer of 0~20cm and with the depth increasing in the soil profile, the contents of total P, organic P, inorganic P and Olsen P were all decreased.