天津黄潮土剖面磷素分布特征及其影响因素研究

采用野外采样及室内分析方法,研究了不同磷素形态在旱地黄潮土0～120cm土壤剖面中的分布特征。结果表明,经过长期施肥,供试土壤剖面100～120cm的底层土壤中全磷、速效磷、各无机磷形态均有不同程度的积累。土壤剖面速效磷与全磷含量的相关系数（0.8139）达到显著水平（P〈0.05）。无机磷形态中Fe-P和O-P的含量分别达到52.03和53.57mg·kg^-1,分别高于0～20cm的表层土壤的含量,达到5%的差异显著水平。但总体上看,由于供试土壤下层质地较为粘重以及高达10%的CaCO3含量,促使磷在剖面的移动得以放缓,还不足以影响到地下水的质量。

Distribution Characteristics of Phosphorus and Its Influencing Factors in Profile of the Yellow Moist Soil in Tianjin City

The distribution characteristics of soil phosphonls at the depth of 0-120 em in yellow moist soil profile were studied through field sampling analysis in Tianjin City. Results showed that soil total P, available P, and four forms of inorganic P were all accumulated at the depth of 100-120 em after long-term fertilization, with a significant correlation coefficient of 0.8139（P〈0.05 ） between the available P and total P. The concentrations of Fe-P and O-P were 52.03 mg.kg^-1, 53.57 mg.kg^-1 respectively, higher than those at the depth of 0-20 cm, and their differences were significant at 0.05 level. Overall, the transportation of soil phosphorus in vertical direction was decreased with the increase of soil clay content and its adsorption capacity to phosphorus, further more with the CaCO3 content up to 10%, which was not enough to influence on the quality of groundwater.