Comparison of soil phosphorus content and alkaline phosphatase activity in paddy fields in karst and non-karst areas
To study the relationship between soil phosphorus content and soil phosphatase activity,the paddy soils in the karst area(KA)and non-karst area(NKA)of the Mao Village experimental field in Guilin City were selected as research subjects.Total phosphorus,available phosphorus,inorganic phosphorus components,and alkaline phosphatase activity in the soil were investigated.The results revealed low total phosphorus content in the KA soil,with abundantly available phosphorus content characterized by Fe-P,Ca8-P,and Ca10-P as the main inorganic phosphorus components.Alkaline phosphatase activity ranged from 0.76～1.27 mg∙kg-1 in the KA soil.In contrast,the NKA soil exhibited extremely low total phosphorus content,and moderate available phosphorus content.The main inorganic phosphorus components were Fe-P,Ca10-P,and Al-P,with alkaline phosphatase activity ranging from 0.06～0.35 mg∙kg-1.The contents of total phosphorus and available phosphorus and alkaline phosphatase activity were significantly higher in the KA soil than in the NKA soil.Alkaline phosphatase activity in both the KA and NKA soils had a negative correlation with available phosphorus.In the KA soil,Fe-P content showed a significantly positive correlation with alkaline phosphatase activity,while in the NKA soil,total phosphorus,Ca8-P,and Al-P were all significantly negatively correlated with alkaline phosphatase activity.These findings suggest that available phosphorus and inorganic phosphorus fractions may be crucial factors influencing the differences in soil alkaline phosphatase activity between the KA and NKA soils.
karst areanon-karst areaalkaline phosphatasephosphorus fractionpaddy field
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