岩溶区与非岩溶区稻田土壤磷含量与碱性磷酸酶活性比较

Comparison of soil phosphorus content and alkaline phosphatase activity in paddy fields in karst and non karst areas

为探究稻田土壤磷含量与土壤磷酸酶之间的关系,本研究以桂林毛村岩溶区试验场中岩溶区和非岩溶区的稻田耕层土壤为研究对象,对土壤总磷、速效磷、无机磷组分和碱性磷酸酶活性进行研究。结果表明:岩溶区总磷含量缺乏,速效磷含量丰富,无机磷组分主要为Fe-P、Ca8-P和Ca10-P,碱性磷酸酶活性为0.76~1.27 mg∙kg^(-1);非岩溶区总磷含量极缺,速效磷含量中上,无机磷组分主要为Fe-P、Ca10-P和Al-P,碱性磷酸酶活性为0.06~0.35 mg∙kg^(-1);岩溶区土壤总磷和速效磷的含量与碱性磷酸酶活性显著高于非岩溶区。相关性分析表明:岩溶区和非岩溶区的碱性磷酸酶活性均与速效磷含量呈极显著负相关;在岩溶区,Fe-P含量与碱性磷酸酶活性呈显著正相关;而在非岩溶区,总磷、Ca8-P和Al-P含量均与碱性磷酸酶活性呈极显著负相关。研究表明,速效磷和无机磷组分可能是引起岩溶区和非岩溶区土壤碱性磷酸酶活性差异的重要因素。

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.