Total phosphorus of soil in typical hydro-fluctuation belt and sediments in submerged area was determined in this paper through SMT and acid-soluble digestion. It is found that determination results from two methods shows characteristics of high positive correlation,and its correlation coefficient reach to 0.924 (Sig.<0.01).The ratio of determination results between two methods is in 62.8%～96.8%,and its mean value is 79.7%. This shows that extraction of phosphorus from soil through SMT could obtain most of phosphorus in soil. The method of SMT has advantages of simple operation and low requirements of experimental environment, so it is suitable for some field observation stations and small laboratories.%采用SMT法和酸溶全消解方法测定三峡库区典型消落区土壤和淹没区底泥,发现两者的测定结果高度正相关,相关系数达到0.924(Sig.<0.01).两种测试方法测定结果之间的比值在62.8%～96.8%之间,平均为79.7%,由此可见使用SMT法可浸提出土壤中绝大多数磷素.由于使用SMT法操作简单,实验环境要求低,因此适用于三峡库区野外站点和小型实验室采用.
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