For the tested acid soils, available Mn was divided into four chemical fractions which were readily soluble Mn> weakly absorbed Mn, specifically absorbed Mn and oxide Mn.

• 对于供试酸性土壤来说，有效锰分为易溶态锰、弱吸附态锰、专性吸附态锰和氧化锰四种化学形态，其中氧化锰和易溶态锰是其有效锰的主要存在形态(分别占有效锰总量的86.；4%25和7