Abstract: Supplemented selenium in seeds can be classified as water soluble, K₂SO₄ extractable, NaOHextractable and non-extractable forms, and the main ones are NaOHextractable and water soluble Se. Se (Ⅵ) occupies a certain proportion in various forms of Se and varies with increasing supple mented Se. The proportion of various forms of Se in crop seeds is varied with supplement of Se, which can increase the amino acid content in seed and may influence its hereditary characteristics.

Key words: Supplemented selenium, Chemical forms of selenium, Amino acid, carbon metabolic index, degradation, soil microbial biomass C and N, alpine meadow, enzymes