碱茅成株叶片和根中的丙氨酸、谷氨酸和天冬氨酸含量较高，丙氨酸是碱茅氮化物运输和贮藏的主要形式。随着土壤中盐分含量的增加，叶片中总游离氨基酸含量不断递增，其中脯氨酸含量增加幅度最大，且脯氦酸的相对含量也较高，约占总游离氨基酸的１９％～５３％，而其它氨基酸含量变化不大；根中总游离氨基酸含量随土壤中盐度的增加而不断下降。初步分析了碱茅成株与幼苗中游离氨基酸变化的异同点。 The content of alanine, glutamic acid and aspartic acid in the leaves and roots of Alkali Mao was higher, and alanine was the main form of Alkalinia transport and storage. With the increase of soil salinity content, the content of total free amino acid in leaves increased continuously, the content of proline increased most, and the relative content of proline was higher, accounting for 19% ~ 53% of total free amino acids. While the content of other amino acids changed little. The content of total free amino acids in root decreased with the increase of salinity in soil. The similarities and differences of free amino acids in the plant and seedling of Alkali Mao were preliminary analyzed.