【摘要】 测定生长在东北盐碱化草地、盐碱化程度不同的土壤上羊草(Aneurolepidium chinense(Trin.)Kitag.)的生长量,体内K~+、Na~+、脯氨酸、柠檬酸的含量及其在各器官的积累量。结果表明,羊草具有很强的适应盐碱生境的能力,在总盐量0.088%—1.63%(pH 8.3—9.8)的土壤上均能正常生长。随着土壤含盐量或Na~+不断增高,以体内积累的Na~+、脯氨酸和柠檬酸进行渗透调节。在土壤中Na~+低于20μmol/g时,羊草快速吸Na~+和排K~+。在土壤Na~+=80 μmol/g时,Na~+吸收缓慢,K~+维持在一个稳定水平,脯氨酸和柠檬酸含量明显增加。在Na~+大于80μmol/g时,Na~+和K~+的含量均变低,而有机溶质仍不断积累。K~+主要分布在代谢旺盛的幼叶中。进入体内的Na~+主要积累在根和老叶中,而脯氨酸和柠檬酸的积累主要发生在幼叶、成叶和茎中。分蘖芽具有很强的吸收与积累K~+、Na~+和脯氨酸的能力。更多还原

【Abstract】 The growth of Aneurolepidium chinense Kitag. grown on different saline soil of a Northeast grassland of China was studied and the K~+, Na~+ proline and citric acid accumulated in plants or their organs were determined . The results showed that A. chinense had a strong adaptability to saline habitat and could grow on soil with a salt content of 0. 088%—1. 63%,and pH ranging from 8. 3 to 9. 8. Sodium,proline and citric acid were accumulated by plants for osmotic adjustment when the salinity and Na~+(content of the soil increased. A. chinense absorbed Na~+ rapidly from the soil and excluded K~+ when the soil Na~+ concentration was less than 20 μmol/g. Sodium was adsorbed slowly and K~+ remained constant in plants when Na~+ concentrations of soil were 20—80 μmol/g,and proline and citric acid contents were markedly increased. Sodium and K~+ decreased slightly in plant tissue and organic solutes increased when Na~+ concentrations exceeded 80 μmol/g in soil. Most K~+ was distributed in young leaves which were metabolically active. The major sites of Na~+ accumulation were in the roots and older mature leaves; whereas proline and citric acid accumulation occurred primarily in young leaves,mature leaves and stems. Tillering buds had strong ability to absord and accumulate K~+ ,Na~+ and Proline.更多还原