4种牧草苗期耐盐性比较

用不同NaCl溶液分别对梭罗草（Roegneria thoroldiana）、碱茅（Puccinellia distans）、中华羊茅（Festuca sinensis）和垂穗披碱草（Elymus nutans）进行胁迫处理,研究它们在不同质量分数的NaCl胁迫下植物组织受伤害程度、叶片的叶绿素、可溶性糖、可溶性蛋白质、游离脯氨酸的含量及过氧化物酶、过氧化氢酶活性的变化。结果表明，在盐质量分数为0.2%时，4种供试牧草的抗盐性依次为碱茅>中华羊茅>梭罗草>垂穗披碱草;在质量分数为0.4%~1.0%时，抗盐性依次为碱茅>梭罗草>中华羊茅>垂穗披碱草。

Comparison of salinity tolerance of four herbages at the seedling stage

In order to understand salinity tolerance of 4 herbages, seedlings of Roegneria thoroldiana, Puccinellia distans, Festuca sinensis and Elymus nutans were treated with different concentrations of NaCl solution; and the plant tissues damage degree, contents of chlorophyll, soluble sugar, soluble protein, free proline (Pro) and activities of peroxidase (POD), catalase (CAT) in the seedlings were measured after 7 day treatments. Results showed that the order of salt resistance of the four herbages was P.distans>F.sinensis>R.thoroldiana>E.nutans with the 0.2% of NaCl solution treatment. However, when the salt concentration increased to 0.4%~1.0%, the trend of salt resistance from strong to weak was P. distans, R. thoroldiana, F. sinensis and E.nutans.