<正>研究了3种暖季型草坪草在土壤盐分胁迫时，根、茎、叶中5种金属离子含量的变化。结果表明：3种暖季型草坪草根、茎、叶的Na+含量均随盐分胁迫的加重而上升。同一处理，假俭草中的Na+含量高于结缕草和沟叶结缕草；2～6g/kgNaCl浓度处理下，结缕草与沟叶结缕草的Na+含量差异不明显；8g/kgNacl处理时，结缕草的Nal+含量高于沟叶结缕草。结缕草和沟叶结缕草受到盐分胁迫时，能维持较高的K+含量，这可能是耐盐性较强的原因之一。而假俭草在盐分胁迫下K+浓度下降，抗盐能力较差。因此，可以K叶。含量、Na+含量、Fe+含量、K+与Na+含量比、RS（K+，Na+等指标的变化趋势来衡量草坪草的耐盐性能。此次试验中，抗盐性最强的是沟叶结缕草。其次是结缕草，假俭草抗盐能力最弱。

In order to discuss the dormancy characteristics of Cyclocarya paliurus seeds, the seed coat structure of this tree and its effects on the water permeability were studied. The results showed that in. the seed coat of C. paliurus consists of three layers, i. e., external, middle, and inner seed coat. The epidermis of external seed coat is cutinized, and the middle seed coat is phellem, and the inner seed coat is lignified and hard. All these characteristics show a hindrance and permeability barrier in the seed coat of C. paliurus, preventing the water and gas exchanging and resulting in blocking germination. Compared to the seeds in control, the seeds treated by concentrated sulphuric acid absorbed more water and the speed of water permeation was more quickly. However, the embryos of untreated seeds also absorbed some water in the water absorption experiment.Therefore, the permeability of the seed coat to water may not be a main reason to cause the seed dormancy of C. paliurus. The mechanical restraint of seed coat to radicel growing may be the main reasons.