城市绿地植物萱草和结缕草的抗旱性研究

 盆栽条件下对萱草（Hemerocallis fulva）和结缕草（Zoysia japonica）2种城市绿地植物采取控水方式进行水分胁迫处理，测定了土壤自然干旱胁迫过程中影响其抗旱性的主要生理生化指标，采用隶属函数法对这2种草本植物进行综合评定。结果表明：随土壤水分胁迫的加重，土壤水势和叶片水势、叶绿素含量、叶片光合及蒸腾强度均呈下降趋势，细胞膜透性增大。萱草SOD活性先升高后下降再升高，结缕草则一直呈上升趋势；两种植物的可溶性蛋白含量先下降后升高；脯氨酸含量萱草呈先升高后下降，结缕草则是先下降再升高的过程。综合评价结果表明，萱草的抗旱性大于结缕草。

Study on Drought Resistance of Two Plants of Urban Green Land: Hemerocallis fulva and Zoysia japonica

Under water-controlling treatment, drought resistance physiological characteristics of 2-year-old potted herbs of Hemerocallis fulva and Zoysia japonica under natural soil drought stress were measured and assessed by using membership function method. Results showed that: During the water-controlling course as the drought stress strengthened, the photosynthesis, transpiration rate, leaf chlorophyll content, soil water potential and leaf water potential of those plants all decreased while cytopermeability increased. Activity of superoxide dismutase (SOD) of H. fulva was in a "N" shape, and that of Z. japonica increased constantly. Soluble protein content of those two herbs first decreased and then increased. The change tendency of proline content of H. fulva first increased and then decreased, and that of Z. japonica was in a "V" shape. Comprehensive assessment of the two herbs showed that: Under drought stress, the performance of H. fulva was more excellent than Z. japonica.