在南京自然气候、土壤条件下,对花叶蒲苇、香茅、红叶白茅、花叶芒、斑叶芒和花叶虉草六种园林常见观赏草进行了外观形态及生理生化对干旱的响应研究。结果表明:随着干旱胁迫的加重,6个草种的叶片相对含水量、叶绿素含量呈下降趋势,枯叶率、叶片细胞质膜透性、丙二醛含量均呈上升趋势,超氧化物歧化酶(SOD)活性呈先上升后下降的变化趋势。耐旱性强的草种叶片相对含水量、叶绿素含量下降较慢,枯叶率、细胞质膜透性、MDA含量上升幅度明显低于耐旱性弱的草种。相关分析表明,除SOD活性外,其余指标之间的相关性均显著,表明枯叶率可以作为评价观赏草耐旱性的形态指标。综合评价六种观赏草的耐旱性为花叶蒲苇>香茅>斑叶芒>花叶芒>花叶虉草>红叶白茅。 Under the natural climate and soil conditions in Nanjing, the appearance and physio-biochemical responses to drought were studied on the common ornamental grasses of six kinds of garden ornamental plants, such as pampas grass, citronella, the study. The results showed that with the increase of drought stress, the relative water content and the content of chlorophyll of six grass species decreased, and the rate of dry leaf, the permeability of plasma membrane and the content of malondialdehyde increased. The activities of superoxide dismutase (SOD) activity increased first and then decreased. The relative water content of leaves of the more drought-tolerant grass species, the chlorophyll content decreased slowly, the rate of dry leaves, the permeability of cytoplasmic membrane and the content of MDA increased significantly lower than that of the weak drought-tolerant grass species. Correlation analysis showed that there was a significant correlation between the other indexes except SOD activity, which indicated that the dry leaf rate could be used as a morphological index to evaluate the drought tolerance of ornamental grasses. Comprehensive evaluation of six kinds of ornamental grasses Drought resistance for the mosaic Patilise> Lemongrass> Spotted Mangmai> Mauvana> Mosaic> Chinense.