昆明常见园林地被植物耐旱性研究

Study on Drought Tolerance of Common Garden Ground Cover Plant in Kunming

通过盆栽4种多年生观赏地被植物,对其进行连续20d的自然失水胁迫处理,研究供试植物在干旱胁迫下的土壤相对含水量以及叶片的枯叶率、游离脯氨酸、相对电导率的变化。结果表明:在干旱胁迫下各参试植物的各指标变化显著,综合分析各指标,4种观赏植物抗旱性由强至弱排序为:松叶景天>萱草>头花蓼>紫花地丁。松叶景天、萱草具有很强的抗旱性,在园林绿化中可大力推广应用。

The drought tolerance of four perennial ground cover plants which grown in Kunming were studied, to provide the theoretical and practical references for selecting and applying of the drought tolerance plants resources in landscape planning and management. Physiological indices in leaves of these ornamental plants were continuously observed for 20 days by pot experiment under artificial water stress conditions, and changes of the plant appearance, soil relative watercontent and percentage of withered leaves, proline content, relative conductivity were measured. The results showed that physiological indices of each plants changed significantly. The drought resistance order of the four ornamental plants was that Sedum mexicanum Hemerocallis fulva Polygonum capitatum Viola philippica. Sedum rnexicanum and HemerocaUis fulva were well drought resistance plants, which should be widely used in landscape planning and management.