海绵城市建设中8种华北常用园林地被植物的耐淹性研究

Study on Waterlogging Tolerance of Eight Ground Cover Plants Commonly Used in North China in Sponge City Construction

我国北方地区的多数城市都属缺水城市,而夏季的集中降雨又常常导致城市内涝。海绵城市建设可以发挥绿地在雨季的蓄水调水功能,缓解城市园林绿化缺水问题,因此在城市绿化中园林植物的耐水淹能力备受关注。选取8种华北地区常用园林地被植物进行耐淹性研究。通过连续30 d的长期水淹处理,研究了水淹过程中试验植物各项生理指标包括叶片受害指数、叶绿素含量、叶绿素荧光参数、丙二醛含量、抗氧化酶活性、可溶性蛋白含量等的变化,综合分析其水淹胁迫下的生长策略与生长适应性。同时,将叶绿素荧光成像应用于水淹胁迫下植物耐淹性的分析,印证植物生长状况的变化。结果表明,在连续30 d长期水淹的条件下,8种园林地被植物耐淹能力表现为:费菜>麦冬>狼尾草>细叶芒>野牛草>荷兰菊>地被菊>垂盆草。根据植物在水淹过程中的生理指标的动态变化与极限耐淹能力等,可为海绵城市建设中园林植物的选择提供理论建议。

Most cities in northern China are short of water but heavy rainfall in summer often leads to urban waterlogging.Sponge city construction can make green belt play the role of water storage and transfer in the rainy season and alleviate the water shortage of urban landscaping.Therefore,the water-resistant ability of garden plants in urban landscaping has attracted much attention.The waterlogging tolerance of eight species of garden ground cover plants commonly used in North China was studied.Through 30-day continuous waterlogging treatment,the changes of many plant physiological indicators during waterlogging stress including leaf injury index,chlorophyll content,chlorophyll fluorescence parameters,malondialdehyde content,antioxidant enzyme activity and soluble protein content was studied and then the growth strategy and growth adaptability under waterlogging stress were analyzed synthetically.At the same time,chlorophyll fluorescence imaging was applied to the analysis of plant submergence tolerance under waterlogging stress,which confirmed the change of plant growth status.The results showed that the waterlogging tolerance of the eight species was ranked as follows:Sedum aizoon>Ophiopogon japonicus>Pennisetum alopecuroides>Miscanthus sinensis>Buchloedactyloides>Aster novi-belgii>Chrysanthemum morifolium>Sedum sarmentosum.According to the dynamic changes of physiological indexes and the ultimate submergence tolerance of plants in the process of waterlogging,some theoretical suggestions can be provided for the selection of garden plants in sponge city construction.