方馨 王凯林 孙笑丛 王一涵 石福臣

摘    要：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。

关键词：海绵城市;地被植物;耐淹性;水淹胁迫;叶绿素荧光

中图分类号：Q948.1        文献标识码：A           DOI 编码：10.3969/j.issn.1006-6500.2021.07.017

Abstract：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.

Key words： sponge city; ground cover plants; waterlogging tolerance; flooding stress; chlorophyll fluorescence

園林植物在海绵城市建设中发挥着降低雨水流速、吸收雨水、净化雨水等一系列至关重要的作用，植水沟、下沉式绿地、雨水花园、屋顶绿化等许多海绵设施中都需要适宜的园林植物，尤其是下沉式绿地和雨水花园，在雨季格外需要耐淹性强抗逆性强的植物种类[1-3]。

国外海绵城市的提出和实践相对……