屋顶绿化植物铺地锦竹草和佛甲草的耐热和抗旱性比较  

Comparative on the heat tolerance and drought resistance of the roof greening plants Callisia repens and Sedum lineare

作　　者：杨建峰 丁杰 梁湖清 邓铭 金海湘 冯伟 张巨明 YANG Jianfeng;DING Jie;LIANG Huqing;DENG Ming;JIN Haixiang;FENG Wei;ZHANG Juming(Guangzhou Greening Co.,Ltd,Guangzhou 510420,Guangdong,China;College of Forestry and Landscape Architecture,South China Agricultural University,Guangzhou 510642,Guangdong,China;Engineering Research Center for Grassland Science,Guangzhou 510642,Guangdong,China;Guangzhou Municipal Construction Co.Ltd.,Guangzhou 510030,Guangdong,China;Guangzhou Municipal Construction Group Co.Ltd.,Guangzhou 510030,Guangdong,China)

机构地区：[1]广州市绿化有限公司,广东广州510420 [2]华南农业大学林学与风景园林学院,广东广州510642 [3]广东省草业工程技术研究中心,广东广州510642 [4]广州市建筑集团有限公司,广东广州510030 [5]广州建筑股份有限公司,广东广州510030

出　　处：《草业科学》2023年第1期162-168,共7页Pratacultural Science

基　　金：广州市建筑集团有限公司科技计划项目([2021]-KJ023);可移动装配式节能环保屋顶绿化技术研究与应用示范(HXKJHT20211719)。

摘　　要：屋顶绿化是改善城市生态环境、减缓城市热岛效应、建设低碳城市的有效途径。高温和干旱是屋顶绿化植物面临的两大最严酷的环境胁迫。本研究以目前在华南地区屋顶绿化中广泛使用的两种植物铺地锦竹草(Callisia repens)和佛甲草(Sedum lineare)为试验材料,以温度30℃和正常浇水为对照,设置36、40、44℃连续高温5 d处理和连续干旱25 d处理,通过对其土壤含水量、植物组织含水量、相对电导率、叶绿素含量和丙二醛含量生理指标的测定与比较分析,分析其在高温和干旱胁迫条件下的生理反应,确定更适合在华南地区作屋顶绿化的植物。结果表明:两种植物在高温、干旱胁迫下的各项生理指标变化趋势基本相同;与佛甲草相比,铺地锦竹草虽然叶绿素含量较低,但组织含水量较高且较为稳定,相对电导率和丙二醛含量增幅较小,表明其耐热性和抗旱性均优于佛甲草,铺地锦竹草更适合在华南地区作屋顶绿化植物。Roof greening is an effective method of improving the urban ecological environment, decelerating the urban heat island effect, and building low-carbon cities. High temperature and drought are the two most severe environmental stresses faced by roof greening plants. Callisia repens and Sedum lineare are two roof greening plants that are widely used in South China. In this study, the two plants were used as experimental materials to study their physiological responses to high temperature and drought stress under continuous high temperature treatments at 36, 40, and 44 ℃ for 5 days and continuous drought treatment for 25 days and a control treatment at a temperature of 30 ℃ and normal watering conditions.Measurements and comparative analyses of the soil water content and physiological indexes, including the plant tissue water content, relative conductivity, chlorophyll content, and malondialdehyde content of the two plants, were performed to determine the more suitable plant for roof greening in South China. The results showed that the physiological indexes of the two plants under high temperature and drought stress conditions presented consistent changes. Compared with Sedum lineare, Callisia repens showed high and stable tissue water content lower increases in relative conductivity and malondialdehyde content, and low chlorophyll content, indicating that its heat tolerance and drought resistance were stronger relative to that of Sedum lineare. Thus, Callisia repens is more suitable for roof greening in South China.

关 键 词：屋顶绿化 铺地锦竹草 佛甲草 高温胁迫 干旱胁迫 

分 类 号：S688.4[农业科学—观赏园艺]