7个华南园林树种的耐盐性研究

Study on Salinity Tolerance of Seven Gardening Tree Species in South China

文章通过比较不同NaCl浓度的水培条件下红桂木(Artocarpus nitidus ssp.lingnanensis)、秋枫(Bischofiajavanica)、毛麻楝(Chukrasia tabularis var.velutina)、黄槿(Hibiscus tiliaceus)、塞楝(Khayasenegalensis)、竹柏(Nageia nagi)和蒲桃(Syzygium jambos)等7个树种的存活率和生理指标,分析其耐盐能力。结果表明:随着盐浓度的升高,各树种的存活率、PSⅡ反应中心光化学效率(Fv/Fm)均呈现下降趋势,而叶片相对电导率、叶片Na+含量呈现上升趋势;文中三个生理指标在评价耐盐性的贡献率接近;7个树种中,黄槿为强抗盐性,远高于其余树种,竹柏、塞楝为中等抗盐性;红桂木、秋枫、毛麻楝为弱抗盐性植物,蒲桃为对盐敏感植物。

The survival rates and physiological indexes of seven tree species,Artocarpus nitidus ssp.lingnanensis,Bischofia javanica,Chukrasia tabularis var.velutina,Hibiscus tiliaceus,Khaya senegalensis,Nageia nagi,Syzygium jambos were studied under different NaCl concentration treatments.The salinity tolerance were analyzed.The results showed that the survival rates and Fv/Fm declined with the increasing of the salinity stress.The leaf relative electrical conductance and Na＋ increased correspondently.The salinity tolerance of seven species was indicated as follows： Hibiscus tiliaceus was of strong salt-tolerance;Nageia nagi and Khaya senegalensis were of moderate salt-tolerance;Artocarpus nitidus ssp.lingnanensis,Bischofia javanica and Chukrasia tabularis var.velutina were of weak tolerance;Syzygium jambos was extremely sensitive to salinity.