泰兴市不同行道树叶经济谱性状对土壤重金属的响应

Response of Leaf Economic Spectral Traits of Different Street Treesto Soil Heavy Metals in Taixing City

为探究植物叶经济谱性状对城市道路不同梯度土壤重金属污染的响应,选取泰兴市不同功能区的3条道路和10种常见行道树作为研究对象,对土壤重金属含量及叶经济谱性状进行测定及分析,研究不同行道树树种对土壤重金属污染的适应能力。结果表明,行道树通过减少SLA、增加N_(mass)、调节C∶N的方式增加叶片韧性作为在重金属胁迫环境下的适应对策,但在污染较严重的环境中存在性状间关系的差异性变化;在土壤重金属环境胁迫下,香樟、银杏及红花檵木具有较好的环境适应性;鸡爪槭、南天竹及迎春适应能力较弱;金边黄杨、红叶石楠、桂花及锦绣杜鹃环境适应性较为适中。

In order to investigate the response of plant leaf economic spectrum traits to soil heavy metal pollution at different gradients on urban roads,the study selects three roads and ten common roadside trees from different functional areas of Taixing City as the research objects,and measures and analyzes the soil heavy metal content and leaf economic spectrum traits,in order to study the adaptability of different roadside tree species to soil heavy metal pollution.The results show that street trees increase leaf toughness by reducing SLA,increasing N mass,and regulating C:N as adaptive strategies under heavy metal stress environments.However,there are also differences in the relationships between traits in heavily polluted environment.Cinnamomum camphora,Ginkgo biloba,and Loropetalum chinensevar rubrum have good environmental adaptability under heavy metal environmental stress in the soil.The adaptability of Acerpalmatum,Nandinado mestifalia,and Jasminummesnyi is relatively weak.The environmental adaptability of Euonymusjaponicusvar aurea-marginatus,Photiniadomestica,Osmanthusfragrans,and Rhododendronsimsii is relatively moderate.