成都市春季自生植物屋顶绿化固碳释氧效益研究

A Study on the Benefits of Carbon Fixation and Oxygen Releaseof Spring Spontaneous Plants for Roof Greening in Chengdu

生命力强、维护成本低的自生植物为促进城市固碳释氧提供了新路径。以成都市的20种自生植物为研究对象,在屋顶绿化进行栽植实验,采用3051D植物光合作用测定仪对植物的光合指标进行测定,结合叶面积参数等指标分析了自生植物屋顶绿化固碳释氧效益。结果表明:①自生植物的日光合变化曲线多为双峰型,马蹄金、毛花点草、茜草的日均净光合速率较高;②单位叶面积的植物固碳能力中马蹄金、车前、七星莲强于其他植物;③单位绿化面积的植物固碳能力中毛茛、酢浆草显著强于其他植物。研究结果为自生植物选择应用提供了科学依据,有助于打造高碳汇、低维护式的屋顶绿化景观。

Spontaneous plants with strong vitality and low maintenance costs provide a new path for promoting carbon sequestration and oxygen release in cities.This study conducted planting experiments on 20 species of spontaneous plants in Chengdu for roof greening,and uses the 3051D plant photosynthesis analyzer to measure their photosynthetic indicators.The carbon sequestration and oxygen release benefits of spontaneous plants in roof greening by combining leaf area parameters and other indicators are analyzed.According to the measured research results,①the diurnal photosynthetic curves of spontaneous plants are mostly bimodal,with higher daily net photosynthetic rates observed in Dichondrarepens Forst.[D.evolvulacea(L.f.)Britton],Tradescantiafluminensis Vell.,and Rubiacordifolia L..②In terms of carbon sequestration capacity per unit leaf area,Dichondrarepens Forst.[D.evolvulacea(L.f.)Britton],Plantagoasiatica L and Violadiffusa Ging are significantly stronger than other plants.③In terms of unit green area,Ranunculusjaponicus Thunb and Oxaliscorniculata L are significantly stronger than other plants.The research results provide a scientific basis for the selection and application of spontaneous plants,which helps to create a high carbon sink and low maintenance roof greening landscape.