探究郑州市园林绿化乔木树种各器官的含碳率特征,为郑州市园林绿化中造林固碳树种的选择和政策制定提供依据。以悬铃木、杨树、白玉兰、银杏、紫叶李、日本晚樱、山楂、山桃、桂花、女贞、广玉兰、雪松、枇杷、石楠等14种园林绿化树种为研究对象,采用重铬酸钾-外加热法,分别测定每个树种的树干、树枝、树叶、树皮和树根5种器官的含碳率,并分析不同树种的含碳率特征。结果表明:1)14种树种之间各器官碳含量的变化幅度为25.88%~59.15%。2)对于同一树种(以悬铃木为例),各器官之间的变异系数为7.41%~9.36%,相同器官之间的变异系数为0.16%~2.54%。3)对于不同树种,相同器官之间的变异系数为 10.44%~19.30%,各器官之间的变异系数为4.73%~22.54%;各器官平均含碳率整体表现为树干>树枝>树皮>树叶>树根,树干的含碳率明显高于其他器官。

This study explores the carbon content characteristics of various organs of landscaping tree species in Zhengzhou city.It provides a basis for selecting and formulating policy on landscaping tree species with carbon sequestration value in Zhengzhou city.The carbon content of five organs,including trunk,branches,leaves,bark,and roots,was measured using the potassium dichromate external heating method for 14 landscaping tree species,including Platanus orientalis L.,Populus L.,Michelia alba DC.,Ginkgo biloba L.,Prunus cerasifera 'Atropurpurea',Prunus serrulata var.lannesiana(Carri.)Makino.,Crataegus pinnatifida Bunge,Prunus davidiana (Carrière)Franch.,Osmanthus fragrnas(Thunb.)Lour.,Ligustrum lucidum Ait.,Magnolia grandiflora L.,Cedrus deodara(Roxb.)G.Don,Eriobotrya japonica(Thunb.)Lindl.,hotinia serratifolia(Desf.)Kalkman.The results show that:1)The variation range of carbon content in different organs among 14 tree species is 25.88% to 59.15%.2)For the same tree species(taking the example of the Platanus orientalis L.),the coefficient of variation between barious organs is 7.41% to 9.36%,and the coefficient of variation between the same organs is 0.16% to 2.54%.3)For different tree species,the coefficient of variation between the same organs is 10.44% to 19.30%,and the coefficient of variation between different organs is 4.73% to 22.54%; The overall average carbon content of variaus organ is as follows:trunk>branches>bark>leaves>roots,and the carbon content of the trunk is significantly higher than others.