重要平原绿化树种香樟、水杉的生态净化功能研究

发布时间：2018-10-15 14:10

【摘要】：随着城市化迅速发展,人类活动不可避免地对城市的环境造成一定影响。作为城市绿地系统规划中的一项重要内容,绿地绿化树种的选用及配置模式的应用不仅具有美观原则,还应融入更多的生态理念。本文以桐乡市城区内道路、河道绿地绿化树种作为研究对象,对常用平原绿化树种香樟和水杉进行比较分析,通过研究这2种乔木滞纳重金属(Pb、Cd、Ni)、吸收大气污染物(SO2、NOX、氟化物)及滞尘能力,综合评价分析这2种树种的生态净化功能。研究表明:(1)不同树种对重金属和大气污染物的积累能力存在一定差异,2种树种在不同的生长环境条件下对重金属和大气污染物的积累能力也不相同。道路绿地内的水杉和香樟对Pb、Cd、Ni的积累浓度均高于河道绿地。(2)道路和河道绿地水杉对Pb、Cd、Ni的积累能力均比香樟强,香樟对SO2、NOX、氟化物的积累能力均比水杉强。(3)不同器官重金属及大气污染物积累能力存在差异。水杉各器官中重金属浓度均值高于香樟,香樟各器官中大气污染物浓度均值高于水杉。(4)道路绿地内,水杉和香樟各器官Pb和Ni浓度对比关系为树枝树叶树根树皮树干,Cd为树根树枝、树叶树皮树干;河道绿地内,各器官中3种重金属浓度对比关系为树根树枝、树叶树皮树干。不同树种各器官对3种大气污染物浓度的对比关系为:树叶树枝树根树皮树干。(5)香樟的滞尘能力较水杉强。道路绿地受污染严重,滞尘能力强的香樟更适应在道路两侧种植。
[Abstract]:With the rapid development of urbanization, human activities inevitably have a certain impact on the urban environment. As an important part of urban green space system planning, the selection of greening tree species and the application of collocation mode not only have aesthetic principles, but also should be integrated into more ecological concepts. In this paper, the greening tree species of road and channel greenbelt in Tongxiang city are taken as the research object, and the common greening trees of Camphor camphora and Metasequoia in plain are compared and analyzed in this paper. The ecological purification function of these two species of trees was evaluated by studying the absorption of atmospheric pollutants (SO2,NOX, fluoride) and the ability of dust retention. The results showed that: (1) the accumulation ability of heavy metals and atmospheric pollutants of different tree species was different, and the accumulation ability of heavy metals and atmospheric pollutants was also different between the two species under different growing environment. The accumulation of Pb,Cd,Ni by Metasequoia glyptostrobus and Cinnamomum camphora in road green space was higher than that in river greenbelt. (2) the accumulation ability of Metasequoia glyptostrobus to Pb,Cd,Ni was stronger than that of Cinnamomum camphora. The accumulation ability of Cinnamomum camphora to SO2,NOX, fluoride was stronger than that of Metasequoia glyptostroboides. (3) the accumulation ability of heavy metals and atmospheric pollutants in different organs was different. The concentrations of heavy metals in organs of Metasequoia glyptostroboides were higher than those of camphora, and the concentrations of atmospheric pollutants in organs of Cinnamomum camphora were higher than those of Metasequoia glyptostroboides. The concentrations of Pb and Ni in the organs of Metasequoia glyptostrobus and Cinnamomum camphora were compared as follows: the trunk of tree root bark of branch leaves, the trunk of bark of leaves of Cd, and the concentration of three heavy metals in each organ of river greenbelt were tree root branches and bark trunks of leaves. The relationship between the concentration of three kinds of air pollutants in different organs of different tree species was as follows: (5) the dust retention ability of Cinnamomum camphora was stronger than that of Metasequoia glyptostroboides. The road green land is polluted seriously, and the camphor with strong dust retention ability is more suitable for planting on both sides of the road.
【学位授予单位】：浙江农林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X51;X173

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