摘要
为明确城市道路路口差异对行道树叶片叶绿素的影响,研究选取太原市平阳路和长风街2条城市主干道为采样点,采摘春、秋季大十字路口、小十字路口、丁字路口和非路口绿化植株叶片,测定叶片叶绿素a含量、叶绿素b含量及叶绿素总量。结果表明:(1)城市交通对行道树叶片叶绿素总量影响为冬青卫矛(EuonymusjaponicusThunb)>国槐(Sophora japonica)>毛白杨(Populusto mentosa)。冬青卫矛适宜作指示物种。(2)与清洁对照区相比,污染区国槐和毛白杨叶片的叶绿素a、叶绿素b的含量及两者比值总体呈增加态势,冬青卫矛叶片叶绿素a、叶绿素b含量则以减少为主。(3)冬青卫矛叶片的叶绿素a含量相对叶绿素b含量影响明显,表现出了较好的相关性,建议用叶绿素a含量作为污染指示指标。(4)路口差异对不同种类行道树叶片叶绿素影响未显现一致性,表明路口差异受街道走向、交通流量、扩散能力、植株株高等多因素影响。在道路不畅、车流量大的区域,应在吸尘抑毒和降低绿化高度、增加扩散能力间寻求一种最佳平衡。
9 sampling sites were set at two main roads of Pingyang Road and Changfeng Street in Taiyuan city.The content of chlorophyll a （ca）,chlorophyll b （cb） and total chlorophyll in leaves of road side trees were determined to investigate the effects of road intersection difference on chlorophyll value of roadside tree.The results show that the influence of urban transportation to chlorophyll of different species of trees followed the sequence of hollyChinese scholar treewhite poplar,the influence might be related to the height of these tree.The traffic pollution would increase the ca,cb,ca/cb value in Chinese scholar tree and white poplar,while decrease the ca,cb value in holly,influence of road intersection on different road trees did not presents consistency,chlorophyll value in roadside trees would be affected by street orientation,traffic flow,pollution diffusibility and plant height and so on,among which,pollutant emission and diffusibility hold the key.It was finally concluded that holly and chlorophyll a could be used as biomonitors and indicatior for traffic pollution.Choice of road planting species should maintain a balance between dust absorption,inhabiting bacteria and high diffusibility.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2010年第9期37-40,49,共5页
Environmental Pollution & Control
基金
山西省软科学研究项目(No.2008041032-03)
关键词
大气污染
叶绿素
城市
路口
行道树
air pollution
chlorophyll
urban
road intersection
roadside tree
作者简介
第一作者：李美平，女，1977年生，硕士研究生，助教，主要从事区域开发与可持续发展研究。
通讯作者。
