| 摘要: |
| 【目的】研究陕西延安15种园林树种的叶片硫含量特征，评价其吸硫能力。【方法】在陕西延安城区、城郊分别设置空气污染程度不同（重度、中度、轻度污染和对照）的样区，采集15种园林树种叶片，采用比浊法、原子分光光度计法测定15种园林树种叶片的硫含量，并计算其相对吸硫量，分析其吸硫能力的差异。【结果】不同污染状况下，同一树种的叶片硫含量和相对吸硫量均存在显著差异，表现为重度污染区＞中度污染区＞轻度污染区。同一污染状况下，不同树种叶片硫含量存在明显差异，在重度和中度污染区，垂柳、旱柳、刺槐、紫叶李的叶片硫含量均显著高于其他树种；在轻度污染区，垂柳、旱柳、紫叶小檗、臭椿叶片硫含量均显著高于其他树种。在相同污染状况下，不同树种相对吸硫量存在显著差异，在重度、中度和轻度污染状况下，垂柳、旱柳、刺槐的相对吸硫量均显著高于其他树种。根据平均污染指数可知，旱柳、垂柳和刺槐平均吸硫能力显著强于其他树种，而云杉、臭椿和侧柏的平均吸硫能力较差。【结论】在陕西延安地区进行园林绿化时，可优先选择旱柳、垂柳、刺槐等吸硫能力较强的树种。 |
| 关键词: 叶片 含硫量 相对吸硫量 平均污染指数 陕西延安 |
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| 基金项目:国家林业局林业公益性行业科研专项（201104045） |
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| Sulfur contents in foliage of 15 ornamental trees in Yan’an |
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SONG Bin,WANG De-xiang,ZHANG Yi,et al
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| Abstract: |
| 【Objective】This study aimed to determine the sulfur contents in leaves of 15 ornamental trees in Yan’an,Shaanxi and evaluate their sulfur absorption ability.【Method】Leaves of 15 ornamental trees were collected from sampling sites with different pollution degrees in suburban and urban area of Yan’an.BaSO4 turbidimetry and spectrophotometer were used to determine the sulfur contents in leaves.The relative sulfur absorption ability was examined as well.【Result】With different pollution conditions,the differences in sulfur contents and relative sulfur absorption ability of each species were significant,in an order of heavily polluted area>moderately polluted area>lightly polluted area.With same polluted conditions,the differences in sulfur contents and relative sulfur absorption ability of different species were significant.In heavily and moderately polluted areas,the sulfur contents of Salix matsudana,Salix babylonica,Robinia pseudoacacia and Prunus ceraifera cv.pissardii were significantly higher than those of other species,while in lightly polluted areas,the sulfur contents of Salix matsudana,Salix babylonica,Berberis thunbergii cv.atropurpurea and Ailanthus altissima were higher than those of other species.With same polluted conditions,the differences in relative sulfur absorption abilities of different species were significant,and the relative sulfur absorption abilities of Salix matsudana,Salix babylonica,Robinia pseudoacacia and Prunus ceraifera cv.pissardii were significant higher than those of other species in all the polluted areas.According to average contaminative index,the average sulfur absorption capacities of Salix matsudana,Salix babylonica and Robinia pseudoacacia were significantly stronger than those of other species.【Conclusion】Trees with strong sulfur absorption ability such as Salix matsudana,Salix babylonica and Robinia pseudoacacia were recommended in Yan’an,Shaanxi. |
| Key words: foliage sulfur content relative sulfur absorption ability average contaminative index Shaanxi Yan’an |
