Influence of Air Pollution on the Epiphytic Lichen Vegetation and Bark Properties of Deciduous Trees in the Copenhagen Area
Influence of Air Pollution on the Epiphytic Lichen Vegetation and Bark Properties of Deciduous Trees in the Copenhagen Area
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空气污染对哥本哈根地区附生地衣植被和落叶乔木树皮特性的影响
DOI：
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发表时间：
1973
期刊：
影响因子：
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通讯作者：
U. Søchting
中科院分区：
文献类型：
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作者：
I. Johnsen;U. Søchting
绘制了哥本哈根地区树木附生地衣植被图，并对其基质的pH、全硫含量和缓冲容量进行了测定。绘制了连续两个冬季的二氧化硫空气污染图。S02等值线与地衣的内部分布界限很好地吻合，表明了不同物种的特定临界S02水平。斑点柴胡Buellia startata(Hoffm.)马萨尔。对苍桑Xanthoria parietina(L.)TH.佛尔80-90 JG m-3，用于Lecanora subfusca coll.70-80、ug m-3和粉状大黄甲Physcia ferverulenta(Schreb.)汉普40，ug m-3。这些物种可作为研究区二氧化硫污染的生物评价指标。在接近市中心时，树皮性状发生了以下变化：平均pH值从5.0降至3.0，平均含硫量(干重百分比)从0.25%升至0.45？0。无论是市中心还是农村，树皮的缓冲能力都高于城市边缘的中间地带。
The epiphytic lichen vegetation of trees in the Copenhagen area was mapped, and the pH, total sulphur content and buffer capacity of its substratum were measured. The S02 air pollution during two consecutive winters was mapped. The S02 isopleths coincide well with the inner distribution limits of the lichens, indicating specific critical S02 levels for the different species. The critical level for Buellia punctata (Hoffm.) Massal. was 90-110 Iog m-3 for Xanthoria parietina (L.) Th. Fr. 80-90 jg m-3, for Lecanora subfusca coll. 70-80 ,ug m-3 and for Physcia pulverulenta (Schreb.) Hampe 40 ,ug m-3. These species were considered useful as indicators for biological evaluation of S02 pollution in the investigation area. The bark properties changed as follows on approaching the city centre: the average pH decreased from 5.0 to 3.0 whilst the average sulphur content in per cent dry weight increased from 0.25 % to 0.45 ?0. The buffer capacity of bark was higher both in the city centre and the rural districts than in the intervening area at the periphery of the city.