Case J W, Krouse H R
UNISUL (The University of Calgary Interdisciplinary Sulphur Research Group), Calgary, Canada.
Oecologia. 1980 Jan;44(2):248-257. doi: 10.1007/BF00572687.
The proportion of sulphur found in vegetation increases as an industrial sulphur dioxide emission source is approached, but this trend is modified by topographic extremes. Stable sulphur isotope analysis revealed that increased sulphur concentrations in arborcal and terricolous lichens, andPicea glauca needles were due to incorporation of sulphur emitted as sulphur dioxide by the Kaybob sour gas plant near Fox Creek, Alberta, Canada. It is confirmed thatPicea glauca gets its sulphur from both the soil and the air; arboreal lichens get their sulphur primarily from the atmosphere; and terricolous lichens get theirs from the air and particulate fallout. It is suggested that arboreal lichens selectively excrete isotopically light sulphur when thallus concentrations exceed 1,400 ppm. Accumulation of sulphur in vegetation is dependent, on fumigation episode duration, frequency, and concentration, as well as the plant's ability to avoid injury, but is not closely correlated with average sulphation rates. The implications of terrestrial moss-lichen carpet destruction is discussed.
随着靠近工业二氧化硫排放源，植被中硫的比例会增加，但这种趋势会因极端地形而改变。稳定硫同位素分析表明，乔木地衣和地生苔藓以及白云杉针叶中硫浓度的增加是由于加拿大艾伯塔省福克斯溪附近的凯博布酸性气田排放的二氧化硫中所含硫的掺入。已证实白云杉的硫来自土壤和空气；树生地衣的硫主要来自大气；地生苔藓的硫来自空气和颗粒沉降物。有人提出，当叶状体硫浓度超过1400 ppm时，树生地衣会选择性地排出同位素较轻的硫。植被中硫的积累取决于熏蒸事件的持续时间、频率和浓度，以及植物避免受伤的能力，但与平均硫化率没有密切关系。文中讨论了陆地苔藓-地衣覆盖层遭到破坏的影响。
