The effects of simulated urban air pollution on grass yield 2. performance of lolium perenne phleum pratense and dactylis glomerata fumigated with sulfur di oxide nitrogen di oxide and or nitrogen oxides

Lane, P.I.; Bell, J.N.B.

Environmental Pollution Series A Ecological and Biological 35(2): 97-124


Accession: 006667594

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In two 6-7 mo. experiments, L. perenne, P. pratense and D. glomerata were exposed to atmospheres containing mean concentrations of .apprx. 3.2 pphm SO2, .apprx. 2.3 pphm NO2 and 1.2 pphm NO, singly and as mixtures of SO2 + NO2 and SO2 + NO2 + NO. The levels of SO2 and NO2 were fluctuated on an hourly basis to simulate conditions in central London [England, UK] but those of NO did not successfully reflect urban levels. Whether the pollutants were applied singly or as mixtures, there were only a few effects on total shoot dry wt of any species tested. Where effects occurred, they were usually reductions in yield, but there was some evidence that SO2 + NO2 increased the total shoot dry wt of D. glomerata, even after 7 mo. fumigation. There were some pollutant-induced effects (both increases and decreases) on the proportion of dead leaves and the number of flowering shoots. All the results are discussed for their relevance to understanding the effects of SO2 and NOx in the field. During 1 winter there were reductions in growth of P. pratense when plants were exposed to the stresses of SO2 and cold winds simultaneously, but not when exposed to each stress individually.