Full TGIF Record # 53137
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Web URL(s):http://www.sciencedirect.com/science/article/pii/0167880995010084
    Last checked: 10/09/2015
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Publication Type:
i
Report
Author(s):Ashenden, T. W.; Bell, S. A.; Rafarel, C. R.
Author Affiliation:Institute of Terrestrial Ecology, Bangor Research Unit, University of Wales, Deiniol Road, Bangor LL57 2UP, UK
Title:Interactive effects of gaseous air pollutants and acid mist on two major pasture grasses
Source:Agriculture, Ecosystems, and Environment. Vol. 57, No. 1, April 1996, p. 1-8.
# of Pages:8
Publishing Information:Amsterdam: Elsevier Science Publishers
Keywords:TIC Keywords: Acids; Air pollutants; Interactions; Lolium perenne; Pastures
Abstract/Contents:"Plants of Lolium perenne L. (perennial ryegras) and Agrostis capillaris L. (common bent-grass) were exposed, for 18 and 22 weeks respectively, to combinations of gaseous pollutants and acid mists. The gaseous pollutant treatments were (a) charcoal filtered air, (b) 40 ppb SO₂ + 40 ppb NO₂, (c) 40 ppb O₃ with additional peaks of 2 X 3 h at 80 ppb and 1 X 1 h at 110 ppb O₃ and (d) SO₂ + NO₂ + O₃ (a combination of treatments (b) and (c)) and the mist treatments were 6 mm per week of solutions at pH 2.5, 3.5, 4.5 and 5.6. All gaseous pollution treatments resulted in substantial reductions in the dry weights of plants of L. perenne but there were less than additive effects of O₃ and SO₂ + NO₂ in the SO₂ + NO₂ + O₃ treatment. There was a stimulation in the growth of L. perenne exposed by pH 2.5 compared with less acid mists in the charcoal filtered air and O₃, but not in the SO₂ + NO₂ and SO₂ + NO₂ + O₃, gas treatments. Plants of A. capillaris were more resistant to the gas X mist treatments. There were no significant differences (P ≤ 0.05) in the weights of total shoots for plants grown in the gas exposure treatments compared with those grown in charcoal-filtered air. There was a growth stimulation for plants of A. capillarisTR exposed to pH 2.5, compared with less acid mists, in all gas treatments. For both species, all gaseous pollution treatments caused a reduction in green shoots and an increase in dead ones. The data are discussed in relation to critical levels and loads of pollutants. It is concluded that these concepts need some refinement for assessing the threat of pollutants to vegetation."
Language:English
References:41
Note:Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Ashenden, T. W., S. A. Bell, and C. R. Rafarel. 1996. Interactive effects of gaseous air pollutants and acid mist on two major pasture grasses. Agric. Ecosyst. Environ. 57(1):p. 1-8.
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Web URL(s):
http://www.sciencedirect.com/science/article/pii/0167880995010084
    Last checked: 10/09/2015
    Requires: PDF Reader
    Access conditions: Item is within a limited-access website
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