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| Web URL(s): | http://www.jstor.org/stable/pdf/10.2307/2405230.pdf
Last checked: 01/14/2016
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| Publication Type:
| Refereed |
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| Author(s): | Salt, C. A.;
Kay, J. W.;
Donaldson, L.;
Woolsey, J. M. |
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| Author Affiliation: | Salt & Donaldson: Department of Environmental Science, University of Stirling, Stirling, FK9 4LA, UK Woolsey: Department of Biological and Molecular Sciences, University of Stirling, Stirling, UK. Kay: Department of Statistics, University of Glasgow, Glasgow G12 8QW, UK. |
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| Title: | The influence of defoliation intensity, season and leaf age on radiocaesium concentrations in Agrostis capillaris |
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| Section: | Original article
Other records with the "Original article" Section
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| Source: | Journal of Applied Ecology. Vol. 34, No. 5, October 1997, p. 1177-1189. |
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| Publishing Information: | Oxford, England: Blackwell Scientific Publications |
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| # of Pages: | 23 |
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| Keywords: | TIC Keywords: Defoliation; Leaf age; Radiocaesium; Agrostis tenuis; Seasonal variation; Climatic factors; Physical properties of soil; Cesium; Contamination; Grazing
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| Abstract/Contents: | "The effects of defoliation intensity, time of year and leaf age on the appearance of ¹³⁷Cs in shoots of Agrostis capillaris were studied in a pot experiment using topsoil from a peaty podzol, artificially contaminated with ¹³⁶Cs. Grazing was simulated by frequent clipping to establish swards 3 and 6 cm tall. Above-ground biomass was harvested on 10 dates from June to December and separated into five categories of leaf age. Significant differences in growth rate and ¹³⁷Cs activity concentrations were measured between swards clipped to different heights. These differences were not consistent over time, but did indicate that during the main growing season ¹³⁶Cs in actively growing tissues was higher in the less intensively defoliated plants. The effects of season and leaf age were pronounced, with activity concentrations of ¹³⁷Cs increasing rapidly in all living tissues from mid-July onwards and generally stabilizing during autumn; this occurred sooner in actively growing than in fully mature and dying tissues. In autumn, mature and dying tissues had higher contamination compared to younger tissues; the opposite was the case in summer. Dead leaves always had the lowest ¹³⁷Cs activity concentrations, up to five times lower than green leaves. Over the winter, a 29% decrease in contamination of plant biomass was measured. The ¹³⁷Cs activity concentrations in plant material clipped to maintain constant sward height were considerably higher than those in the remaining standing biomass. Since the clippings are the part of the sward most likely to be consumed by grazing animals, animals in the field would be ingesting the contaminated part of the sward. Seasonal patterns of ¹³⁷Cs contamination of vegetation are discussed in relation to climatic, soil and plant intrinsic factors." |
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| Language: | English |
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| References: | 35 |
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| Note: | Graphs
Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Salt, C. A., J. W. Kay, L. Donaldson, and J. M. Woolsey. 1997. The influence of defoliation intensity, season and leaf age on radiocaesium concentrations in Agrostis capillaris. J. Appl. Ecol. 34(5):p. 1177-1189. |
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| Web URL(s):
http://www.jstor.org/stable/pdf/10.2307/2405230.pdf
Last checked: 01/14/2016
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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MSU catalog number: S 3 .J86 |
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