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| Web URL(s): | http://www.jstor.org/stable/pdf/10.2307/2404549.pdf
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| Publication Type:
| Refereed |
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| Author(s): | Harrison, A. F.;
Taylor, K.;
Hatton, J. C.;
Howard, D. M. |
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| Author Affiliation: | Institute of Terrestrial Ecology, Merlewood Research Station, Grange-over-Sands, Cumbria LA11, 6JU; and Department of Biology, University College London, Gower Street, London WC1E 6BT, UK |
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| Title: | Role of nitrogen in herbage production by Agrostis Festuca hill grassland |
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| Source: | Journal of Applied Ecology. Vol. 31, No. 2, May 1994, p. 351-360. |
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| Publishing Information: | Oxford, England: Blackwell Scientific Publications |
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| # of Pages: | 10 |
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| Keywords: | TIC Keywords: Nitrogen; Phosphorus; Agrostis tenuis; Festuca ovina; Bioassay; Turf; Altitude; Limestone; Mineralization
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| Abstract/Contents: | "The role of nitrogen (N) in limiting herbage production was assesed in an altitudinal sequence of Agrostis-Festuca grasslands in the Moor House National Nature Reserve. For most of the growing season the concentration of ammonium-N found in the soils at the times of sampling greatly exceeded that of nitrate-N. Laboratory determinations of soil N mineralization rates at field growing season temperatures showed that mineral N accumulated almost entirely as nitrate in samples from lower altitudes and as ammonium in soil samples taken at the highest altitude. A linear relationship between the mean annual concentration of N in the herbage and primary production in the four grassland sites suggests that soil N supply was a limiting factor. Application of a ¹⁵N root uptake bioassay to excised roots of Agrostis capillaris and Festuca ovina, collected from the study sites, indicated that the demand for N was inextricably linked with the demand for phosphorus (P). At the lowest altitudinal site (480 m) N supply was adequate. However, the biassay data indicate that the demand for N was high at this site, probably due to interactive effects of enhanced P status relative to swards at higher altitudes, i.e. lack of P stress induced better growth which in turn induced N stress. From the western boundary of the Moor House National Nature Reserve to the summit of Great Dun Fell, where the annual input of inorganic nitrogen in bulk precipitation and occult deposition is positively related to increasing altitude, the source of N supply far exceeded the amount of available N being released by mineralization of soil organic matter at the highest study site (747 m) during the growing season. It is suggested that N is a secondary limiting factor determining limestone grassland sward production in the Moor House National Nature Reserve." |
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| Language: | English |
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| References: | 25 |
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| Note: | Figures
Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Harrison, A. F., K. Taylor, J. C. Hatton, and D. M. Howard. 1994. Role of nitrogen in herbage production by Agrostis Festuca hill grassland. J. Appl. Ecol. 31(2):p. 351-360. |
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| Web URL(s):
http://www.jstor.org/stable/pdf/10.2307/2404549.pdf
Last checked: 01/14/2016
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Access conditions: Item is within a limited-access website |
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MSU catalog number: S 3 .J86 |
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