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| Web URL(s): | http://www.jstor.org/stable/pdf/3072180.pdf
Last checked: 10/06/2015
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| Publication Type:
| Refereed |
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| Author(s): | Kirkham, F. W. |
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| Author Affiliation: | ADAS, Woodthorne, Wolverhampton, UK |
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| Title: | Nitrogen uptake and nutrient limitation in six hill moorland species in relation to atmospheric nitrogen deposition in England and Wales |
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| Section: | Standard papers
Other records with the "Standard papers" Section
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| Source: | Journal of Ecology. Vol. 89, No. 6, December 2001, p. 1041-1053. |
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| Publishing Information: | Blackwell Scientific Publications |
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| # of Pages: | 13 |
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| Keywords: | TIC Keywords: Nitrogen uptake; Calluna vulgaris; Molinia caerulea; Nardus stricta; Eriophorum vaginatum; Agrostis; Festuca; Nitrogen; Altitude; Temperatures; Correlation
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| Geographic Terms: | England; Wales |
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| Abstract/Contents: | "Samples of shoot tissue of six hill moorland species were obtained from upland sites in England and Wales in 1996 and 1997 and analysed for nitrogen (N) content, annual accumulated N per hectare and nitrogen to phosphorus (N:P) ratio. The species sampled were: Calluna vulgaris in four growth phases (pioneer, building, mature and degenerate), Vaccinium myrtillus, Molinia caerulea, Nardus stricta, Eriophorum vaginatum and Agrostis/Festuca. Sites dominated by each species were sampled in eight upland regions from Northumberland in the north-east to Dartmoor and Exmoor in the south-west, and shoot N variables were related to atmospheric N deposition data by regression analysis. For each species and Calluna type in each year, separate analyses were carried out against oxidized N (NOx) deposition, reduced N (NHx) and total N deposition. Shoot N variables were also tested for the influence of altitude and temperature. None of the plant tissue variables tested was significantly correlated with NHx deposition and only Nardus, N : P ratios were correlated with total N deposition. However, for all species except Nardus, Eriophorum and Molinia, shoot N concentration and/or assimilated N per hectare were significantly correlated with NOx deposition in at least one of the two years, as were N:P ratios for Calluna, Vaccinium, and Nardus. Most of the significant relationships were recorded with material sampled in 1997, rather than in 1996. In terms of increased shoot N concentration, the response of mature Calluna was lower than that shown by previous work encompassing a different range of locations in the United Kingdom. Increases in the amount of N per hectare accumulated in the current season's Calluna shoots exceeded corresponding increases in estimated annual deposition rates by several-fold, implying that N deposition has enhanced the accumulation of organic N in upland soils, leading to an increased pool of mineralizable N. Significant relationships between N deposition and N:P ratios in shoot tissue suggested that this accumulation has changed a substantial proportion of Calluna-dominated uplands from N-limited ecosystems into P-limited ones. This could favour species such as Molinia that are better adapted to P limitation." |
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| Language: | English |
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| References: | 36 |
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| Note: | Figures
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Kirkham, F. W. 2001. Nitrogen uptake and nutrient limitation in six hill moorland species in relation to atmospheric nitrogen deposition in England and Wales. J. Ecol. 89(6):p. 1041-1053. |
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| Web URL(s):
http://www.jstor.org/stable/pdf/3072180.pdf
Last checked: 10/06/2015
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Access conditions: Item is within a limited-access website |
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MSU catalog number: QH 540 .J6 |
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