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| Web URL(s): | https://academic.oup.com/aob/article/80/2/205/2587643/
Last checked: 03/01/2017
Requires: PDF Reader |
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| Publication Type:
| Refereed |
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| Author(s): | Thornley, J. H. M.;
Cannell, M. G. R. |
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| Author Affiliation: | Institute of Terrestrial Ecology, Bush Estate, Penicuik, Midlothian EH26 0QB, UK |
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| Title: | Temperate grassland responses to climate change: An analysis using the Hurley Pasture Model |
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| Source: | Annals of Botany. Vol. 80, No. 2, August 1997, p. 205-221. |
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| Publishing Information: | London, Oxford University Press |
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| # of Pages: | 17 |
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| Keywords: | TIC Keywords: Carbon dioxide; Temperatures; Grasslands; Ecosystems; Responses; Carbon; Storage; Models; Climatic change
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| Abstract/Contents: | "The Hurley Pasture Model is proccess-based and couples the carbon, nitrogen, and water cycles in the soil-grass-animal system. It was used to examine the responses of grasslands in southern, lowland and northern, upland climates in Britain. Short-term response to step-wise increases in COā concentration (350 to 700 Ī½mol mol ā»Ā¹) and temperature (5Ā°C) were contrasted with long-term equilibrium (the term 'equilibrium' is equivalent to 'steady state' throughout this paper) responses and with responses to gradually increrasing [COĀ²] and temperature. Equilibrium responses to a range of climate variables were also examined. Three conclusions were drawn regarding the interpretation of experiments: (1) initial ecosystem responses to step-wise changes can be different in both magnitude and sign to equilibrium responses, and this can continue for many years; (2) grazing can drastically alter the magnitude and sign of the response of grasslands to climate change, especially rising temperatures; and (3) effects of changes in climate, especially temperature and rainfall, are likely to be highly site-specific. It was concluded that experiments should try to lessen uncertainty about processes within models rather than try to predict ecosystem responses directly. Three conclusions were also drawn about the operation of grasslands as carbon sinks: (1) increasing [COĀ²] alone will produce a carbon sink, as long as it continues to accelerate photosynthesis and increase net primary productivity; (2) by contrast, increasing temperatures alone are likely to produce a carbon source, because soil respiration is accelerated more than net primary productivity, even when assuming the same temperature function for most soil and plant biochemical processes; and (3) the net effect of projected increases in [COĀ²] and temperature is likely to be a carbon sink of 5-15 g C māā yr āā in humid, temperate grasslands for several decades, which is consistent with the magnitude of the hypothesized current global terrestrial carbon sink." |
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| Language: | English |
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| References: | 79 |
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| See Also: | Other items relating to: Carbon sequestration of turf |
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| Note: | Figures
Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Thornley, J. H. M., and M. G. R. Cannell. 1997. Temperate grassland responses to climate change: An analysis using the Hurley Pasture Model. Ann. Bot. 80(2):p. 205-221. |
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| Web URL(s):
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Last checked: 03/01/2017
Requires: PDF Reader |
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MSU catalog number: QK 1 .A53 |
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