| |
| Web URL(s): | http://onlinelibrary.wiley.com/doi/10.1111/j.0021-8901.2004.00955.x/epdf
Last checked: 09/29/2015
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
|---|
| Publication Type:
| Refereed |
|---|
| Author(s): | Terry, A. C.;
Ashmore, M. R.;
Power, S. A.;
Allchin, E. A.;
Heil, G. W. |
|---|
| Author Affiliation: | Terry, Ashmore, and Allchin: Department of Geography and Environmental Science, University of Bradford, Bradford, West Yorkshire, United Kingdom; Terry, Power, and Allchin: Department of Environmental Science and Technology, Imperial College of London, Silwood Park Campus, Ascot, Berkshire, United Kingdom; Heil: Faculty of Biology, Universiteit of Utrecht, Utrecht, the Netherlands |
|---|
| Title: | Modelling the impacts of atmospheric nitrogen deposition on Calluna-dominated ecosystems in the UK |
|---|
| Source: | Journal of Applied Ecology. Vol. 41, No. 5, October 2004, p. 897-909. |
|---|
| Publishing Information: | Oxford, England: Blackwell Scientific Publications |
|---|
| # of Pages: | 13 |
|---|
| Keywords: | TIC Keywords: Calluna vulgaris; Deschampsia flexuosa; Molinia caerulea; Comparisons; Models; Ecosystems; Environmental management; Nitrogen
|
|---|
| Cultivar Names: | Calluna vulgaris |
|---|
| Geographic Terms: | United Kingdom |
|---|
| Abstract/Contents: | "1. The increased deposition of nitrogen (N) from the atmosphere over the last century has been associated in Europe with changes in the species composition, including replacement of characteristics ericaceous shrubs such as Calluna vulgaris by grasses in healthlands and moorlands. However, these changes may also be associated with changes in management practices and environmental stresses, which may interact with changes in N deposition. Policies have now been implemented to reduce N deposition, but whether, and over what time scale, changes in vegetation composition will be reversed is uncertain. 2. A model was developed to simulate competitive growth between Calluna vulgaris and the grass species Deschampsia flexuosa and Molinia caerulea, driven by light and N availability. The model was parameterized for application to UK heath and moorland systems, and tested using a synthesis of data from 10 years of three field manipulation experiments in the UK. New routines to stimulate management (burning, mowing, sheep grazing) were incorporated, and the model included a stochastic treatment of heather beetle Lochmaea suturalis responses. The effects of increases and decreases in N deposition over a period of 250 years were simulated under different management regimes. 3. Model runs demonstrated that changes in species composition in response over several decades and management cycles. The simulations showed a strong effect of management intesity, and in particular litter removal, in modifying the long-term impact of N deposition: recovery if Calluna dominance in lowland heaths was predicted within two to three decades of a decrease in N deposition under high-intensity management, but over five decades under low-intensity management. The timing of outbreaks of heather beetles, which were modelled stochastically, also had a strong effect on the balance between Calluna and grass species. Sensitivity analysis demonstrated the importance of mineralization rates, and Calluna growth rates and mortality rates, in influencing model outcomes, and also demonstrated significant interactions between these three factors and the probability of heather beetle outbreaks. 4.Synthesis and applications. Using a simulation model of competition between heath and grasses for light nad N, scenarios were run for 250 years. Nitrogen deoposition above 30 kg ha year-1 initially increased Calluna biomass, consistent with field experiments, but after several decades led to grass dominance. The effect of N deposition depended on grazing pressure and the degree of litter removal through mowing, burning or sod-cutting. The benefits of policies to reduce N deposition, in terms of restoring heather dominance, may only be realized after several decades, and active site management may be needed to capture the full benefits of such policies." |
|---|
| Language: | English |
|---|
| References: | 34 |
|---|
| Note: | Summary appears as abstract
Tables
Graphs
Charts |
|---|
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Terry, A. C., M. R. Ashmore, S. A. Power, E. A. Allchin, and G. W. Heil. 2004. Modelling the impacts of atmospheric nitrogen deposition on Calluna-dominated ecosystems in the UK. J. Appl. Ecol. 41(5):p. 897-909. |
| Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=112357 |
| If there are problems with this record, send us feedback about record 112357. |
| Choices for finding the above item: |
|---|
| Web URL(s):
http://onlinelibrary.wiley.com/doi/10.1111/j.0021-8901.2004.00955.x/epdf
Last checked: 09/29/2015
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
| 
MSU catalog number: S 3 .J86 |
| Find from within TIC:
Digitally in TIC by record number. |
| Request through your local library's inter-library loan service (bring or send a copy of this TGIF record) |
