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| DOI: | 10.1111/1365-2745.12010 |
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| Web URL(s): | http://onlinelibrary.wiley.com/doi/10.1111/1365-2745.12010/full
Last checked: 01/28/2013
Access conditions: Item is within a limited-access website
http://onlinelibrary.wiley.com/doi/10.1111/1365-2745.12010/pdf
Last checked: 01/28/2013
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| Publication Type:
| Refereed |
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| Author(s): | Dohn, Justin;
Dembélé, Fadiala;
Karembé, Moussa;
Moustakas, Aristides;
Amévor, Kosiwa A.;
Hanan, Niall P. |
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| Author Affiliation: | Dohn: Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO; Dembélé: Institut Polytechnique Rurale de Formation et de Recherche Appliqué (IPR/IFRA) de Katibougou, Koulikouro, République du Mali; Karembé and Amévor: Faculté des Sciences et Techniques, Université de Bamako, Colline de Badalabougou, Bamako, République du Mali; Moustakas: School of Biological & Chemical Sciences, Queen Mary, University of London, London and Institute of Integrative and Comparative Biology, Faculty of Biological Sciences, University of Leeds, Leeds, UK; Hanan: Geographic Information Science Center of Excellence, South Dakota State University, Brookings, SD |
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| Title: | Tree effects on grass growth in savannas: Competition, facilitation and the stress-gradient hypothesis |
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| Section: | Plant population and community dynamics
Other records with the "Plant population and community dynamics" Section
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| Source: | Journal of Ecology. Vol. 101, No. 1, January 2013, p. 202-209. |
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| Publishing Information: | Oxford, England, United Kingdom: Blackwell Scientific Publications |
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| # of Pages: | 8 |
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| Related Web URL: | http://onlinelibrary.wiley.com/doi/10.1111/1365-2745.12010/abstract
Last checked: 01/28/2013
Notes: Abstract only
http://onlinelibrary.wiley.com/store/10.1111/1365-2745.12010/asset/supinfo/jec12010-sup-0001-TableS1-S2.xls?v=1&s=79342e337b92cb2239b1fb7bcc6fcef2712d5558
Last checked: 02/04/2013
Requires: Microsoft Excel
Access conditions: Document is within a limited-access website
Notes: Data sources for subcanopy to open-grassland herbaceous biomass ratios and soil and leaf matter nutrient ratios
http://onlinelibrary.wiley.com/store/10.1111/1365-2745.12010/asset/supinfo/jec12010-sup-0002-AppendixS1-FigS1.doc?v=1&s=0b007e0850635a8d7e477fa41b39d155a9198b91
Last checked: 02/04/2013
Requires: Microsoft Word
Access conditions: Document is within a limited-access website
Notes: Results of precipitation over percent evapotranspiration (PPT/PET) analysis |
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| Keywords: | TIC Keywords: Environmental stress; Nutrient uptake; Stress-gradient hypothesis; Tree environmental effects
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| Abstract/Contents: | "The stress-gradient hypothesis (SGH) predicts an increasing importance of facilitative mechanisms relative to competition along gradients of increasing environmental stress. Although developed across a variety of ecosystems, the SGH's relevance to the dynamic tree-grass systems of global savannas remains unclear. Here, we present a meta-analysis of empirical studies to explore emergent patterns of tree-grass relationships in global savannas in the context of the SGH. We quantified the net effect of trees on understorey grass production relative to production away from tree canopies along a rainfall gradient in tropical and temperate savannas and compared these findings to the predictions of the SGH. We also analysed soil and plant nutrient concentrations in subcanopy and open-grassland areas to investigate the potential role of nutrients in determining grass production in the presence and absence of trees. Our meta-analysis revealed a shift from net competitive to net facilitative effects of trees on subcanopy grass production with decreasing annual precipitation, consistent with the SGH. We also found a significant difference between sites from Africa and North America, suggesting differences in tree-grass interactions in the savannas of tropical and temperate regions. Nutrient analyses indicate no change in nutrient ratios along the rainfall gradient, but consistent nutrient enrichment under tree canopies. Synthesis. Our results help to resolve questions about the SGH in semi-arid systems, demonstrating that in mixed tree-grass systems, trees facilitate grass growth in drier regions and suppress grass growth in wetter regions. Relationships differ, however, between African and North American sites representing tropical and temperate bioclimates, respectively. The results of this meta-analysis advance our understanding of tree-grass interactions in savannas and contribute a valuable data set to the developing theory behind the SGH." |
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| Language: | English |
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| References: | 58 |
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| Note: | Figures
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dohn, J., F. Dembélé, M. Karembé, A. Moustakas, K. A. Amévor, and N. P. Hanan. 2013. Tree effects on grass growth in savannas: Competition, facilitation and the stress-gradient hypothesis. J. Ecol. 101(1):p. 202-209. |
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| DOI: 10.1111/1365-2745.12010 |
| Web URL(s):
http://onlinelibrary.wiley.com/doi/10.1111/1365-2745.12010/full
Last checked: 01/28/2013
Access conditions: Item is within a limited-access website
http://onlinelibrary.wiley.com/doi/10.1111/1365-2745.12010/pdf
Last checked: 01/28/2013
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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MSU catalog number: b2218287 |
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