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Variation in vegetation cover and seedling performance of tree species in a forest-savanna ecotone

Published online by Cambridge University Press:  18 January 2019

Hamza Issifu ,
George K. D. Ametsitsi ,
Lana J. de Vries ,
Gloria Djaney Djagbletey ,
Stephen Adu-Bredu ,
Philippine Vergeer ,
Frank van Langevelde  and
Elmar Veenendaal
Hamza Issifu*
Affiliation:
Plant Ecology and Nature Conservation Group, Wageningen University, 6700 AA Wageningen, the Netherlands Department of Forestry and Forest Resources Management, University for Development Studies, P. O. Box 1882, Tamale, Ghana
George K. D. Ametsitsi
Affiliation:
Plant Ecology and Nature Conservation Group, Wageningen University, 6700 AA Wageningen, the Netherlands Forestry Research Institute of Ghana, P O. Box 63, KNUST, Kumasi, Ghana
Lana J. de Vries
Affiliation:
Plant Ecology and Nature Conservation Group, Wageningen University, 6700 AA Wageningen, the Netherlands
Gloria Djaney Djagbletey
Affiliation:
Forestry Research Institute of Ghana, P O. Box 63, KNUST, Kumasi, Ghana
Stephen Adu-Bredu
Affiliation:
Forestry Research Institute of Ghana, P O. Box 63, KNUST, Kumasi, Ghana
Philippine Vergeer
Affiliation:
Plant Ecology and Nature Conservation Group, Wageningen University, 6700 AA Wageningen, the Netherlands
Frank van Langevelde
Affiliation:
Resource Ecology Group, Wageningen University, 6700 AA Wageningen, the Netherlands School of Life Sciences, Westville Campus, University of KwaZulu-Natal, Durban 4000, South Africa
Elmar Veenendaal
Affiliation:
Plant Ecology and Nature Conservation Group, Wageningen University, 6700 AA Wageningen, the Netherlands
*
*Email: hamza.issifu@gmail.com
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Abstract

Differential tree seedling recruitment across forest-savanna ecotones is poorly understood, but hypothesized to be influenced by vegetation cover and associated factors. In a 3-y-long field transplant experiment in the forest-savanna ecotone of Ghana, we assessed performance and root allocation of 864 seedlings for two forest (Khaya ivorensis and Terminalia superba) and two savanna (Khaya senegalensis and Terminalia macroptera) species in savanna woodland, closed-woodland and forest. Herbaceous vegetation biomass was significantly higher in savanna woodland (1.0 ± 0.4 kg m−2 vs 0.2 ± 0.1 kg m−2 in forest) and hence expected fire intensities, while some soil properties were improved in forest. Regardless, seedling survival declined significantly in the first-year dry-season for all species with huge declines for the forest species (50% vs 6% for Khaya and 16% vs 2% for Terminalia) by year 2. After 3 y, only savanna species survived in savanna woodland. However, best performance for savanna Khaya was in forest, but in savanna woodland for savanna Terminalia which also had the highest biomass fraction (0.8 ± 0.1 g g−1 vs 0.6 ± 0.1 g g−1 and 0.4 ± 0.1 g g−1) and starch concentration (27% ± 10% vs 15% ± 7% and 10% ± 4%) in roots relative to savanna and forest Khaya respectively. Our results demonstrate that tree cover variation has species-specific effects on tree seedling recruitment which is related to root storage functions.

Keywords

Biomass allocationcanopy coverdrought survivalfuel loadroot starchseedling traitssoil propertiestropical trees

Information

Type
Research Article
Information
Journal of Tropical Ecology , Volume 35 , Issue 2 , March 2019 , pp. 74 - 82
Copyright
© Cambridge University Press 2019 

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References

Literature cited

Armani, M, Van Langevelde, F, Tomlinson, KW, Adu-Bredu, S, Djagbletey, GD and Veenendaal, EM (2018) Compositional patterns of overstorey and understorey woody communities in a forest–savanna boundary in Ghana. Plant Ecology and Diversity.CrossRefGoogle Scholar
Ball, DF (1964) Loss-on-ignition as an estimate of organic matter and organic carbon in non-calcareous soils. Journal of Soil Science 15, 84–92.CrossRefGoogle Scholar
Bowman, DMJS (2000) Australian Rainforests: Islands of Green in a Land of Fire. Cambridge: Cambridge University Press, 345 pp.CrossRefGoogle Scholar
Bowman, DMJS, Perry, GLW and Marston, JB (2015) Feedbacks and landscape-level vegetation dynamics. Trends in Ecology and Evolution 30, 255–260.CrossRefGoogle ScholarPubMed
Bowman, DMJS, Walsh, A and Milne, DJ (2001) Forest expansion and grassland contraction within a eucalyptus savanna matrix between 1941 and 1994 at Litchfield national park in the Australian national park in the Australian monsoon tropics. Global Ecological Biogeography 10, 535–548.CrossRefGoogle Scholar
Cardoso, AW, Medina-Vega, JA, Malhi, Y, Adu-Bredu, S, Ametsitsi, GKD, Djagbletey, G, Van Langevelde, F, Veenendaal, E and Oliveras, I (2016) Winners and losers: tropical forest tree seedling survival across a West African forest-savanna transition. Ecology and Evolution 6, 3417–3429.CrossRefGoogle Scholar
Cuni-Sanchez, A, White, LJT, Jeffrey, KJ, Calders, K, Burt, A, Disney, M, Gilpin, M and Lewis, SL (2016) African savanna-forest boundary dynamics: a 20-year study. PLoS ONE 11(6), e0156934.CrossRefGoogle ScholarPubMed
Dubois, M, Gilles, KA, Hamilton, JK, Rebers, PT and Smith, F (1956) Colorimetric method for determination of sugars and related substances. Analytical Chemistry 28, 350–356.CrossRefGoogle Scholar
Duranceau, M, Ghashghaie, J, Badeck, F, Deleens, E and Cornic, G (1999) δ13C of CO2 respired in the dark in relation to δ13C of leaf carbohydrates in Phaseolus vulgaris L. under progressive drought. Plant Cell and Environment 22, 515–523.CrossRefGoogle Scholar
Fensham, RJ, Fairfax, RJ, Butler, DW and Bowman, DMJS (2003) Effects of fire and drought in a tropical eucalypt savanna colonized by rain forest. Journal of Biogeography 30, 1405–1414.CrossRefGoogle Scholar
Geiger, EL, Gotsch, SG, Damasco, G, Haridasan, M, Franco, AC and Hoffmann, WA (2011) Distinct roles of savanna and forest tree species in regeneration under fire suppression in a Brazilian savanna. Journal of Vegetation Science 22, 312–321.CrossRefGoogle Scholar
Gignoux, J, Konate, S, Lahoreau, G, Le Roux, X and Simioni, G (2016) Allocation strategies of savanna and forest tree seedlings in response to fire and shading: outcomes of a field experiment. Scientific Reports 6, 38838.CrossRefGoogle ScholarPubMed
Gignoux, J, Lahoreau, G, Julliard, R and Barot, S (2009) Establishment and early persistence of tree seedlings in an annually burned savanna. Journal of Ecology 97, 484–495.CrossRefGoogle Scholar
Gilman, GP (1979) A proposed method for the measurement of exchange properties of highly weathered soils. Australian Journal of Soil Research 17, 129–139.CrossRefGoogle Scholar
Hawthorne, WD (1995) Ecological Profiles of Ghanaian Forest Trees. Oxford: Oxford Forestry Institute, 345 pp.Google Scholar
Hennenberg, KJ, Fischer, F, Kouadio, K, Goetze, D, Orthmann, B, Linsenmair, KE, Jeltsch, F and Porembski, S (2006) Phytomass and fire occurrence along forest–savanna transects in the Comoé National Park, Ivory Coast. Journal of Tropical Ecology 22, 303–311.CrossRefGoogle Scholar
Hennenberg, KJ, Goetze, D, Minden, V, Traore, D and Porembski, S (2005) Size class distribution of Anogeissus leiocarpus (Combretaceae) along forest-savanna ecotones in Northern Ivory Coast. Journal of Tropical Ecology 21, 1–9.CrossRefGoogle Scholar
Higgins, SI, Bond, WJ, February, EC, Bronn, A, Euston-Brown, DI, Enslin, B, Govender, N, Rademan, L, Regan, S, Potgieter, ALF, Scheiter, S, Sowry, R, Trollope, L and Trollope, WSW (2007) Effects of four decades of fire manipulation on woody vegetation structure in savanna. Ecology 88, 1119–1125.CrossRefGoogle ScholarPubMed
Hoffmann, WA, Geiger, EL, Gotsch, SG, Rossatto, DR, Silva, LCR, Lau, OL, Haridasan, M and Franco, AC (2012a) Ecological thresholds at the savanna-forest boundary: how plant traits, resources and fire govern the distribution of tropical biomes. Ecology Letters 15, 759–768.CrossRefGoogle ScholarPubMed
Hoffmann, WA, Jaconis, SY, McKinley, KL, Geiger, EL, Gotsch, SG and Franco, AC (2012b) Fuels or microclimate? Understanding the drivers of fire feedbacks at savanna–forest boundaries. Austral Ecology 37, 634–643.CrossRefGoogle Scholar
Hoffmann, WA, Orthen, B and Franco, AC (2004) Constraints to seedling success of savanna and forest trees across the savanna-forest boundary. Oecologia 140, 252–260.CrossRefGoogle ScholarPubMed
Janssen, TAJ, Ametsitsi, GKD, Collins, M, Adu-Bredu, S, Oliveras, I, Mitchard, ETA and Veneendaal, EM (2018) Extending the baseline of tropical dry forest loss in Ghana (1984–2015) reveals drivers of major deforestation inside a protected area. Biological Conservation 218, 163–172.CrossRefGoogle Scholar
Jeffery, KJ, Korte, L, Palla, F, White, LJT and Abernethy, KA (2014) Fire management in a changing landscape: a case study from Lope National Park. Parks 20, 35–48.CrossRefGoogle Scholar
Kellman, M (1985) Forest seedling establishment in Neotropical savanna: transplant experiment with Xylopia frutescens and Calophyllum brasiliense. Journal of Biogeography 12, 373–379.CrossRefGoogle Scholar
Kwesiga, F and Grace, J (1986) The role of the red/far-red ratio in the response of tropical tree seedlings to shade. Annals of Botany 57, 283–290.CrossRefGoogle Scholar
Lloyd, J, Domingues, TF, Schrodt, F, Ishida, FY, Feldpausch, TR, Saiz, G, Quesada, CA, Schwarz, M, Torello-Raventos, M, Gilpin, M, Marimon, BS, Marimon-Junior, BH, Ratter, JA, Grace, J, Nardoto, GB, Veenendaal, E, Arroyo, L, Villarroel, D, Killeen, TJ, Steininger, M and Phillips, OL (2015) Edaphic, structural and physiological contrasts across Amazon Basin forest-savanna ecotones suggest a role for potassium as a key modulator of tropical woody vegetation structure and function. Biogeosciences Discussion 12, 7879–7977.CrossRefGoogle Scholar
Markham, RH and Babbedge, AJ (1979) Soil and vegetation catenas on the forest-savanna boundary in Ghana. Biotropica 11, 224–234.CrossRefGoogle Scholar
McCook, LJ (1994) Understanding ecological community succession: causal-models and theories, a review. Vegetatio 110, 115–147.CrossRefGoogle Scholar
Mitchard, ETA, Saatchi, SS, Gerard, FF, Lewis, SL and Mier, P (2009) Measuring woody encroachment along a forest-savanna boundary in Central Africa. Earth Interactions 13, 1–29.CrossRefGoogle Scholar
Novozamsky, I, Houba, VJG, Van Eck, R and Van Vark, W (1983) A novel digestion technique for multi-element plant analysis. Communications in Soil Science and Plant Analysis 14, 239–248.CrossRefGoogle Scholar
O’Brien, MJ, Leuzinger, S, Philipson, CD, Tay, J and Hector, A (2014) Drought survival of tropical tree seedlings enhanced by non-structural carbohydrate levels. Nature Climate Change 4, 710–714.CrossRefGoogle Scholar
Okali, DUU and Dodoo, G (1973) Seedling growth and transpiration of two west African mahogany species in relation to water stress and rooting medium. Journal of Ecology 61, 421–438.CrossRefGoogle Scholar
Olsen, SR, Cole, CV, Watanabe, FS and Dean, LA (1954) Estimation of available phosphorus in soils by extraction with sodium bicarbonate. Washington, DC: U.S. Department of Agriculture, Circular 939.Google Scholar
Poulter, B, Frank, D, Ciais, P, Myneni, R, Andela, N, Bi, J, Broquet, G, Canadell, JG, Chevallier, F, Liu, YY, Running, SW, Sitch, S and Van Der Werf, GR (2014) Contribution of semi-arid ecosystems to interannual variability of the global carbon cycle. Nature 509, 600–603.CrossRefGoogle ScholarPubMed
Ruggiero, PGC, Batalha, MA, Pivello, VR and Meirelles, ST (2002) Soil-vegetation relationships in Cerrado (Brazilian savanna) and semi deciduous forest, South-eastern Brazil. Plant Ecology 160, 1–16.CrossRefGoogle Scholar
Saiz, G, Bird, MI, Domingues, TF, Schrodt, F, Schwarz, M, Feldpausch, TR, Veenendaal, EM, Djagbletey, G, Hien, F, Compaore, H, Diallo, A and Lloyd, J (2012) Variation in soil carbon stocks and their determinants across a precipitation gradient in West Africa. Global Change Biology 18, 1670–1683.CrossRefGoogle Scholar
Schwartz, D, Floresta, H, Mariotti, A, Balesdent, J, Massimba, JP and Girardin, C (1996) Present dynamics of the savanna-forest boundary in the Congolese Mayombe: a pedological, botanical and isotopic (13C and 14C) study. Oecologia 106, 516–524.CrossRefGoogle ScholarPubMed
Sokal, RR and Rohlf, FJ (1995) Biometry: The Principles and Practice of Statistics in Biological Sciences. New York: WH Freeman and Company, 859 pp.Google Scholar
Ste-Marie, C and Pare, D (1999) Soil, pH and N availability effects on net nitrification in the forest floor of a range of boreal forest stands. Soil Biology and Biochemistry 31, 1579–1589.CrossRefGoogle Scholar
Tomlinson, KW, Sterck, FJ, Bongers, F, Da Silva, DA, Barbosa, ERM, Ward, D, Bakker, FT, Van Kaauwen, M, Prins, HTT, De Bie, S and Van Langevelde, F (2012) Biomass partitioning and root morphology of savanna trees across a water gradient. Journal of Ecology 100, 1113–1121.CrossRefGoogle Scholar
Torello-Raventos, M, Feldpausch, TR, Veenendaal, E, Schrodt, F, Saiz, G, Domingues, TF, et al. (2013) On the delineation of tropical vegetation types with an emphasis on forest/savanna transitions. Plant Ecology and Diversity 6, 101–137.CrossRefGoogle Scholar
Veenendaal, EM, Ceca, G, Sykora, K, Torello-Raventos, M, Saiz, G, Davies, K, et al. (2015) Structural, physiognomic and above-ground biomass variation in savanna-forest transition zones on three continents– how different are co-occurring savanna and forest formations? Biogeosciences 12, 2927–2951.CrossRefGoogle Scholar
Veenendaal, EM, Swaine, MD, Agyeman, VK, Blay, D, Abebrese, IK and Mullins, CE (1996a) Differences in plant and soil water relations in and around a forest gap in West Africa during the dry season may influence seedling establishment and survival. Journal of Ecology 84, 83–90.CrossRefGoogle Scholar
Veenendaal, EM, Swaine, MD, Lecha, RT, Walsh, MF, Abebrese, IK and Owusu-Afriyie, K (1996b) Responses of West African forest tree seedlings to irradiance and soil fertility. Functional Ecology 10, 501–511.CrossRefGoogle Scholar
Veenendaal, EM, Torello-Raventos, M, Miranda, HS, Sato, NM, Oliveras, I, Van Langevelde, F, Asner, GP and Lloyd, J (2018) On the relationship between fire regime and vegetation structure in the tropics. New Phytologist 218, 153–166.CrossRefGoogle ScholarPubMed
Wildlife Department (1994) Kogyae Strict Nature Reserve; Development and Management Plan. Wildlife Department, Accra. 30 pp.Google Scholar
Zuur, A, Ieno, EN, Walker, N, Saveliev, AA and Smith, GM (2009) Mixed Effects Models and Extensions in Ecology with R. New York: Springer, 574 pp.CrossRefGoogle Scholar