Abstract
The Cerrado, Brazilian savanna, is characterized by high radiation and dystrophic soils. Seedlings of woody species must compete effectively for resources belowground in order to establish in the herbaceous matrix. Few studies focus on the dynamics of herbaceous and woody juvenile plants and their competitive strategies, especially under increasing nitrogen (N) availability. In the present study, seedlings of three woody species, Eugenia dysenterica, Magonia pubescens and Enterolobium gummiferum were grown with or without the dominant grass in Cerrado areas of central Brazil, Echinolaena inflexa. Half of the pots were exposed to N additions equivalent to a deposition of 20 kg N-NO3NH4 ha−1 year−1. The N induced responses of plants growing under intra and interspecific competition were analyzed, with special attention to plasticity of root biomass and morphology. One year after the beginning of the experiment, the fresh and dry biomass of roots and shoots were weighted. Before drying, total length, surface area and diameter of roots were determined. Interspecific competition tended to reduce root and shoot biomass of all plants. However, effects of competition with E. inflexa were more obvious on root morphology, being total root and fine root length diminished in two of the woody species in the absence of N addition. The enhancement of N availability, in general, minimized the effects of competition, increasing the potential competitiveness of some woody species due to changes in total fine root length and biomass. The results provide indication that competition between saplings of woody plants and grasses could be an important factor driving plant allometry and morphology during the first stages of development in Cerrado environments. The responsiveness of plants to N deposition seemed to depend, in part, on the type of competition (intra- or interspecific), what should be taken into account in models of vegetation dynamics in response to nutrient deposition.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Asman, W. A. H., Sutton, M. A., & Schørring, J. K. (1998). Ammonia: Emission, atmospheric transport and deposition. New Phytologist, 139, 27–48.
Bobbink, R., Hornung, M., Roelofs, J. G. M. (1998). The effects or air-borne nitrogen pollutants on species diversity in natural and semi-natural European vegetation. Journal of Ecology, 86, 717–738.
Fabian, P., Kohlpaintner, M., & Rollenbeck, R. (2005). Biomass burning in the amazon—Fertilizer for the mountaineous rain forest in ecuador. Environmental Science and Pollution Research, 12, 290–296.
Goulding, K. W. T., Bailey, N. J., Bradbury, N. J., Hargreaves, P., Howe, M., Murphy, D. V., Poulton, P. R., & Willison, T. W. (1998). Nitrogen deposition and its contribution to nitrogen cycling and associated soil processes. New Phytologist, 139, 49–58.
Grams, T. E. E., & Andersen, C. P. (2007). Competition for resources in trees: Physiological versus morphological plasticity. Progress in Botany, 68, 356–381.
Harmens, H. Stirling, C. M., Marshall, C., & Farrar, J. F. (2000). Is partitioning of dry weight and leaf area within Dactylis glomerata affected by N and CO2 Enrichment? Annals of Botany, 86, 833–839.
Kozovits, A. R., Matyssek, R., Blaschke, H., Gottlein, A., & Grams, T. E. E. (2005). Competition increasingly dominates the responsiveness of juvenile beech and spruce to elevated CO2 and/or O3 concentrations throughout two subsequent growing seasons. Global Change Biology, 11, 1387–1401.
Kozovits, A. R., Bustamante, M. M. C., Garofalo, C. R., Bucci, S., Franco, A. C., Goldstein, G., & Meinzer, F. C. (2007). Nutrient resorption and patterns of litter production and decomposition in a Neotropical Savanna. Functional Ecology, 21, 1034–1043.
Luedemann, G. (2001). Efeito da adição de nutrientes ao solo pobre plantas rasteiras de um cerrado stricto sensu. Dissertação de Mestrado, Departamento de Ecologia—Universidade de Brasília.
Simpson, P. L. J. (2002). Crescimento e fenologia foliar de espécies lenhosas de uma área de cerrado stricto senso submetida a fertilização. Tese de mestrado. Universidade de Brasília.
Vitousek, P. M., Aber, J. D., Howarth, R. W., Likens, G. E., Matson, P. A., Schindler, D. W., Schlesinger, W. H., & Tilman, D. G. (1997). Human alteration of the global nitrogen cycle: Sources and consequences. Ecological Applications, 7, 737–750.
Zak, D. R., Pregitzer, K. S., Curtis, P. S., Vogel, C. S., Holmes, W. E., & Ussenhop, J. (2000). Atmospheric CO2, soil-N availability, and allocation of biomass and nitrogen by Populus tremuloides. Ecological Applications, 10, 34–46.
Acknowledgments
We would like to thank then UnB Ecology Lab staff for valuable help. We also would like to thank the administration and staff of Experimental Station of the UnB and of the Ecological Reserve of IBGE. This study was funded by the Graduate Program in Ecology of Tropical Biomes of the Universidade Federal de Ouro Preto, CNPq (474071/2006.5) and LBA-NASA (ND-07).
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2014 Springer Science+Business Media Dordrecht
About this chapter
Cite this chapter
Miranda, V., Kozovits, A., Bustamante, M. (2014). Competition Alters Responses of Juvenile Woody Plants and Grasses to Nitrogen Addition in Brazilian Savanna (Cerrado). In: Sutton, M., Mason, K., Sheppard, L., Sverdrup, H., Haeuber, R., Hicks, W. (eds) Nitrogen Deposition, Critical Loads and Biodiversity. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-7939-6_22
Download citation
DOI: https://doi.org/10.1007/978-94-007-7939-6_22
Published:
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-007-7938-9
Online ISBN: 978-94-007-7939-6
eBook Packages: Earth and Environmental ScienceEarth and Environmental Science (R0)