Photosynthetic traits and water use of tree species growing on abandoned pasture in different periods of precipitation in Amazonia
Pasture soils in the Amazon become unsustainable after a short period of use, typically being replaced by emergent secondary vegetation (capoeira). The aim of this research was to investigate the photosynthetic capacity and water use in the most common tree species (Vismia japurensis, Vismia cayennensis, Bellucia grossularioides, Laetia procera, and Goupia glabra) in successional chronosequence. This study was carried out in secondary vegetation area with ages that vary between 1 and 19 years. Responses of gas exchange were determined during different periods of precipitation. The gas exchange decreased with advancing age of the vegetation (1–19 years), except for G. glabra. Negative relationships of P Nmax as a function of aging observed for V. japurensis, V. cayennensis, B. grossularioides, and L. procera exhibited r 2 equal to 0.59, 0.42, 0.33, and 0.58, respectively. The species of Vismia showed higher values for photosynthetic parameters in relation to other species across the chronosequence. Overall, there were differences in gas exchange only for some species between the different periods of precipitation. Therefore, our results suggest a distinct pattern of photosynthetic responses to species in early succession. Light decrease can exert a decisive role to reduce the photosynthetic rates in secondary succession species. On the other hand, the results of WUE showed weak evidence of changes for the species during dry and rainy periods in the abandoned pasture in central Amazonia.
Additional key wordschronosequence light-response curve photosynthesis, secondary succession stomatal conductance
net photosynthetic rate
light-saturated P N
photosynthetic photon flux density
specific leaf area
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The authors thank the National Institute of the Amazon Research (MCT-INPA) for logistical support, the Project Biological Dynamics of Forest Fragments (PDBFF) for the granting of the experimental area and CAPES and CNPq for fellowships and funding for this research, and David Adams of the University of Amazon State for revising the English.
- Bentos, T.V., Mesquita, R.C.G., Williamson, G.B.: Reproductive phenology of Central Amazon. — Trop. Conservation Sci. 1: 186–203, 2008.Google Scholar
- Chauvel, A.: [The yellow oxisols, alic, clayey within ecosystems of the INPA experimental basins and neigboring region.] — Acta Amazonica 12: 38–47, 1982. [In Portuguese.]Google Scholar
- INPE: [Monitoring of the Brazilian Amazonian Forest by Satellite.] (http://www.inpe.br/noticias/noticia.php?Cod_Noticia=2175. Access: 15/07/2010), 2010. [In Portuguese.]
- Iqbal, R.M., Rao, A.-R., Rasul, E., Wahid, A.: Mathematical models and response functions in photosynthesis: an exponential model. — In: Pessarakli, M. (ed.): Handbook of Photosynthesis. Pp. 803–810. Marcel Dekker, New York — Basel — Hong Kong 1997.Google Scholar
- Moreira, M.P.: [The use of remote sensing to assess the dynamics of secondary succession in central Amazon.] — Master’s Thesis. Nat Inst. Amazon Res. — INPA. Manaus-AM-Brazil, Manaus 2003. [In Portuguese.]Google Scholar
- PDBFF: [Project Biological Dynamics of Forest Fragments, Manaus, Amazonas, Brazil.] (http://pdbff.inpa.gov.br. Access: 10/12/2008), 2008. [In Portuguese].
- Silva, C.E.M., Gonçalves, J.F.C., Feldpausch, T.R., Luizão, F.J., Morais, R.R., Ribeiro, G.O.: [Nutrient use efficiency for pioneer species grown on abandoned pastures in central Amazonia.] — Acta Amazonica 36: 503–512, 2006. [In Portuguese.]Google Scholar
- Veiga, J.B., Tourrand, J.F., Piketty, M.G., Poccard-Chapuis, R., Alves, A.M., Thales, M.C.: [Expansion and Trajectories of Cattle Ranching in Amazonian, Para, Brazil.] — UNB Ed., Brazilia 2004. [In Portuguese.]Google Scholar