Diversity of shrub tree layer, leaf litter decomposition and N release in a Brazilian Cerrado under N, P and N plus P additions.

Autor: Jacobson TK; Departamento de Ecologia, Universidade de Brasília, Brasília, DF 70919-970, Brazil. tamiel@unb.br, Bustamante MM, Kozovits AR
Jazyk: angličtina
Zdroj: Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2011 Oct; Vol. 159 (10), pp. 2236-42. Date of Electronic Publication: 2010 Nov 13.
DOI: 10.1016/j.envpol.2010.10.019
Abstrakt: This study investigated changes in diversity of shrub-tree layer, leaf decomposition rates, nutrient release and soil NO fluxes of a Brazilian savanna (cerrado sensu stricto) under N, P and N plus P additions. Simultaneous addition of N and P affected density, dominance, richness and diversity patterns more significantly than addition of N or P separately. Leaf litter decomposition rates increased in P and NP plots but did not differ in N plots in comparison to control plots. N addition increased N mass loss, while the combined addition of N and P resulted in an immobilization of N in leaf litter. Soil NO emissions were also higher when N was applied without P. The results indicate that if the availability of P is not increased proportionally to the availability of N, the losses of N are intensified.
(Copyright © 2010 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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