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Interference and weed effect on seedlings of four seasonal forest tree species

Grant number: 09/00290-3
Support type:Regular Research Grants
Duration: September 01, 2009 - August 31, 2011
Field of knowledge:Biological Sciences - Ecology
Principal Investigator:Patrícia Andrea Monquero
Grantee:Patrícia Andrea Monquero
Home Institution: Centro de Ciências Agrárias (CCA). Universidade Federal de São Carlos (UFSCAR). Araras , SP, Brazil

Abstract

We aim to test hypothesis about tropical forests dynamics, which are related to restoration methods of disturbed forests from Southeastern Brazil, and the survival and growth of four native tree species from seasonal semideciduous forest communities under the use of herbicides: Acacia polyphylla DC., and Enterolobium contortisiliquum (Vell.) Morong. (Leguminosae - Papilionoidae), Ceiba speciosa (A. St.-Hil.) Ravenna, and Luehea divaricata Mart. (Malvaceae): i) There is a weed density from which native seedlings growth and survival is damage in a significative way (Brachiaria decumbens, Panicum maximum, and Commelina benghalensis); ii) Different kinds of herbicides (pre-emergents or post-emergents), at different dosages, make different effects under the weeds control: the adequate density control of weeds promotes a better development of native forest tree species; iii) Herbicides favor survival and development of seeds of native forest tree species when they are managed directlly on the restored site ("selectiviness"). (AU)