Tolerancia a inundação e aspectos demograficos de Inga affinis Dc

AUTOR(ES)
DATA DE PUBLICAÇÃO

1990

RESUMO

Although protected by legislation since 1934 the forests along river margins, i.e. Gallery Forests, are still being cut and/or burnt in the interior of the State of São Paulo. The destriction of these forests result in irreversible environmentaI damages, such as soil erosion and silting UP the rivers and water reservoirs. The preservation and management of this ecotone relies on the knowledge of the strategies evolved by plant species to occupy this environment, and of the dynamics of the ecosystem. A preliminary survey of the margins of the Jacaré-Pepira river showed that Inga affinis DC, is abundant in river margins subjected to periodical floodings. The presence of Inga affinis assures the stability of the banks, reducing erosion and its consequences. These characteristics led us to carry a research projet with the f ollowing objectives: a) to study the spacial and age distribuition of a population of Inga affinis in the margin of the Jacaré-Pepira rlver; b) to test, in a plant nursey, the response of 5 months old plantas of Inga affinis subjected to flooding with stagnant and moving water, c) to stablish the role of adventitious roots and hypertrophic lenticels in plants subjected to flooding; d) to study, in controled conditions, the germination potencial of seeds of Inga affinis; e) to Increase the KnowIedge of the adaptive strategies evoIved by GalIery Forest trees to occupy fIood-prone areas. The spatial distribution and age structure were studied in a grid of 21 parcels, of 50m each, where alI pIants of Inga affinis were measured (height and perimeter at breast height) and maped. After one year the area was maped again to establish recruitment, growth and mortaIity. ln the first year (September), 1987) there were 232 plants present in the grid, of which 29% were seedling, 43% juvenile, 26% adult and 2% dead. In the following year (september, 1988) there were 410 plants present, of which 49% were seedlings, 26% juvenile, 16% adult and 9% dead.The date suggests that in 1987 either fruit production or germination and/or seedling estabIishement was Iower.

ASSUNTO(S)

ecologia vegetal

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