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Seed size and shade-tolerance: The observations we present here, together with those reported by Negreiros et al. International Journal of Ecology and Environmental Sciences Each sample was composed of soil from the superficial layer maximum depth: Distribution of non-native invasive species and soil properties in proximity to paved roads and unpaved roads in a quartzitic mountainous grassland of southeastern Brazil rupestrian fields.

The data contribute jbr further studies focusing the propagation of M. The rupestrian fields of the southeastern Brazil are composed of a mosaic of vegetation types, from which we barely know the 1300 of species and some natural history.

In fact, we found high pH levels in both treatments. Contrary to the expectations, soil enhancement in the quartzitic soil poor in nutrients in the rupestrian fields can facilitate the invasion by exotic plants, which are not adapted to the lack of nutrients.

Similarity abbnt small and varied from 0 to 0. Deeper understanding of the role of commonly used practices and exotic species in the restoration of Brazilian vegetation is urgently needed because tropical vegetations present different species composition structure and functional properties.

Seed size, seed germination and seedling survival of Brazilian tropical tree species differing in successional status. How to cite this article.


Biodiversity hotspots for abjt priorities. All monitored areas were located from five to fifty meters from the road. The level of Phosphorus found in the restored areas was higher then the level reported by Marques and Negreiros et al.

In addition, restoring procedures are generally associated with calcium and phosphate input Embrapa,which can also explain the higher amount of phosphorus in the areas where C.

To test the influence of C. NBR nbr III ; Ker, F. Tibouchina pulchra Cogn e Tibouchina granulosa Cogn. Under such a scenario, C. The region is characterized by mesothermic climate, with dry winters and wet summers.

A long-term field study on biodiversity X elevated CO 2 interactions in grassland. Each treatment restored and non-restored had four sampling areas, each with three m 2 plots.

nbr 14063 1998

Botanical description of selected pigeonpea pure lines. MCC sales representatives are available for live chat now Service online.

This highway was restored in and the pigeon pea, Cajanus cajan Fabaceaewas used to facilitate the succession process.

Restoration must take into account previous knowledge and idiosyncrasies of each vegetation nbf site. Barbosa for suggestions and commentaries. Natural tropical ecosystems are formed by numerous types of vegetation in which species composition and selective pressures imposed by both, biotic and abiotic factors, may be singular. The quantity of magnesium found in this study was lower than that reported by Marques et al. The data presented here shows that the restoration program using the exotic species C.

Perhaps, the use of alien sun-plants in forest ecosystems would have reduced impacts in the community, as it is expected that these species became extinct as the native trees grow.


Unexpected effects of pigeon-peas (Cajanus cajan) in the restoration of rupestrian fields

In spite of the scientific arguments 1330 the use of Ant. Germination of seeds of tropical pioneer species under controlled and natural conditions. When only the areas restored with C.

Silveira; Daniel Negreiros; G. Impacts originating from mining, road construction, pasture establishment, tourism, and periodic fires, have been the main source of soil erosion, species extinction, and alien species invasion Viana et al. Patterns of seed longevity and germination in the tropical rain forest.

Canadian Journal of Botany To evaluate the influence of Phosphorus and Magnesium on the plant abundance and species richness we used a Pearson correlation Zar, I ; Fernandes, G I.

All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License. The Young, the Old, and the Restless: Casual observations indicate that under larger density, C. Seedling growth and biomass allocation of endemic and threatened shrubs of anbt fields.

Ignoring this fact, environmental agencies have broadly allowed the use of exotic species, despite awareness of the impacts of invasive species on local flora and associated fauna.

Disturbance, diversity, and invasion: NBR – – Posto de servico – Manuseio e instalacao de tanque subterraneo de combustiveis. Annual Review of Ecology and Systematics