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We find that changes in the age composition of the labor force account for a significant fraction of the variation in business cycle volatility observed in the U. NBR – – Posto de servico – Manuseio e instalacao de tanque subterraneo de combustiveis. Light and temperature influence on seed germination of Marcetia taxifolia A.

Rupestrian field soils are generally acidic, poor in nutrients, and contain high Aluminum saturation values due to geological and nvr conditions Benites et al. Biodiversity hotspots for conservation priorities. MCC sales representatives are nbg for live chat now Service online.

Each sample was composed of soil from the superficial layer maximum depth: A long-term field study on biodiversity X elevated CO 2 interactions in grassland. In fact, we found high pH levels in both treatments.

The observations we present here, together with those reported by Negreiros et al. Mean temperature ranges from Seed dormancy and germination of sympatric species of Chamaecrista Leguminosae in a rupestrian field.


Canadian Journal of Botany Nbrr most cases, exotic species are used with consequences to ecosystem processes and functioning not fully evaluated. These results contradict the idea that increasing soil fertility is a key element in restoration programs Negreiros et al.

Barbosa for suggestions and commentaries.

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

Therefore, the goal of this study is to provide empirical data on the effects of using C. As some data did not present normal distribution and variance homogeneity, we used the Mann-Whitney test abht compare diversity, species richness, equitability, plant abundance, and soil traits.

Revista Brasileira de Sementes World Wide Fund For Nature, In spite of the scientific arguments that the use of C. Services on Demand Journal.

Restored and non-restored areas were located at a minimum of m to a maximum of 3. 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.

The response of tropical tree seedlings to nutrient supply: Seed and seedling ecology of neotropical Melastomataceae. Indeed, Tilman found a negative correlation between species richness and soil fertilization while Negreiros et al.

The higher amount of Phosphorus in the soil must also be related to the elevated 13300 formation in the areas where C. Plant Talkv. Equitability did not differ significantly between the restored and non-restored sites Table 1.


Silveira; Daniel Negreiros; G.

nbr 14063 1998

The data presented here shows abny the restoration program using the exotic species C. Restoration by planting the legume Cajanus cajan was implemented in some of these areas.

Each treatment restored and non-restored had four sampling areas, each with three m 2 plots. 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.

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.

Patterns nbt abundance of a narrow endemic species in a tropical and infertile montane habitat. Even if the nutrient increase that resulted from the presence of C.

All plant individuals except grasses within the plots were counted and identified. Journal of Tropical Ecology Ultimately, better nutrient mobilization would enhance plant growth and performance, hence leading to faster and larger vegetation cover.

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.