Critérios ecológicos para o desenvolvimento agrícola das terras-firmes da Amazônia

Schubart, Herbert O. R.

doi:10.1590/1809-43921977074559

Cited by 23 publications

(6 citation statements)

References 1 publication

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“…In recent years widespread concern about the influence of man on the Amazonian ecosystem has been expressed, notably the rapid deforestation (Kerr 1977, Salati & Vose 1984, Schubert 1977, Sioli 1975, Walker & Franken 1983. Due to its dependence on allochthonous input from the forest, the aquatic community of blackwater streams can be expected to be highly vulnerable to deforestation.…”

Section: Amazonian Blackwater Stream Communitymentioning

confidence: 99%

On the leaf litter community of the Amazonian blackwater stream Tarumazinho

Henderson¹,

Walker

1986

J. Trop. Ecol.

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A study of the benthic leaf litter community of the Tarumazinho, a central Amazonian stream (03° S, 60° W) is presented. This small tributary of the Rio Negro is of the blackwater type with a very low nutrient content. The sampling stations were towards the mouth of the tributary where it flowed through annually inundated forest and the work was carried out during the low water season. Previous studies concluded that these acid waters were of very low productivity and held impoverished faunas. However, this study showed that leaf litter banks held a diverse aquatic community of unexpectedly high biomass. This was because the banks supplied food and shelter and were available during the low water period when other habitats had dried out. The macrofauna was dominated by fish and shrimps. From an examination of gut contents a food web was produced. Primary consumers were found to take mainly detritus and fungi and it was concluded that allochthonous inputs were the main source of energy and nutrients. No feeding specialists were found and all the predators took prey from more than one trophic level.

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Section: Amazonian Blackwater Stream Communitymentioning

confidence: 99%

On the leaf litter community of the Amazonian blackwater stream Tarumazinho

Henderson¹,

Walker

1986

J. Trop. Ecol.

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“…There is a danger that the region may develop into a new 'dust bowl'?dust, formerly unknown in Amazonia, is already common on the new roads during the dry season. Also, formerly porous forest soil is compacted by deforestation (Schubart, 1977). Through general and especially slope clearing, deforestation increases surface runoff.…”

Section: Surface Erosion and Compaction Of The Soilmentioning

confidence: 99%

The Effects of Deforestation in Amazonia

Sioli¹

1985

The Geographical Journal

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“…This excludes the non-establishment economics which is environmentally greatly more meaningful, such as steady-state economics and "improvement rather than growth'-as expressed, for example, by K. Boulding, H. E. Daly, N. Georgescu-Roegen, E. J. Mishan, et al While this is more significant to society, it is not the topic that is addressed in this paper. 4 World distribution and general information of the disappearing TRF: Bastos et al (1974), Persson (1974), Brunig (1975), Moraes (1975), Bene et al (1976), Schubart et al (1976), Sommer (1976), Schubart (1977Schubart ( , 1978, UNESCO (1978), Brown (1979), andU.S. Interagency Task Force (1979).…”

Section: Appendixmentioning

confidence: 99%

Environmental Ranking of Amazonian Development Projects in Brazil

Goodland

1980

Envir. Conserv.

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The premise of an Amazonia full of immensely rich potentialities awaiting development to yield copious and abundant profit and lasting benefit, has only recently emerged as being tragically false. The most important environmental consideration in Amazonian discussions has been to convince the controllers of the enormous risks of the prevailing course of development.People in Brazil and elsewhere who were concerned with various foreseeable dangers, intensified efforts to persuade the Government about them when the Transamazonian Highway programme was announced in June 1970. This programme, and the associated colonization scheme in 100-km strips on either side of the road network, subsequently was largely abandoned or postponed, as the harvests failed and roads deteriorated. The next development thrust—agro-industrial livestock—was even more damaging, and so the environmental movement in Brazil grew. Almost simultaneous announcements towards the end of the Geisel Government, of accelerated emancipation of Amerindians and risk-contracts to extract timber on unprecedented scales with no limit placed on area, were shelved with the change in government early in 1979 (cf. Schmithusen, 1978).

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Critérios ecológicos para o desenvolvimento agrícola das terras-firmes da Amazônia

Cited by 23 publications

References 1 publication

On the leaf litter community of the Amazonian blackwater stream Tarumazinho

On the leaf litter community of the Amazonian blackwater stream Tarumazinho

The Effects of Deforestation in Amazonia

Environmental Ranking of Amazonian Development Projects in Brazil

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