Results 271 to 280 of about 33,155 (312)

‘Tipping points’ for the Amazon forest

Current Opinion in Environmental Sustainability, 2009
The stability of the Amazon forest–climate equilibrium is being perturbed by a number of human drivers of change (e.g. deforestation, global warming, forest fires, higher CO2 concentrations, and increased frequency of droughts and floods). Quantitative assessments for the maintenance of the tropical forest indicate that ‘tipping points’ may exist for ...
Carlos Afonso Nobre, Laura De Simone Borma   +1 more
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Apogeotropic Roots in an Amazon Rain Forest

Science, 1987
Roots of some tropical trees grow vertically upward on the stems of neighboring trees. Apogeotropic roots occur in 12 species across five families. These roots, originating as fine roots in the mineral soil, grow upward as fast as 5.6 centimeters in 72 hours.
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A Risky Forest Policy in the Amazon?

Science, 2003
In their Policy Forum “National forests in the Amazon” (30 Aug., p. [1478][1]), A. Verissimo et al. seem assured that a new system of national forests will solve the problems of uncontrolled forest exploitation in the Brazilian Amazon. Unfortunately, we are far less optimistic.
Frank D. Merry, Gregory S. Amacher, Eirivelthon Lima, Daniel C. Nepstad   +3 more
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The hidden agriculture of the Amazon forest

2020
The image of agriculture in the Amazon is often shaped by colonisation fronts encroaching on the forest. But other forms of agriculture such asthose practised by Amerindian peoples and traditional populations can help preserve the forest cover, subject to a long fallow cycle.
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Use of Passive Microwaves Over the Amazon Forest

[Proceedings] IGARSS '92 International Geoscience and Remote Sensing Symposium, 2005
In this study, an attempt is made to derive the evolution of the water status of the Amazon forest canopy over a short period, from satellite microwave radiometry. The Nimbus-7 Scanning Multichannel Microwave Radiometer (SMMR) temperature corrected tapes data are analysed for the 6.6, 10.7, 18 and 37 GHz frequencies, at daytime and nighttime, for the ...
Calvet, J.C., Wigneron, Jean-Pierre, Mougin, Éric, Kerr, Yann H., Brito, J.L.S.   +4 more
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Women of the Amazon Forest and Citizenship

Health Care for Women International, 2005
At each meeting of the International Council on Women's Health Issues (ICOWHI), an award is given to a researcher from a developing country in recognition of her work to improve health care practice in her country. The Taylor & Francis Lectureship Award is funded by the Taylor & Francis Publishing Company to help the award winner to attend the ICOWHI ...
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Leaf seasonality in Amazon forests

Science, 2016
Forest Ecology Models assume that lower precipitation in tropical forests means less plant-available water and less photosynthesis. Direct measurements in the Amazon, however, show that production remains constant or increases in the dry season. To investigate this mismatch, Wu et al.
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The Fate of the Forest: Developers, Destroyers and Defenders of the Amazon

Economic Geography, 1990
The Amazon rain forest covers more than five million square kilometers, amid the territories of nine different nations. It represents over half of the planet's remaining rain forests. But is it truly in peril? And what steps are necessary to save it? To understand the future of Amazonia, one must know how its history was forged: in the eras of large ...
Michael Eden, Susanna Hecht, Alexander Cockburn   +2 more
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Territoriality and resistance in the amazon forest

2023
Resumen Considerada uno de los mayores bienes naturales del territorio brasileño y de la humanidad, la selva amazónica sufre profundos cambios estructurales: conflictos territoriales, extracción de minerales y relación con la minería aurífera. Este artículo tiene como objetivo abordar cómo se produce la resistencia de las comunidades tradicionales en ...
Arruda, Fernanda Aparecida Antunes de, Silva, José Carlos Marinho da, Nora, Giseli Dalla   +2 more
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Primates and Fragmentation of the Amazon Forest

2003
Many areas of what was once primary Neotropical forest are now areas of deforestation, areas of habitat fragmentation, and areas of isolated forest fragments. This change in the forest is mainly attributed to increased human activity. In the case of the Brazilian Amazon, deforestation is more widespread in the states of Para and Rondonia than in ...
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