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| Thompson, Ian D; Canadian Forest Service; ian.thompson@nrcan.gc.ca; Guariguata, Manuel R.; Center for International Forestry Research (CIFOR); M.GUARIGUATA@CGIAR.ORG; Okabe, Kimiko; FFPRI Tsukuba; kimikook@ffpri.affrc.go.jp; Bahamondez, Carlos; INFOR Valdivia; cbahamon@infor.cl; Nasi, Robert; Center for International Forestry Research (CIFOR); r.nasi@cgiar.org; Heymell, Victoria; FAO Rome; Victoria.Heymell@fao.org; Sabogal, Cesar; FAO Rome; cesar.sabogal@fao.org. |
| Forest degradation is broadly defined as a reduction in the capacity of a forest to produce ecosystem services such as carbon storage and wood products as a result of anthropogenic and environmental changes. The main causes of degradation include unsustainable logging, agriculture, invasive species, fire, fuelwood gathering, and livestock grazing. Forest degradation is widespread and has become an important consideration in global policy processes that deal with biodiversity, climate change, and forest management. There is, however, no generally recognized way to identify a degraded forest because perceptions of forest degradation vary depending on the cause, the particular goods or services of interest, and the temporal and spatial scales considered.... |
| Tipo: Peer-Reviewed Synthesis |
Palavras-chave: Biodiversity; Carbon; Criteria and indicators; Forest degradation; Forest management; Remote sensing. |
| Ano: 2013 |
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| ROJAS,ISABEL; BECERRA,PABLO; GÁLVEZ,NICOLÁS; LAKER,JERRY; BONACIC,CRISTIÁN; HESTER,ALISON. |
| Human impact such as forest fragmentation and degradation may have strong effects on native and exotic plant communities. In addition, these human-caused disturbances occur mostly in lowlands producing greater fragmentation and degradation there than in higher elevations. Plant invasion should be greater in more fragmented and degraded forests and hence lowlands should be more invaded than higher elevations. In turn, native species richness should be negatively related to fragmentation and degradation and hence greater in higher elevations within a forest type or elevation belt. We assessed these hypotheses in an Andean temperate forest of southern Chile, Araucanía Region. We recorded the vascular plant composition in twelve fragments of different size,... |
| Tipo: Journal article |
Palavras-chave: Fragmentation; Forest degradation; Elevation gradient; Invasion; Plant diversity. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200006 |
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| Auler,Neiva Maria Frizon; Reis,Maurício Sedrez dos; Guerra,Miguel Pedro; Nodari,Rubens Onofre. |
| The objective of this study was to generate information relative to the allele distribution and dynamics within and among populations of Araucaria angustifolia, a naturally-occurring conifer in the south of Brazil, being known popularly as "pinheiro-do-Paraná", "araucaria" or pine tree. In order to elucidate the levels and the distribution of the genetic variability, the population's genetic structure and the genetic distance among natural populations of this species with different levels of disturbance in different geographical areas were studied in detail. For this, samples of leaf tissue were collected from 328 adult individuals in nine natural populations in Santa Catarina State. To analyze the samples, the allozyme technique was applied in starch gel... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pinheiro; Forest degradation; Genetic diversity; Genetic erosion. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572002000300014 |
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