DOES THE CUTTING OF MIOMBO TREE SPECIES FOR CHARCOAL PRODUCTION DIRECTLY CAUSE DEFORESTATION? A CASE STUDY OF KAPIRI MPOSHI AREA, CENTRAL ZAMBIA

2018 ◽  
Vol 7 (1) ◽  
pp. 45-65
Keyword(s):  
Tree Species ◽  
Charcoal Production

scholarly journals O problema das espécies arbóreas exóticas comercializadas nos viveiros florestais: Estudo de caso no município de Juiz de Fora (MG) - The problem of exotic tree species marketed in forest nurseries: a case study in the municipality of Juiz de Fora (MG)

2015 ◽  
Vol 11 (1) ◽  
pp. 28 ◽  
Author(s):  
Norberto Emídio de Oliveira Neto ◽  
Cassiano Ribeiro da Fonseca ◽  
Fabrício Alvim Carvalho
Keyword(s):  
Tree Species ◽  
Persea Americana ◽  
Mata Atlântica ◽  
Syzygium Jambos ◽  
Morus Nigra ◽  
Exotic Tree ◽  
Mata Atlantica ◽  
Forest Nurseries

O comércio de mudas florestais para a recuperação de áreas degradadas e reflorestamento é crescente e demanda cada vez mais conhecimentos sobre práticas de manejo na produção de essências nativas, adequadas aos padrões ecológicos locais e à legislação ambiental vigente. Entretanto, a comercialização de mudas exóticas ainda é prática comum nos viveiros florestais, não existindo, para a microrregião de Juiz de Fora, MG, informações sobre os tipos de mudas comercializados nos viveiros florestais. Neste estudo foram levantadas as espécies florestais comercializadas em oito viveiros florestais no município de Juiz de Fora, MG, e que abastecem os projetos de reflorestamento na região. As espécies foram identificadas e categorizadas em nativas da Mata Atlântica ou exóticas. Foram encontradas ao todo 147 espécies. Destas, 64 (43,5% do total) foram exóticas, sendo encontradas, com grande frequência (>50%) entre os viveiros, englobando espécies frutíferas com perfil tipicamente comercial, como Psidium guaja), abacate (Persea americana), amora (Morus nigra) e cítricas – laranja, limão e tangerina (Citrus sp.). Também foram registradas algumas espécies consideradas de alto potencial invasor nas florestas Neotropicais, como o Jambo-rosa (Syzygium jambos), comercializada em metade dos viveiros analisados. A presente análise evidencia uma grande produção e comercialização de espécies exóticas de mudas florestais, utilizadas nos projetos de reflorestamento do município, o que não condiz com a legislação florestal vigente e ainda pode ser considerado como grande risco em potencial para invasão biológica.

scholarly journals Evolutionary history predicts the response of tree species to forest loss: A case study in peninsular Spain

PLoS ONE ◽  
2018 ◽  
Vol 13 (9) ◽  
pp. e0204365 ◽  
Author(s):  
Rafael Molina-Venegas ◽  
Sonia Llorente-Culebras ◽  
Paloma Ruiz-Benito ◽  
Miguel A. Rodríguez
Keyword(s):  
Tree Species ◽  
Evolutionary History ◽  
Forest Loss ◽  
Peninsular Spain

Diversity and Regeneration of Tree Species in Western Himalayas: A Case Study from Kedarnath Wildlife Sanctuary

2021 ◽  
pp. 279-321
Author(s):  
Zubair A. Malik ◽  
Jahangeer A. Bhat ◽  
Mudasir Youssouf ◽  
A. B. Bhatt
Keyword(s):  
Tree Species ◽  
Western Himalayas ◽  
Wildlife Sanctuary ◽  
Kedarnath Wildlife Sanctuary

Modelling seed germination in forest tree species through survival analysis. The Pinus pinea L. case study

2013 ◽  
Vol 289 ◽  
pp. 515-524 ◽  
Author(s):  
Rubén Manso ◽  
Mathieu Fortin ◽  
Rafael Calama ◽  
Marta Pardos
Keyword(s):  
Survival Analysis ◽  
Seed Germination ◽  
Tree Species ◽  
Forest Tree ◽  
Pinus Pinea ◽  
Forest Tree Species

scholarly journals Harvester Productivity in Inclined Terrain with Extended Machine Operating Trail Intervals: A German Case Study Comparison of Standing and Bunched Trees

2020 ◽  
Vol 12 (21) ◽  
pp. 9168
Author(s):  
Ferréol Berendt ◽  
Eduardo Tolosana ◽  
Stephan Hoffmann ◽  
Paula Alonso ◽  
Janine Schweier
Keyword(s):  
Tree Species ◽  
Timber Harvesting ◽  
Forest Stands ◽  
Operational Conditions ◽  
Thinning Operation ◽  
Standing Trees ◽  
Broadleaved Tree Species ◽  
Broadleaved Tree ◽  
Multiple Tree

The complexity of highly structured forests with multiple tree species, especially when coniferous and broadleaved tree species are mixed, as well as stands with extended machine operating trail spacing and inclined terrain, create challenging operational conditions for mechanized timber harvesting and extraction. Motor-manually felling trees within the midfield and bunching them at the machine operating trails, prior to the arrival of a harvester-forwarder system, is a complex operation. The aim of this study was to assess and compare tethered harvester productivities of a thinning operation, for felling and processing standing trees and for processing bunched trees, through a time study in forest stands with 40-m distances between machine operating trails. Total operational costs of the analyzed thinning operation were 69 €/m3o.b., including extraction using a multiple forwarder approach. Tree species, merchantable timber volume, and whether the trees were standing or presented as bunched logs all had a significant effect on the harvester time consumption. Moreover, harvester positioning time was significantly shorter when trees were already bunched at the machine operating trail. While the productivity of standing or bunched spruce trees did not differ significantly between the cases (approximately 18 m3o.b./productive machine hours excluding all delays (PMH0)), the productivity of standing broadleaved tree species (8.3 m3o.b./PMH0) was much lower than that of bunched trees (15.5 m3o.b./PMH0). Thus, the described timber harvesting and extraction system may be a valuable option for forest stands with high proportion of broadleaved trees.

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