Data/hora: 29/05/2024 15:52:58

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 10/11/1998
Data da última atualização: | 30/03/2017
Autoria: | PENNOCK, D. J.; KESSEL, C. van.
Título: | Clear-cut forest harvest impacts on soil quality indicators in the mixedwood forest of Saskatchewan, Canada.
Ano de publicação: | 1997
Fonte/Imprenta: | Geoderma, v.75, n.1/2, p.13-32, 1997.
Idioma: | Inglês
Conteúdo: | The concept of soil quality is relevant to a range of human-indiced disturbances on soil; our objective was to examine the impact of clear-cutting on soil quality conditions in six Mixedwood (Populus tremuloides-Picea glauca) stands in Central Saskatchewan, Canada. Soil quality conditions at two short-term (1 to 5 years) and four medium-term (6 to 20 years) clear-cut sites were compared to eight mature Mixedwood sites. All sites had similar, albeit complex, distribution of soil and parent sediments. No major differences were observed between the short-term clear-cut sites and the mature Mixedwood sites. At the medium-term sites, substantial losses of soil organic carbon (24%), soil nitrogen (27%) and LFH thickness (28%) were observed, along with decreases in the soil surface (0 to 15 cm layer) of exchangeable calcium and magnesium (30%), soluble organic P (15%) and cation exchange capacity and base saturation (20%). The losses were much lower in the 15 to 45 cm layer of the soil. Overall, the levels of these soil components observed at the clear-cut sites were within the natural or undisturbed range as assessed at the mature Mixedwood sites; however the amounts of soil organic carbon and nitrogen at the clear-cut sites were lower than the natural range. Althhought the absolute levels of loss of soil organic carbon and nitrogen were much lower than in typical agricultural landscapes, the long-term ecological significance of the losses in these forested landscapes remains a concern.
Palavras-Chave: | Degradacao do solo; Forest; Impact; Impacto; Qualidade do solo.
Thesagro: | Floresta.
Thesaurus Nal: | Canada; soil degradation; soil quality.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (36383-1) - ADD - SP - PP - SP15754 -  - 15754 - DIS