A carregar...
Publicação
Growth dynamics and productivity of pure and mixed Castanea sativa Mill. and Pseudotsuga manziesii (Mirb.) Franco plantations in northern Portugal
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 793.22 KB | Adobe PDF |
Orientador(es)
Resumo(s)
Since the late 1980’s the productivity of monocultures vs. mixed-species
forests has been the subject of studies by forest managers and ecologists.
Mixed plantations have been established in different proportions to determine
if mixtures could provide greater yields and more benefits than monocultures
of the component species, as well as to understand if they could be an interesting
economic option. An experimental design trial was set up in the north
of Portugal in a replacement series with pure and mixed Castanea sativa Mill.
and Pseudotsuga menziesii (Mirb.) Franco. The objective of this study was to
assess growth dynamics and compare the aboveground biomass and net
primary production of the two species in pure and mixed treatments in proportions
1:1 and 1:3. The growth was measured at 7, 11, 15, 17, 19, 27 and 28
years after planting and aboveground net primary production was estimated at
age 28. As a component of the mixed treatments, P. menziesii exhibited greater
height, diameter and aboveground biomass than C. sativa. Relative yield
total indicated a higher productivity in the mixtures compared with the pure
treatments. Early in the development, pure treatments and mixtures had similar
aboveground biomass per hectare, but later the mixtures showed higher
yield than pure treatments. The mixture productivity increase through time
appears to be the result of both canopy stratification and better use of site resources.
The aboveground net primary production was also higher in mixed
than in the pure treatments
Descrição
Research Article
Palavras-chave
growth productivity biomass mixed-species interactions replacement series
Contexto Educativo
Citação
Nunes L, Gower ST, Monteiro ML, Lopes D, Rego FC, 2014. Growth dynamics and productivity of pure and mixed Castanea sativa Mill. and Pseudotsuga menziesii (Mirb.) Franco plantations in northern Portugal. iForest 7: 92-102
Editora
SISEF