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Influence of soil and organic residue management on biomass and biodiversity of understory vegetation in a Eucalyptus globulus Labill. plantation
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Orientador(es)
Resumo(s)
The objective of this study was to assess the effect of different options of soil preparation and management of harvesting debris on
biodiversity and biomass of understory vegetation in plantations of Eucalyptus globulus of Central Portugal. The experiment
consisted of six treatments in a replanted area and four treatments in a coppice area with five replicates, following a randomised
block design. Surveys of vegetation were performed for 6 years. The proportion of soil cover by plant specieswas estimated and the
Shannon–Wiener diversity and equitability indexes determined for each treatment and year. After the 2nd year, the understory
vegetation was randomly sampled for above-ground biomass determination.Within the planted area, the removal of slash without
soil preparation induced the highest number of species during the experimental period. A similar trend was observed in the coppice
area, but less regularly. Significant differences in the proportion of soil cover only occurred within the planted area in the first year,
when slash removal without soil preparation induced the highest understory cover. Species diversity was not clearly affected by
treatments: significant differences only occurred occasionally and were apparently related to differences in the number of species.
Therefore, differences in the equitability index between treatments never were significant. Removal of slash without soil
disturbance and broadcast of slash over the soil usually shared the highest biodiversity. Differences between treatments in the
amount of understory biomass were never statistically significant during the experimental period. Tendency for a negative influence
of soil mobilisation on the amount of understory biomass was observed within the planted area, as well as a similar effect of the
treatments consisting of broadcast of slash over the soil surface in the coppice area. In parallel to tree development and canopy
closure biomass of that vegetation along the study period was reduced, especially in the planted area.
Descrição
Palavras-chave
eucalyptus globulus biodiversity biomass equitability understory site preparation
Contexto Educativo
Citação
"Forest Ecology and Management". ISSN 0378-1127. 171 (2002) 87-100