The relationship between diversity and productivity in plant communities: facts and artefacts

Article Abstract:

Numerous explanatory theories have been developed about patterns found in nature. One such pattern is the tendency of the relationship between plant species richness and above-ground biomass to be unimodal when exploring an environment gradient. Since it was first described by Al-Mufti et al. in 1977, the trend has been examined extensively by other researchers using more rigorous calculation tools. These include Rosenzweig and Abramsky (1993) who formulated nine hypotheses regarding the relationship of productivity. Oksanen (1996) developed a 10th hypothesis known as the non-interaction model.

Biodiversity, Species diversity, Biological productivity, Forest productivity

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Serotinous species show correlation between retention time for leaves and cones

Article Abstract:

Data is presented on serotiny, or seed retention in closed cones or fruits for a minimum of one year following ripening. Although serotiny is correlated with leaf longevity, leaf longevity is not necessarily correlated with serotiny.

South Africa, Statistical Data Included, Leaves, Conifers, Cones (Botany)

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Greenhouse studies of interactions between plants: the flaws are in interpretation rather than design

Article Abstract:

An evaluation is presented on studying competition in ecology. An argument is made in favor of stating clear biological objectives prior to selecting research methods.

Competition (Biology), Vegetation dynamics

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