WilseyPotvin2000

Référence

Wilsey, B.J., Potvin, C. (2000) Biodiversity and ecosystem functioning: Importance of species evenness in an old field. Ecology, 81(4):887-892.

Résumé

Changes in land use, habitat fragmentation, nutrient enrichment, and environmental stress often lead to reduced plant diversity in ecosystems. However, it remains controversial whether these reductions in diversity will affect energy flow and nutrient cycling. Diversity has two components: species richness, or the number of plant species in a given area, and species evenness, or how well distributed abundance or biomass is among species within a community. We experimentally varied species evenness and the identity of the dominant plant species in an old field of Quebec to test whether plant productivity would increase with increasing levels of evenness, and whether relationships would be invariant with respect to species identity. Total and belowground biomass increased linearly with increasing levels of evenness after one growing season. These relationships did not depend on the identity of the dominant species. Relationships between aboveground biomass and evenness varied and depended on the identity of the dominant. Our results are largely consistent with the idea that human-influenced reductions in small-scale plant diversity, in this case evenness, will lead to indirect reductions in total primary productivity. Furthermore, because the evenness treatments were not confounded with species identity, our results suggest that diversity has an effect on plant productivity above and beyond the sampling effect (having a higher probability of species with higher growth rates in diverse communities) seen in studies that vary species richness.

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@ARTICLE { WilseyPotvin2000,
    AUTHOR = { Wilsey, B.J. and Potvin, C. },
    TITLE = { Biodiversity and ecosystem functioning: Importance of species evenness in an old field },
    JOURNAL = { Ecology },
    YEAR = { 2000 },
    VOLUME = { 81 },
    PAGES = { 887-892 },
    NUMBER = { 4 },
    NOTE = { 00129658 (ISSN) Cited By (since 1996): 76 Export Date: 26 April 2007 Source: Scopus CODEN: ECOLA Language of Original Document: English Correspondence Address: Wilsey, B.J.; Dept. of Biological and Earth Sci.; Texas A and M University Commerce, TX 75429, United States References: Aarssen, L.W., High productivity in grassland ecosystems: Affected by species diversity or productive species? (1997) Oikos, 80, pp. 183-184; Bazzaz, F.A., (1996) Plants in Changing Environments: Linking Physiological, Population, and Community Ecology, , Cambridge University Press, Cambridge, UK; Carson, W.P., Barrett, G.W., Succession in oldfield plant communities: Effects of contrasting types of nutrient enrichment (1988) Ecology, 69, pp. 984-994; Chapin F.S. 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    ABSTRACT = { Changes in land use, habitat fragmentation, nutrient enrichment, and environmental stress often lead to reduced plant diversity in ecosystems. However, it remains controversial whether these reductions in diversity will affect energy flow and nutrient cycling. Diversity has two components: species richness, or the number of plant species in a given area, and species evenness, or how well distributed abundance or biomass is among species within a community. We experimentally varied species evenness and the identity of the dominant plant species in an old field of Quebec to test whether plant productivity would increase with increasing levels of evenness, and whether relationships would be invariant with respect to species identity. Total and belowground biomass increased linearly with increasing levels of evenness after one growing season. These relationships did not depend on the identity of the dominant species. Relationships between aboveground biomass and evenness varied and depended on the identity of the dominant. Our results are largely consistent with the idea that human-influenced reductions in small-scale plant diversity, in this case evenness, will lead to indirect reductions in total primary productivity. Furthermore, because the evenness treatments were not confounded with species identity, our results suggest that diversity has an effect on plant productivity above and beyond the sampling effect (having a higher probability of species with higher growth rates in diverse communities) seen in studies that vary species richness. },
    KEYWORDS = { Biodiversity and ecosystem functioning Biomass and plant species evenness Old fields Plant community composition Productivity vs. plant diversity Quebec Species evenness biodiversity ecosystem function old field plant community primary production species evenness },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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