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Are exotic invasions and species loss related to N:P stoichiometry ? A test for Brazilian cerrado vegetation.

Titel Englisch Are exotic invasions and species loss related to N:P stoichiometry ? A test for Brazilian cerrado vegetation.
Gesuchsteller/in Olde Venterink Harry
Nummer 122563
Förderungsinstrument Projektförderung (Abt. I-III)
Forschungseinrichtung Institut für Integrative Biologie Departement Umweltwissenschaften ETHZ
Hochschule ETH Zürich - ETHZ
Hauptdisziplin Oekologie
Beginn/Ende 01.10.2008 - 30.11.2011
Bewilligter Betrag 189'725.00
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Keywords (15)

ecological stoichiometry; nitrogen; phosphorus; savanna; biodiversity; species loss; species competition; cerrado; red list species; exotic invasion; alien plants; environmental change; plant ecology; ecosystem; ecology

Lay Summary (Englisch)

Lead
Lay summary
Laysummary: Worldwide, plant species diversity is threatened, and in many areas native communities are invaded by exotic species. Nutrient enrichment is often mentioned as an important factor for both species loss and exotic invasions. It is not clear, however, whether these processes are principally due to nitrogen (N) enrichment, or whether phosphorus (P) enrichment and/or N:P stoichiometry (i.e. the proportion of the two nutrients) are also important. Species loss and exotic invasions have been studied most intensively in temperate regions of the Northern hemisphere where N is commonly a growth-limiting resource, but many hotspots of biodiversity are located around or south of the equator where P-limitation appears more common. The overall aim of the proposed study is to improve understanding of the influence of both N and P enrichment as well as N:P stoichiometry on species loss and exotic invasions in cerrado plant communities of Brazil.The study has the following specific objectives:1. To evaluate whether the occurrences of endangered and exotic invasive species in the Cerrado are related to the productivity and/or the type of nutrient limitation of the herbaceous vegetation.2. To study effects of N and P fertilization on performances of endangered and exotic invasive plants in herbaceous cerrado vegetations.3. To study the effects of N and P fertilization on plant traits and competitive between native and exotic cerrado grasses.The study area, the RECOR reserve near Brasilia, is well suited for our study for various reasons: (i) it contains many endangered and exotic species according to official lists, (ii) it contains a diversity of plant communities that probably vary widely in N and P availabilities and limitation, and (iii) it offers excellent research facilities and collaborations with local experts and the reserve management. The proposed project will improve our understanding of competition processes between native and exotic plants in relation to N and P enrichment and N:P stoichiometry, and provide valuable information for management and conservation of the Cerrado and its extraordinary species-rich flora.
Direktlink auf Lay Summary Letzte Aktualisierung: 21.02.2013

Verantw. Gesuchsteller/in und weitere Gesuchstellende

Mitarbeitende

Publikationen

Publikation
Does phosphorus limitation promote species-rich plant communities?
Venterink HO (2011), Does phosphorus limitation promote species-rich plant communities?, in PLANT AND SOIL, 345(1-2), 1-9.

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Abstract

Worldwide, plant species diversity is threatened, and in many areas native communities are invaded by exotic species. Nutrient enrichment is often mentioned as an important factor for both species loss and exotic invasions. It is not clear, however, whether these processes are principally due to nitrogen (N) enrichment, or whether phosphorus (P) enrichment and/or N:P stoichiometry are also important. Species loss and exotic invasions have been studied most intensively in temperate regions of the Northern hemisphere where N is commonly a growth-limiting resource, but many hotspots of biodiversity are located around or south of the equator where P-limitation appears more common. The overall aim of the proposed study is to improve understanding of the influence of both N and P enrichment as well as N:P stoichiometry on species loss and exotic invasions in cerrado plant communities of Brazil.The study has the following specific objectives:1.To evaluate whether the occurrences of endangered and exotic invasive species in the Cerrado are related to the productivity of the herbaceous vegetation.2.To evaluate whether the occurrences of endangered and exotic invasive species in herbaceous cerrado vegetation are related to the type of nutrient limitation.3.To study experimentally effects of N, P and N&P fertilization on biomass production and the abundances of endangered and exotic invasive plants in herbaceous cerrado vegetations.4.To study experimentally the effects of different supply levels and ratios of N and P on plant traits and competitive strength of native and exotic cerrado grasses.The study area, the RECOR reserve near Brasilia, is well suited for our study for various reasons: (i) it contains many endangered and exotic species according to official lists, (ii) it contains a diversity of plant communities that probably vary widely in N and P availabilities and limitation, and (iii) it offers excellent research facilities and collaborations with local experts and the reserve management.The project combines three research approaches:1.Field sampling to evaluate whether the occurrence of endangered and exotic invasive plant species is related to productivity and the type of nutrient limitation.2.Field experiments to study effects of N and P fertilization on biomass production and changes in the abundances of endangered and exotic species in various cerrado vegetations.3.A pot experiment to investigate how N:P supply levels and N:P stoichiometry affect plant traits and competition between native and exotic invasive grasses.The proposed project will improve our understanding of competition processes between native and exotic plants in relation to N and P enrichment and N:P stoichiometry, and provide valuable information for management and conservation of the Cerrado and its extraordinary species-rich flora.
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