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Konferensartikel2004Vetenskapligt granskad

Biomass production following N-fertilization in experimental grassland communities differing in plant species richness and composition

Palmborg, Cecilia; Carlsson, Georg; Huss-Danell, Kerstin

Sammanfattning

In Umeå, Sweden, a manipulated plant biodiversity experiment was established in 1996, as part of the pan-European BIODEPTH project. Twelve species of grasses, legumes and other forbs were combined in experimental communities of 1 to 12 species. The composition of the communities was maintained by weeding during each summer. The vegetation was cut once a year in August. In June 2002 and 2003 one half of each plot was fertilized with 50 kg N ha-1 year-1 as ammonium nitrate. The most important factor for biomass production was the presence of legumes, regardless of fertilization treatment. In plant communities with legumes biomass also increased as the number of plant species increased. N-fertilization increased plant biomass in all plant communities without legumes, and in monocultures of all legumes except Trifolium pratense. The fertilisation-induced increases in biomass were highest in grass communities with Phalaris arundinacea and Dactylis glomerata. Fertilisation-induced increases in plant community biomass were also negatively correlated with the biomass of legumes in the unfertilized parts of the respective plots. Plant communities that produced less biomass with fertilization always included one or more Trifolium species. Possible mechanisms behind these patterns, such as occurrence of plant pathogens and competition between species are discussed

Nyckelord

ammonium nitrate; biodiversty; nitrogen uptake; competition; plant pathogens

Publicerad i

Grassland Science in Europe
2004, Volym: 9, sidor: 183-185 ISBN: 3 7281 2940 2
Utgivare: Organizing committee of the 20th General Meeting of the European Grassland Federation

Konferens

Land Use Systems in Grassland Dominated Regions

      SLU författare

    • Huss-Danell, Kerstin

      • Institutionen för norrländsk jordbruksvetenskap, Sveriges lantbruksuniversitet
      • Palmborg, Cecilia

        • Institutionen för norrländsk jordbruksvetenskap, Sveriges lantbruksuniversitet
        • Carlsson, Georg

          • Institutionen för norrländsk jordbruksvetenskap, Sveriges lantbruksuniversitet

        UKÄ forskningsämne

        Miljö- och naturvårdsvetenskap

        Permanent länk till denna sida (URI)

        https://res.slu.se/id/publ/3696