Meny

Du är här

Long-term effectiveness of sowing high and low diversity seed mixtures to enhance plant community development on ex-arable fields

Författare:
Publiceringsår: 2007
Språk: Engelska
Sidor: 97-110
Publikation/Tidskrift/Serie: Applied Vegetation Science
Volym: 10
Nummer: 1
Dokumenttyp: Artikel
Förlag: OPULUS PRESS UPPSALA AB

Sammanfattning

Questions: How is succession on ex-arable land affected by sowing high and low diversity mixtures of grassland species as compared to natural succession? How long do effects persist?
Location: Experimental plots installed in the Czech Republic, The Netherlands, Spain, Sweden and the United Kingdom.

Methods: The experiment was established on ex-arable land, with five blocks, each containing three 10 m x 10 m experiment tal plots: natural colonization, a low- (four species) and high-diversity (15 species) seed mixture. Species composition and biomass was followed for eight years.

Results: The sown plants considerably affected the whole successional pathway and the effects persisted during the whole eight year period. Whilst the proportion of sown species (characterized by their cover) increased during the study period, the number of sown species started to decrease from the third season onwards. Sowing caused suppression of natural colonizing species, and the sown plots had more biomass. These effects were on average larger in the high diversity mixtures. However, the low diversity replicate sown with the mixture that produced the largest biomass or largest suppression of natural colonizers fell within the range recorded at the five replicates of the high diversity plots. The natural colonization plots usually had the highest total species richness and lowest productivity at the end of the observation period.

Conclusions: The effect of sowing demonstrated dispersal limitation as a factor controlling the rate of early secondary succession. Diversity was important primarily for its 'insurance effect': the high diversity mixtures were always able to compensate for the failure of some species.

Disputation

Nyckelord

  • Earth and Environmental Sciences

Övriga

Published
Yes
  • Soil Ecology
  • ISSN: 1402-2001

Box 117, 221 00 LUND
Telefon 046-222 00 00 (växel)
Telefax 046-222 47 20
lu [at] lu [dot] se

Fakturaadress: Box 188, 221 00 LUND
Organisationsnummer: 202100-3211
Om webbplatsen