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Mowing for biodiversity: grass trimmer and knife mower perform equally
Linköping University, Department of Physics, Chemistry and Biology, Biology. Linköping University, The Institute of Technology. (Conservation Ecology Group)
Linköping University, Department of Physics, Chemistry and Biology, Biology. Linköping University, The Institute of Technology. (Conservation Ecology Group)
Linköping University, Department of Physics, Chemistry and Biology, Biology. Linköping University, The Institute of Technology. (Conservation Ecology Group)
Swedish Biodiversity Centre, Swedish University of Agricultural Sciences and Uppsala University, Sweden.
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2014 (English)In: Biodiversity and Conservation, ISSN 0960-3115, E-ISSN 1572-9710, Vol. 23, no 12, 3073-3089 p.Article in journal (Refereed) Published
Abstract [en]

Mowing of semi-natural grasslands is an important management method to maintain the conservation value and species-richness of this habitat. Mowing using cutting instruments, e.g. sickle bar mowers, is thought to be superior by practitioners compared with other mechanical instruments that tears off the plant material, e.g. grass trimmers. However, almost no studies exist that supports this assumption. We analysed a 12-year field trial in a semi-natural grassland in south-eastern Sweden, with the aim of determining which mowing technique best maintains the conservation value of semi-natural grasslands. Two mowing techniques were compared: mowing using a hand-pushed sickle bar mower (a type of knife mower), or mowing using a grass trimmer at a 5-cm or 0-cm cutting height. The odds that a recorded species belongs to a group of indicator species were calculated for sample plots, and odds ratios were calculated contrasting treatments. Three types of indicator species classification systems were used: (i) indicators of management for species richness, (ii) indicators of excess nitrogen and (iii) indicators of lack of management. The odds ratios were calculated for years 1–5, 7 and 12 of the trial. In addition, Principal Response Curve analysis was performed to analyse the change in vegetation composition over time and ANOVA for plant species richness in plots. The results showed that over time there were no differences in the odds of finding indicators of any of the three types, for any of the mowing techniques. Furthermore, there were no apparent change in vegetation composition and only a small effect on richness. These results suggest that mowing using a sickle bar mower or a grass trimmer had the same effect on the floristic composition of grasslands, and both techniques can be recommended for use in semi-natural grasslands.

Place, publisher, year, edition, pages
Springer Publishing Company, 2014. Vol. 23, no 12, 3073-3089 p.
Keyword [en]
Indicators, Management, Meta-analysis, Mowing techniques, Odds ratio, Semi-natural grassland, Sweden
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:liu:diva-111926DOI: 10.1007/s10531-014-0765-8ISI: 000343908600010OAI: oai:DiVA.org:liu-111926DiVA: diva2:762009
Available from: 2014-11-10 Created: 2014-11-10 Last updated: 2017-12-05Bibliographically approved

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Bergman, Karl-OlofPaltto, HeidiWesterberg, LarsMilberg, Per

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