Indirect effects of grassland extensification schemes on pollinators in two contrasting European countries
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Published source details
Kohler F., Verhulst J., Knop E., Herzog F. & Kleijn D. (2007) Indirect effects of grassland extensification schemes on pollinators in two contrasting European countries. Biological Conservation, 135, 302-307.
Published source details Kohler F., Verhulst J., Knop E., Herzog F. & Kleijn D. (2007) Indirect effects of grassland extensification schemes on pollinators in two contrasting European countries. Biological Conservation, 135, 302-307.
Actions
This study is summarised as evidence for the following.
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Reduce the intensity of farmland meadow management Action Link |
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Reduce management intensity on permanent grasslands (several interventions at once) Action Link |
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Reduce the intensity of farmland meadow management
In a similar replicated trial in the Netherlands (Kohler et al. 2007), an agri-environment scheme aimed at enhancing habitat for birds by reducing fertiliser and pesticide input and delaying cutting or grazing had no impact on diversity or numbers of non-Apis bees in 21 Dutch wet meadow fields when compared with paired conventionally managed fields. Bee diversity and abundance was low in both field types (average <3 species/field; <6 individuals per field). However, this agri-environment scheme allowed application of nitrogen fertilizer at 206 kg/ha, which is 75% of the standard fertilizer application rate (269 kg/ha). The meadows had been under the scheme for between three and 10 years.
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Reduce management intensity on permanent grasslands (several interventions at once)
A replicated trial in the Netherlands (Kohler et al. 2007) found that an agri-environment scheme aimed at enhancing habitat for birds by reducing fertilizer and pesticide input and delaying cutting or grazing had no impact on diversity of non-Apis spp. bee or plant species in 21 Dutch wet meadow fields when compared with paired conventionally managed fields. Bee diversity and abundance was low in both field types (average <3 species/field; <6 individuals per field). This agri-environment scheme allowed application of nitrogen fertilizer at 206 kg/ha, which is 75% of the standard fertilizer application rate (269 kg/ha). The meadows had been under the scheme for between three and 10 years.
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