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Providing evidence to improve practice

Individual study: Agri-environment schemes applied to wet grasslands fail to enhance species-richness and abundance of non-Apis bees in the Netherlands

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


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Reduce the intensity of farmland meadow management Bee Conservation

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.

Reduce management intensity on permanent grasslands (several interventions at once) Farmland Conservation

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.