Intercropping allows for insect conservation without yield loss

Many field trials with different factors show that if farmers rely on higher crop diversity in mixed cropping, the quantity and diversity of arthropods – such as insects, spiders and crustaceans – increases.
© Taskscape Associates Ltd.

 

How can we halt biodiversity declines? A new study led by the Leibniz Institute for the Analysis of Biodiversity Change (LIB) shows possible solutions for agricultural landscapes. The study shows that intercropping promotes the diversity of insects and other arthropods in agriculture without affecting yields. The study has now been published in the journal Ecological Solutions and Evidence.

Arthropods play a particularly important role in ecosystems. Until now, there has been a lack of strategic experiments on how arthropods develop in diverse crop environments and respond to the use of agrochemicals. Experiments in arable farming have now shown that higher plant biodiversity has a positive effect on the species-rich group of organisms that includes insects, millipedes, crustaceans and arachnids.

In the study, researchers from the LIB, the University of Münster and the University of Bonn investigated how crop diversity and species, as well as the use of agrochemicals – each in different combinations and with different factors – affect arthropod biodiversity. In addition, weeds and crop biomass were measured.

The results show that higher crop diversity in intercropping had a positive effect on arthropod abundance and diversity, irrespective of land use intensity. Mixed crops with faba bean, seed flax or spring rape showed a particularly high arthropod biodiversity. This also shows that mass flowering crops were more attractive to arthropods than legumes or cereals.

“By converting parts of our monocultures to mixed crops, we could increase flower visitation from a few thousand to up to 1.5 million insect visits per hectare and thus probably also indirectly promote ecosystem services such as pollination or biological pest control,” concludes Christoph Scherber, Deputy Director of the LIB. “Intercropping may thus be a promising strategy against the decline of insects in agricultural landscapes. It could also be used to make extensive monocultures more biodiversity friendly and maintain them as a living landscape matrix. By promoting biodiversity across large stretches of land, we could secure the future of biodiversity even in intensive agriculture.”

 

Ecological Solutions and Evidence, Original study: https://besjournals.onlinelibrary.wiley.com/doi/10.1002/2688-8319.12267

 

Contact:

Museum Koenig Bonn
Leibniz Institut for the Analysis of Biodiversity Change (LIB)
Prof. Dr. Christoph Scherber
Vice Director LIB
c.scherber@leibniz-lib.de
+49 (0)228 9122 450
www.leibniz-lib.de

Promoting biodiversity on a broad scale can secure the future of biodiversity even in intensive agriculture. © University of Münster

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