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Home NEWS Science News Biology

The importance of light for grassland plant diversity

Bioengineer by Bioengineer
November 3, 2022
in Biology
Reading Time: 2 mins read
0
Experiment
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The team of researchers led by Prof. Dr. Anu Eskelinen from the University of Oulu (Finland) used the Global Change Experimental Facility (GCEF) at the UFZ research station in Bad Lauchstädt for their experiments. Scientists from UFZ, iDiv and various universities use the GCEF platform to study the influence of different climate models and land use intensities on plant community structure – specifically food webs and interactions between species.

Experiment

Credit: Anu Eskelinen / University of Oulu

The team of researchers led by Prof. Dr. Anu Eskelinen from the University of Oulu (Finland) used the Global Change Experimental Facility (GCEF) at the UFZ research station in Bad Lauchstädt for their experiments. Scientists from UFZ, iDiv and various universities use the GCEF platform to study the influence of different climate models and land use intensities on plant community structure – specifically food webs and interactions between species.

Anu Eskelinen, who spent several years at the UFZ and iDiv as a visiting scientist, used a new experimental approach: the team directly illuminated the low-growing plants in the grassland with LED lamps, thus increasing the amount of light. In addition to this treatment, fertilisers were applied on some plots and grazing by sheep was used on others.

The experiment showed a sharp decline in species richness and biodiversity as a result of artificial fertilisation if the areas were not grazed at the same time. When the researchers added LED lamps, the loss of species richness was mitigated. Later, the researchers excluded sheep from half of the plots, which caused species richness and diversity do decline. At the same time, the total vegetation cover increased without grazing, which, in turn, reduced the light available to plants. Importantly, adding light to the understorey plants mitigated this loss of diversity. “These results suggest that herbivory is a dominant factor controlling competition for light and plant diversity,” says first author Anu Eskelinen.

The research team believes that the results from the field trials should be taken into account for future grassland management and conservation policies. “Our results highlight the importance of conserving native herbivores and using sustainable grazing as a management measure,” Anu Eskelinen further emphasises.

Prof. Dr Stan Harpole, co-author and head of the department of Physiological Diversity at UFZ and iDiv, adds: “This study highlights the value of carefully designed manipulative field experiments, which we need so we can strongly test the causes of diversity loss. We could only advance our understanding and test the theory in more realistic conditions because of the excellent infrastructure of the UFZ’s Global Change Experimental Facility and the support provided at the Bad Lauchstädt Research Station, and the cooperation with iDiv.”



Journal

Nature

DOI

10.1038/s41586-022-05383-9

Method of Research

Experimental study

Subject of Research

Not applicable

Article Title

Light competition drives herbivore and nutrient effects on plant diversity.

Article Publication Date

2-Nov-2022

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