New research suggests that high human atmospheric nitrogen emissions lead to a reduction of plant diversity.

Researchers at the University of Basel analyzed plots all over Switzerland and found that the plant diversity has decreased in landscapes with high nitrogen deposition.

Nitrogen is an essential plant nutrient that used to be available only in limited amounts. Many ecosystems rich in plant species are adapted to low nitrogen availability. An increase in nitrogen availability often favors a few highly competitive species, resulting in a decrease of the overall plant diversity.

For the study, researchers compared six different measures of plant diversity on 381 randomly selected study plots in Switzerland. The plots were each one square kilometer in size and located between 260 and 3200 meters elevation. In all six measures, the researchers found a negative relation to atmospheric nitrogen emissions.

"Negative effects of nitrogen deposition on plant diversity were so far known from small-scale studies conducted mostly in areas of high conservation value", Tobias Roth, first author of the study, said on a statement. "We wanted to know whether these effects are also evident when looking at entire landscapes and different elevations".

The weakest relation was found in the traditionally measured species richness, which measures the number of plant species per plot. The biologists found the strongest effect in the so-called phylogenetic diversity, a measure that compares DNA sequences. High nitrogen deposition thus leads to plant species being more strongly related to each other.

The study estimates the loss in phylogenetic plant diversity due to current human-induced nitrogen deposition at 19 percent.

As a reference value, the researchers used an estimated historic nitrogen deposition without human influence. Compared to the historic reference value, the loss in traditionally measured plant species richness was 5 percent. The researchers also compared the data to nitrogen deposition measures from 1880, during the industrialization in Europe. The loss in phylogenetic plant diversity in this case was still 11 percent.

The findings are detailed in the journal Vaccine.