Climate change is not the only threat for our plants

February 15, 2020

To maintain plant and animal species on earth, we need not only to consider the direct effects of climate change, but we must also take other equally important environmental issues into consideration - such as changes in agricultural and forestry practices and indirect effects of climate such as increased frequencies of fires.

"We should absolutely address the climate issue with the utmost seriousness, but, when it comes to biodiversity, there are many other threats that are at least as important to consider", says Johan Ehrlén, professor at the Department of Ecology, Environment and Plant Sciences of Stockholm University.

A recent study published in the scientific journal PNAS has looked at many different types plants; trees, shrubs, herbs and grasses from all over the world. The aim was to explore which environmental factors has the largest effects on the number of plants and how these plants are distributed in the landscape. The scientists looked among other things at effects from climate, pollinators, plant feeders, competition and natural disturbances, such as hurricanes, flooding and fires.

"We found that fires are more important for the survival of plant populations than the direct effect of the climate change. The fact that there are more fires is partly an indirect effect of climate, however. We need to start looking at the indirect effects of climate", says Johan Ehrlén.

Currently, most of the research on plant distributions focuses on the effects of climate. This has two reasons. One is that climate data is readily available in the form of climate maps, which makes it easy to work with - since you don't have to collect a lot of data yourself. The other reason is that society currently is very concerned about the effects of climate.

"Today there are many opinions about what environmental factors are most important to species survival and distribution, but in fact we have very little quantitative information about this. We wanted to go from having mere opinions to finding out how much we actually know", says Johan Ehrlén.

In Sweden, as well as in many other parts of the world, how we use the land is probably more important to biodiversity than climate. One of the major threats in Sweden is the intensification of forestry, leading to more even-aged forests with a single tree species and less old forests, and negative effects on biodiversity. Another large concern are changes in agriculture which have resulted in more homogenous landscapes and smaller areas of habitats that can host many species.

Johan Ehrlén wants to emphasize that the study has only examined small and moderate influences of human land use:

"But if we had included what happens when you remove plants completely, like when you take away an entire forest or build roads, the effect by humans would be even larger", says Johan Ehrlén.
-end-
The study "Biotic and anthropogenic forces rival climatic/abiotic factors in determining global plant population growth and fitness" is published in the official journal of the American National Academy of Sciences, Proceedings of the National Academy of Sciences (PNAS). Link to the study: https://www.pnas.org/content/117/2/1107

Contact


Johan Ehrlén, professor at Department of Ecology, Environment and Plant Sciences and the Bolin Centre for Climate Research at Stockholm University. E-mail: johan.ehrlen@su.se, Phone: +46 8 16 12 02, +46 730 66 08 32.

Stockholm University

Related Climate Change Articles from Brightsurf:

Are climate scientists being too cautious when linking extreme weather to climate change?
Climate science has focused on avoiding false alarms when linking extreme events to climate change.

Mysterious climate change
New research findings underline the crucial role that sea ice throughout the Southern Ocean played for atmospheric CO2 in times of rapid climate change in the past.

Mapping the path of climate change
Predicting a major transition, such as climate change, is extremely difficult, but the probabilistic framework developed by the authors is the first step in identifying the path between a shift in two environmental states.

Small change for climate change: Time to increase research funding to save the world
A new study shows that there is a huge disproportion in the level of funding for social science research into the greatest challenge in combating global warming -- how to get individuals and societies to overcome ingrained human habits to make the changes necessary to mitigate climate change.

Sub-national 'climate clubs' could offer key to combating climate change
'Climate clubs' offering membership for sub-national states, in addition to just countries, could speed up progress towards a globally harmonized climate change policy, which in turn offers a way to achieve stronger climate policies in all countries.

Review of Chinese atmospheric science research over the past 70 years: Climate and climate change
Over the past 70 years since the foundation of the People's Republic of China, Chinese scientists have made great contributions to various fields in the research of atmospheric sciences, which attracted worldwide attention.

A CERN for climate change
In a Perspective article appearing in this week's Proceedings of the National Academy of Sciences, Tim Palmer (Oxford University), and Bjorn Stevens (Max Planck Society), critically reflect on the present state of Earth system modelling.

Fairy-wrens change breeding habits to cope with climate change
Warmer temperatures linked to climate change are having a big impact on the breeding habits of one of Australia's most recognisable bird species, according to researchers at The Australian National University (ANU).

Believing in climate change doesn't mean you are preparing for climate change, study finds
Notre Dame researchers found that although coastal homeowners may perceive a worsening of climate change-related hazards, these attitudes are largely unrelated to a homeowner's expectations of actual home damage.

Older forests resist change -- climate change, that is
Older forests in eastern North America are less vulnerable to climate change than younger forests, particularly for carbon storage, timber production, and biodiversity, new research finds.

Read More: Climate Change News and Climate Change Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.