Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Scientists find grass yield, carbon storage not affected by creepy-crawlies in the soil

18.10.2002


New results from experiments at a unique ecology facility show that plant communities are dramatically altered by changes to the type of animal species living among their roots, but that key ecosystem measurements such as overall agricultural yield or the amount of soil carbon stored are unaffected.



According to the results of a three year study into the processes of experimental grassland ecosystems published in the journal Science today, changes to the makeup of soil communities from small to large animal body sizes -ranging from bacteria and fungi to worms and beetles - have no significant effect on the overall yield of the plant life above, nor on the overall amount of carbon stored away in the soil.

The researchers from England, Wales, Scotland, Germany and Finland say that the results of their experiment send an important message about the ability of natural ecosystems to cope with human impacts, such as changes to the composition of soil communities, but caution that further long-term work is needed to confirm their findings.


“The study suggests that if you mess about with soil communities, say from the impacts of global change, you may alter the way the systems work but this has no major consequence in terms of the system’s outputs, for example the amount of grass produced,” says Dr Mark Bradford, lead author of the study based at the Natural Environment Research Council (NERC) Centre for Population Biology, Imperial College London.

“However, further studies may reveal that these changes have an impact over a longer time scale and our current investigations suggest that this could well be the case,” he adds.

The findings are based on work into the effects of global change on soil biodiversity done at the UK’s unique Ecotron research facility at the NERC Centre for Population Biology. The Ecotron consists of 16 sealed walk-in chambers with computer-controlled climatic conditions.

Each chamber housed a mini grassland ecosystem one metre square taken from Sourhope, a grazed upland grassland habitat in Scotland.

Over seven months researchers removed soil animals and then artificially reconstructed the grasslands with animals that differed in their body sizes - treatments contained small, medium or large soil fauna.

The experiment ran for nine months, during which seasonal conditions were set to mimic June/July temperatures in Scotland – akin to a continuous growing season.

The researchers had their expectations, based on previous, simpler experiments, turned on their heads when they came to examine the results.

They had predicted that the larger fauna communities would lead to changes in the composition of the plant community and a rise in the yield, or Net Primary Productivity, because of the previously reported positive effects of these fauna on soil fertility and plant growth. They also expected to see an increase in the amount of carbon stored in the system, or Net Ecosystem Productivity.

In fact they found neither; the different animal soil communities did not change overall vital ecosystems services such as the amount of carbon stored in the soil or the overall yield.

To explain their results, they suggest that both positive and negative effects of the fauna in the soil act to cancel each other out, causing no net ecosystem effects.

The Natural Environment Research Council provides core funding to the Centre for Population Biology as well as funding for this research under its Soil Biodiversity Programme.



Tom Miller | alfa

More articles from Ecology, The Environment and Conservation:

nachricht Preservation of floodplains is flood protection
27.09.2017 | Technische Universität München

nachricht Conservationists are sounding the alarm: parrots much more threatened than assumed
15.09.2017 | Justus-Liebig-Universität Gießen

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Salmonella as a tumour medication

HZI researchers developed a bacterial strain that can be used in cancer therapy

Salmonellae are dangerous pathogens that enter the body via contaminated food and can cause severe infections. But these bacteria are also known to target...

Im Focus: Neutron star merger directly observed for the first time

University of Maryland researchers contribute to historic detection of gravitational waves and light created by event

On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...

Im Focus: Breaking: the first light from two neutron stars merging

Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.

Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....

Im Focus: Smart sensors for efficient processes

Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).

When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...

Im Focus: Cold molecules on collision course

Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.

How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

3rd Symposium on Driving Simulation

23.10.2017 | Event News

ASEAN Member States discuss the future role of renewable energy

17.10.2017 | Event News

World Health Summit 2017: International experts set the course for the future of Global Health

10.10.2017 | Event News

 
Latest News

Microfluidics probe 'cholesterol' of the oil industry

23.10.2017 | Life Sciences

Gamma rays will reach beyond the limits of light

23.10.2017 | Physics and Astronomy

The end of pneumonia? New vaccine offers hope

23.10.2017 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>