Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:


Recommend this page:
To (Recipient's email address)
Your name (Optional)
From (Your email address)
Message (Optional)
Datenschutz-Hinweis: Die Mailadressen werden von uns weder gespeichert noch an Dritte weitergegeben. Sie werden ausschließlich zu Übertragungszwecken verwendet.

Decomposing logs show local factors undervalued in climate change predictions


A new Yale-led study challenges the long-held assumption that climate is the primary driver of how quickly organic matter decomposes in different regions, a key piece of information used in formulating climate models.

In a long-term analysis conducted across several sites in the eastern United States, a team of researchers found that local factors — from levels of fungal colonization to the specific physical locations of the wood — play a far greater role than climate in wood decomposition rates and the subsequent impacts on regional carbon cycling.

Researchers distributed 160 blocks of pine tree wood across five sub-regions of temperate forest in the eastern United States to determine the affect of local factors on carbon cycling.

Because decomposition of organic matter strongly influences the storage of carbon, or its release into the atmosphere, it is a major factor in potential changes to the climate.

The findings underscore a key limitation of using aggregated data across wide geographic areas to predict future climate change, said Mark A. Bradford, an assistant professor of terrestrial ecosystem ecology at the Yale School of Forestry & Environmental Studies (F&ES) and lead author of the study published in the journal Nature Climate Change.

They also suggest that better identifying and measuring such hyper-local ecological factors could significantly improve the effectiveness of climate change projections, he adds.

“We’re reaching the wrong conclusion about the major controls on decomposition because of the way we’ve traditionally collected and looked at our data,” Bradford said. “That in turn will weaken the effectiveness of climate prediction.”

It has long been thought that climate is the predominant factor controlling decomposition, mainly because warmer temperatures increase the activity levels of the “decomposer” organisms, such as microbes, that break down dead organic matter.

While scientific studies have revealed the critical importance of climate and temperature in determining decomposition rates across regional and global scales, the findings are often based on the mean response of decomposition across large areas.

According to Bradford, the use of mean responses can mask the local-scale information, such as the abundance of soil fungi and animals, which may be more important in governing the release of terrestrial carbon.

To better assess the importance of those local effects, the researchers distributed 160 blocks of pine tree wood across five sub-regions of temperate forest in the eastern United States — from Connecticut to northern Florida — and then monitored the decay that occurred over 13 months.

They selected similar forest types in order to focus on major differences in the effect of climate across the regional gradient. (The average annual temperature in southern New England is about 11 degrees Celsius cooler than Florida.) But within each of the five sub-regions they placed the wood blocks in different types of terrain to evaluate the effects of local versus regional factors on decomposition and capture the variability found in forest environments.

“Most people would try to make sure everything was as standard as possible,” Bradford said. “We said, ‘Well, let’s generate as much variation as possible.’ So we put some blocks on south-facing slopes, where they would be warmer in the summer, and others on north-facing slopes where it’s colder. We put some on top of ridges and others next to streams where it was wetter.”

After 13 months, they measured how much carbon had been lost, whether absorbed by the microbes growing on the wood or directly into the atmosphere as carbon dioxide.

According to their analysis, local-scale factors explained about three-quarters of the variation in wood decomposition, while climate explained only about one-quarter, contrary to the expectation that climate should be the predominant control.

Since those local factors likely are the primary drivers of decomposition rates, Bradford said, they should be better documented and integrated into climate models.

“The [climate] modelers know that they can only produce models based on the data sets that we give them,” he said. “So the message for field ecologists like me is to go out and get much richer data sets with much more information. We shouldn’t aggregate away information. We should make measurements at those local scales to capture all of the importance processes that affect ecosystem functioning.

“Then the modelers will have far richer data sets to test their models against and see if they work,” he adds.

The study was a collaboration among researchers from Yale; State University of New York-Buffalo; the Institute of Microbiology, Academy of Sciences of the Czech Republic; the U.S. National Center for Atmospheric Research; Columbia University; and the University of Central Florida.

Co-authors of the study, “Climate fails to predict wood decomposition at regional scales,” include Thomas W. Crowther, Daniel S. Maynard, and Emily E. Oldfield of the Yale School of Forestry & Environmental Studies.

The research was funded by the National Science Foundation’s Division of Environmental Biology and the Yale Climate & Energy Institute.

To read the complete article, visit:

Kevin Dennehy | Eurek Alert!
Further information:

Further reports about: Environmental Forestry blocks decomposition ecosystem effects microbes terrestrial

More articles from Earth Sciences:

nachricht Rapid plankton growth in ocean seen as sign of carbon dioxide loading
27.11.2015 | Johns Hopkins University

nachricht Revealing glacier flow with animated satellite images
26.11.2015 | European Geosciences Union

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Climate study finds evidence of global shift in the 1980s

Planet Earth experienced a global climate shift in the late 1980s on an unprecedented scale, fuelled by anthropogenic warming and a volcanic eruption, according to new research published this week.

Scientists say that a major step change, or ‘regime shift’, in the Earth’s biophysical systems, from the upper atmosphere to the depths of the ocean and from...

Im Focus: Innovative Photovoltaics – from the Lab to the Façade

Fraunhofer ISE Demonstrates New Cell and Module Technologies on its Outer Building Façade

The Fraunhofer Institute for Solar Energy Systems ISE has installed 70 photovoltaic modules on the outer façade of one of its lab buildings. The modules were...

Im Focus: Lactate for Brain Energy

Nerve cells cover their high energy demand with glucose and lactate. Scientists of the University of Zurich now provide new support for this. They show for the first time in the intact mouse brain evidence for an exchange of lactate between different brain cells. With this study they were able to confirm a 20-year old hypothesis.

In comparison to other organs, the human brain has the highest energy requirements. The supply of energy for nerve cells and the particular role of lactic acid...

Im Focus: Laser process simulation available as app for first time

In laser material processing, the simulation of processes has made great strides over the past few years. Today, the software can predict relatively well what will happen on the workpiece. Unfortunately, it is also highly complex and requires a lot of computing time. Thanks to clever simplification, experts from Fraunhofer ILT are now able to offer the first-ever simulation software that calculates processes in real time and also runs on tablet computers and smartphones. The fast software enables users to do without expensive experiments and to find optimum process parameters even more effectively.

Before now, the reliable simulation of laser processes was a job for experts. Armed with sophisticated software packages and after many hours on computer...

Im Focus: Quantum Simulation: A Better Understanding of Magnetism

Heidelberg physicists use ultracold atoms to imitate the behaviour of electrons in a solid

Researchers at Heidelberg University have devised a new way to study the phenomenon of magnetism. Using ultracold atoms at near absolute zero, they prepared a...

All Focus news of the innovation-report >>>



Event News

Fraunhofer’s Urban Futures Conference: 2 days in the city of the future

25.11.2015 | Event News

Gluten oder nicht Gluten? Überempfindlichkeit auf Weizen kann unterschiedliche Ursachen haben

17.11.2015 | Event News

Art Collection Deutsche Börse zeigt Ausstellung „Traces of Disorder“

21.10.2015 | Event News

Latest News

Siemens to supply 126 megawatts to onshore wind power plants in Scotland

27.11.2015 | Press release

Two decades of training students and experts in tracking infectious disease

27.11.2015 | Life Sciences

Coming to a monitor near you: A defect-free, molecule-thick film

27.11.2015 | Materials Sciences

More VideoLinks >>>