Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Cleaning the atmosphere of carbon: African forests out of balance

23.02.2009
Tropical forests hold more living biomass than any other terrestrial ecosystem.

A new report in the journal Nature by Lewis et al. shows that not only do trees in intact African tropical forests hold a lot of carbon, they hold more carbon now than they did 40 years ago--a hopeful sign that tropical forests could help to mitigate global warming.

In a companion article, Helene Muller-Landau, staff scientist at the Smithsonian Tropical Research Institute, says that understanding the causes of this African forest carbon sink and projecting its future is anything but straightforward.

Growing trees absorb carbon. Dead, decomposing trees release carbon. Researchers expect growth and death to approximately balance each other out in mature, undisturbed forests, and thus for total tree carbon stocks, the carbon held by the trees, to remain approximately constant. Yet Lewis and colleagues discovered that on average each hectare (100 x 100 meters, or 2.2 acres) of apparently mature, undisturbed African forest was increasing in tree carbon stocks by an amount equal to the weight of a small car each year. Previous studies have shown that Amazonian forests also take up carbon, although at somewhat lower rates.

"If you assume that these forests should be in equilibrium, then the best way to explain why trees are growing bigger is anthropogenic global change – the extra carbon dioxide in the atmosphere could essentially be acting as fertilizer." says Muller-Landau, "But it's also possible that tropical forests are still growing back following past clearing or fire or other disturbance. Given increasing evidence that tropical forests have a long history of human occupation, recovery from past disturbance is almost certainly part of the reason these forests are taking up carbon today."

Muller-Landau, who directs a project to monitor carbon budgets in forest study sites worldwide as part of the Smithsonian's Center for Tropical Forest Science and the HSBC Climate Partnership, advises that this newfound sink shouldn't be taken for granted, or presumed to continue indefinitely. "While we still can't explain exactly what is behind this carbon sink, one thing we know for sure is that it can't be a sink forever. Trees and forests just can't keep getting bigger. Tropical forests are buying us a bit more time right now, but we can't count on them to continue to offset our carbon emissions in the future."

Beth King | EurekAlert!
Further information:
http://www.si.edu
http://www.stri.org

More articles from Ecology, The Environment and Conservation:

nachricht Understanding animal social networks can aid wildlife conservation
23.06.2017 | Leibniz-Institut für Gewässerökologie und Binnenfischerei (IGB)

nachricht Making Oceans Plastic Free - Project tackles the problem of plastic pollution in the oceans
31.05.2017 | Leibniz-Zentrum für Marine Tropenforschung (ZMT)

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: Can we see monkeys from space? Emerging technologies to map biodiversity

An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.

Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...

Im Focus: Climate satellite: Tracking methane with robust laser technology

Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.

Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...

Im Focus: How protons move through a fuel cell

Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.

As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...

Im Focus: A unique data centre for cosmological simulations

Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.

With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...

Im Focus: Scientists develop molecular thermometer for contactless measurement using infrared light

Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine

Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Plants are networkers

19.06.2017 | Event News

Digital Survival Training for Executives

13.06.2017 | Event News

Global Learning Council Summit 2017

13.06.2017 | Event News

 
Latest News

Individualized fiber components for the world market

23.06.2017 | Physics and Astronomy

How brains surrender to sleep

23.06.2017 | Life Sciences

Can we see monkeys from space? Emerging technologies to map biodiversity

23.06.2017 | Information Technology

VideoLinks
B2B-VideoLinks
More VideoLinks >>>