Navigation Links
Model predicts shifts in carbon absorption by forest canopies
Date:3/31/2010

This release is available in Spanish.

An Agricultural Research Service (ARS) scientist participated in a project to fine-tune computer models that can indicate when forest "carbon sinks" become net carbon generators instead. The results will help pinpoint the effectiveness of trees in offsetting carbon releases that contribute to higher atmospheric temperatures and global climate change.

ARS plant physiologist Erik Hamerlynck teamed up with Rutgers University biologist Karina Schafer and U.S. Forest Service colleagues Kenneth Clark and Nicholas Skowronski to calibrate the Canopy Conductance Constrained Carbon Assimilation (4C-A) model, a computer program that generates carbon balance estimates for tree canopies. Hamerlynck works at the ARS Southwest Watershed Research Center in Tucson, Ariz.

In the summer of 2006, the team measured tree sap flow and leaf-level photosynthetic gas exchange at different canopy levels in a stand of oaks and pines in the New Jersey Pine Barrens. These data were used to calibrate the 4C-A model to simulate the amount of carbon the tree canopy absorbs and releases into the atmosphere via photosynthesis and respiration.

Results from the calibrated modelwhich were within 15 percent of estimates from three other techniquesindicated that the average seasonal carbon absorption of the stand was around 1,240 grams of carbon per square meter of canopy area. The scientists then used the 4C-A model to estimate seasonal carbon exchange rates for 2007, when the same stand of trees was completely defoliated for 2 to 3 weeks during an infestation of gypsy moths. This infestation occurred when the stand was at its seasonal peak for carbon uptake.

The model showed that after the gypsy moths had finished foraging, the average carbon absorption rates for the growing season dropped 25 percent to around 940 grams of carbon per square meter of canopy area. This decline meant that the stand was no longer a net carbon "sink"it ended up adding more carbon back to the atmosphere than it had absorbed.

According to the U.S. Forest Service, U.S. forests absorb and store about 750 million metric tons of carbon dioxide each year. Managing forest resources to optimize carbon sequestration is essential in mitigating the effects of climate change.

Results from this work were published in Global Change Biology.


'/>"/>

Contact: Ann Perry
Ann.Perry@ars.usda.gov
301-504-1628
United States Department of Agriculture-Research, Education, and Economics
Source:Eurekalert

Related biology news :

1. Novel 3-D cell culture model shows selective tumor uptake of nanoparticles
2. A new kind of rat model
3. JILA finds flaw in model describing DNA elasticity
4. Smithsonian researchers develop models to assess wetland health
5. Prediction of RNA pseudoknots using heuristic modeling with mapping and sequential folding
6. Simulating kernel production influences maize model accuracy
7. MIT model could improve some drugs effectiveness
8. Model for the assembly of advanced, single-molecule-based electronic components developed at Pitt
9. Improving detection of nuclear smuggling goal of computer model of mechanical engineer
10. New chimeric mouse model for human liver diseases, drug testing
11. Study finds first-ever genetic animal model of autism
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/15/2016)... 2016 Research and Markets has ... Market 2016-2020,"  report to their offering.  , ... ,The global gait biometrics market is expected to ... period 2016-2020. Gait analysis generates multiple ... used to compute factors that are not or ...
(Date:3/31/2016)... , March 31, 2016  Genomics firm Nabsys has ... CEO, Barrett Bready , M.D., who returned to ... the original technical leadership team, including Chief Technology Officer, ... Product Development, Steve Nurnberg and Vice President of Software ... the company. Dr. Bready served as CEO ...
(Date:3/22/2016)... and SANDY, Utah , ... which operates the highest sample volume laboratory in ... Genomics and UNIConnect, leaders in clinical sequencing informatics and ... launch of a project to establish the informatics infrastructure ... NSO has been contracted by the Ontario ...
Breaking Biology News(10 mins):
(Date:5/26/2016)... Diego, CA (PRWEB) , ... May 26, 2016 ... ... development and manufacturing company, today announced several positive developments that position the Company ... As a result of the transaction, Craig F. Kinghorn has been appointed Chairman ...
(Date:5/25/2016)... ... May 25, 2016 , ... ... became double board-certified in surgery and surgery of the hand by the National ... no stranger to going above and beyond in his pursuit of providing the ...
(Date:5/25/2016)... ... 25, 2016 , ... Biohaven Pharmaceutical Holding Company Ltd. (Biohaven) ... company’s orphan drug designation request covering BHV-4157 for the treatment of Spinocerebellar Ataxia ... , Spinocerebellar ataxia is a rare, debilitating neurodegenerative disorder that is estimated ...
(Date:5/23/2016)... ... May 23, 2016 , ... The need for blood donations in South Texas and across ... South Texas Blood & Tissue Center, blood donations are on the decline. In fact, donations ... are down 21 percent in South Texas in the last four years alone. , There ...
Breaking Biology Technology: