Bill,
Were you able to get anything useful out of the extraction experiment 
samples or reconnaissance data I gave you guys? How is the extraction 
setup working out?
Jon


Bill Showers wrote:
> Hi all! 
> We are soliciting abstract submissions for session B19 on nitrogen isotopes in 
> tree rings to be held at the AGU Fall meeting, San Francisco, December 15-19, 
> 2008.
>
> B19: Using Trees to Better Understand the Impacts of Human Activities on the 
> Nitrogen Cycle 
>
> Human activities have generated emissions of atmospheric nitrogen at an 
> increasing rate over the last 150 years, and the impacts of these emissions on 
> forests are not well constrained. Nitrogen deposition has the potential to 
> acidify terrestrial ecosystems, cause losses of soil nutrients and modify soil 
> fertility. Providing a long term view on how human activities affect the N cycle 
> constitutes an important issue as there is no long-term measurement of 
> atmospheric N emissions. Recent investigations suggest that tree-ring 
> 15Nseries may record regional anthropogenic perturbations of the N cycle. 
> However, the interpretation of nitrogen isotope ratios in tree as environmental 
> indicators is not always clear. This session will gather a group of scientists 
> exploring the possibility of using Nitrogen isotope ratios in trees to: (1) 
> construct and compare long series in various parts of the world, (2) provide a 
> historical perspective on the N cycle; (3) gain a better understanding of the N 
> cycle, and (4) evaluate the anthropogenic impacts on the global N cycle.
>
> Abstract submission, no later than September 10 2008; 
> http://www.agu.org/meetings/fm08/?content=program. 
>
> Looking forward to seeing you in San Francisco 
> Bill Showers & Martine Savard 
>
> Questions or Comments Contact us @: 
> William Showers ([log in to unmask] <mailto:[log in to unmask]>) or 
> Martine M. Savard ([log in to unmask] <mailto:[log in to unmask]>) 
>   


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