Please have a look at these researchgate links

https://www.researchgate.net/publication/237339477_Wood_Densities_of_Tropical_Tree_Species

https://www.researchgate.net/publication/259739406_Variation_in_wood_density_and_carbon_content_of_tropical_plantation_tree_species_from_Ghana

https://www.researchgate.net/publication/281532511_Mapping_tree_density_at_a_global_scale

Article Wood Densities of Tropical Tree Species

Article Variation in wood density and carbon content of tropical pla...

Article Mapping tree density at a global scale

Please have a look at these links and PDF attachment also.

http://link.springer.com/article/10.1007/s11056-013-9390-8

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2710901/

Dear Arvind, thank you very much for your helpful support. I got the information needed for my calculations.Best regards

Hi Kilian,

Here you can find a Global Wood Density Database in a Excel file:

http://datadryad.org/handle/10255/dryad.235

http://datadryad.org/bitstream/handle/10255/dryad.235/GlobalWoodDensityDatabase.xls 

Regards

Please have check in "Globalwooddensitydatabase"

Dear Kilian Mathan, I suggest that you also take a look on those attached files.

e.g you need around 5 individuals from the same speceis to capture the specie density variation. Best Giga

See Jenkins et al. 2003 in Forest Science. Many tree species densities are listed here for the US and you may find cross-references for Europe as well.

Dear Kilian Mathan,

I suggest you to see paper by Köster et al. 2015 in Forest Ecology and Management.

Köster, K., Metslaid, M., Engelhart, J. and Köster, E. 2015. Dead wood basic density, and the concentration of carbon and nitrogen for main tree species in managed hemiboreal forests. Forest Ecology and Management, 354: 35−42, j.foreco.2015.06.039.

http://www.sciencedirect.com/science/article/pii/S0378112715003655

Best regards,

Marek Metslaid

Thank you all very much for these helpful contributions. I was able to find the densities even of the rare species. Thanks to you