here you can find some articles that could help you:

http://www.sciencedirect.com/science/article/pii/S0924271605000559

http://www.sciencedirect.com/science/article/pii/S0034425708001995

http://www.sciencedirect.com/science/article/pii/S0034425708002770

In these cases if allometric equations are not available or you don't access to the dataset you usually have to use harvest method.

dear victor

The best method of density should each  component tree species taked some sample then optain whit method density common that used the articles.

The volume was measured by the water displacement method. Dry mass, obtained by drying at 85°C ( leaf )and 105°C(wood) for 3 days.

Hi Younes,

Thanks so much for your answer. Actually I try an experiment with samples of Pinus-Patulla, and obtain the density with the method of water displacement and the use of drying methods …. One problem was with the size of the samples and the time to obtain a constant weight. I intend to do the same but in this case only with cores taken with an incremental borer

dear victor

for measurment density core recommendation two article following:

http://link.springer.com/article/10.1007/s002260100106

http://www.tandfonline.com/doi/abs/10.1080/02827581.2014.919350#.VKWXtSuUfQk

Hello again Younes.

Thanks so much for the valuable information. I checked the approaches and the methodology is very interesting. And of course with the necessary resources I think that it is an excellent method to determine density and to perform other studies.