Dear Marchi,

Landsat images, MODIS will be useful for the time series.

I will suggest some of the articles that will be useful, see the links below:

https://www.sciencedirect.com/science/article/pii/S0034425709003745

https://www.sciencedirect.com/science/article/pii/S0034425710002865

https://www.sciencedirect.com/science/article/pii/S003442570900087X

http://iopscience.iop.org/article/10.1088/1748-9326/7/3/034010/meta

Wishes

You may be interested in contacting the US Forest Service, concerning site index studies available, as well as ongoing FIA plots that established long term plots, and continue to remeasure trees about each decade on growth and stand composition for nationwide plots to help assess forest statistics as those mentioned. A number of timber companies have also conducted site index studies, but their data may not be publically available, but some exceptions that researchers have contributed to literature. How available raw data may be publicable is not known, but there may be some opportunity to collaborate with other scientists on the ideas.

Dear Maurizio,

I know that some of my collegues from the Pontificial catholic university of Ecuador are taking this kind of data each five year in a tropical rainforest dynamic plot of 50 ha in Ecuador. The head of the project is Renato Valencia, you can may be contact him to see if and how you can use these data.

kind regards,

Brian

REDD++ repository is growing for global spatial data sets on forest inventories.