What is the question can you please elaborate more.

This is not an answer but a question: How deep is "deep-root". Without knowing this it is hard to give an answer.

Dear Golman,

Thanks for your contribution,

Very good you have roots of 250 species from mangrove plants.

Do you have the information about position collection on the soil profile ?

regards

Jean-luc

Dear Klaus,

For your good question "How deep is deep-root" We propose some definition of deep root on recent papers " How to study deep roots—and why it matters"

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3741475/.

regards

Jean-luc