life forms spectrum analysis

"Let me paraphrase what you wrote to see if I understand. You have a number
of plots each populated with a variety of plant species"

OK,


"and you are
interested in only two of those species."

No, I'm interested in the whole plot composition! I would like to understand if there are differences in terms of life forms composition beteween two groups of plots (each group has 70 plots). A simple t-test or other non parametric tests do not work fine with count data, as in my case. In addittion some life forms are uncommon so I have a lot of zero count in my data!


You ask if there are meaningful
 in the relative abundances of each of your two species of
interest in the plots.



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