Hello @umanand 
Thank you for sharing these graphs. With quite a few soil types, and pretty good replicates for each, I think your Master's thesis is off to a good start!
Before we dive in to results, I have a few questions for you.
- Did you run any other alpha diversity metrics? There are quite a few ways to measure this, so it might make sense to pick one that you understand well, or contrast the different results from different metrics. (If you need help choosing one, check out this guide.)
- Do these 8 soil types come from large 'super-groups' like 'arid' vs 'tropical' or 'native' vs 'farmland'? While we can look at each soil individually, it would also be helpful to compare large groups of interest in this study.
- Based on your literature review, what soil types would expect to have the highest alpha diversity values, and which ones would you expect to have the lowest?
(When you group your soils into 'super-group', which groups would expect to be the most and least diverse?)
- All the graphs I can see mention soil type...
Can you edit your post to include the graphs comparing DNA extraction?
(While you are editing, you can remove the bottom section about "Is this post about a User Support Question ?")
Thanks!