What we are trying to do is compare the soil texture composition between 3 different kinds of sites. Each site has soil that can be composed of clay, silt, sand, pebble, cobble, and boulders, in different proportions.
Use of principal component analysis will surely reveal such textural variation at different sites...have a look at some of these PDFs below..
Hydrologists use a plot to indicate particle size distribution for channel substrates, displaying what is termed pebble counts. I don't have an example uploaded, but the y axis is the accumulated percent of particles sampled and x axis is particle sizes using log scale grouped for clay, silt, sand, gravel, cobble and boulder, measured in mm typically. The resultant line for each site is the accumulated total, so you could easily plot three sites in one figure. If you are using sieves, their sizes could become your categories, and probably more logical and appropriate for your circumstance to use percent of total weight, rather than particle numbers. You may want to exclude boulders as too difficult to sample and weigh, and they do not classify as soil anyway. If you decide to compare sand, silt and clay only, that can also be done with this approach or use the soil triangle with percent sand, percent silt and percent clay on the three sides of the triangle, so in this instance, you would have 3 points, one for each site.
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