Loading ...I laid down another barrow of corduroy stem segments to get through a wet patch in the conifer plantings of a 6-acre municipal forest where I am volunteer site steward. The sapling in the background, behind the spade, is a western redcedar. I have also planted Sitka spruce in these groundwater discharge areas, with the upland sites left for Douglas-fir, coastal variety of lodgepole pine, and grand fir (balsam). As you said, it’s good to plant a mix of species, with each chosen for the site it likes best, instead of plunking down the same kind of seedlings over the whole target planting area.
This picture will strike you as pretty wimpy corduroy foundation, compared to what you would lay down for your four-wheeler or logging truck, but the principle is the same – find a cheap way to float over the seepage areas and perennial wet patches.
I notice that Maya also uses the same principle of laying down the railway ties perpendicular to the direction of travel ! 
Have a good day. Equiz.