Key Finding: Erosion of the topmost soil layers, which are the most important for nutrients, water, and soil biota, is the most damaging to site productivity.
(the topmost soil layers; are; the most important for nutrients, water, and soil biota) (Key Finding; is; the most damaging to site productivity) (the most damaging; to site; productivity)
the topmost soil layers Key Finding the most damaging
are is to site
the most important for nutrients, water, and soil biota
the most damaging to site productivity
productivity