timberline decreases in altitude, as do the various accompanying vegetational zones. There is also a major change in species in some of the higher zones due to a wind corridor through the Cascades.
Mountain soil occurring above the timberline.
amendment (soil)
(1) An alteration of the properties of a soil and thereby of the soil by the addition of substances such as lime, ...
alpine The region that is above the montane timberline, characterized by the presence of herbs and grass-like plants and low, slow-growing shrubs.
 See also: Acid, Alluvial, Condition, Characteristic, Well
  
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