Distribution of Root Biomass in Well-drained Surface Soils

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Abstract
In 9 northern Rocky Mountain vegetation types fine root biomass was zero or small in surface (0-1 cm) layers, was greatest in a subsurface layer somewhere between the depths of 1 and 6 cm, and declined with further increases in depth. Plants of some vegetation types (Bouteloua gracilis, Stipa comata, Agropyron smithii, Hordeum vulgare, Medicago sativa and Pseudotsuga menziesii) may be unable to use light rain showers falling in dry seasons because dry surface (0-1 cm) soils untapped by roots intercept 2-6 mm of water.

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