Contrasting nutrient-capture strategies in shrubs and grasses of a Patagonian arid ecosystem

  title={Contrasting nutrient-capture strategies in shrubs and grasses of a Patagonian arid ecosystem},
  author={Osvaldo E. Sala and Rodolfo A. Golluscio and William K. Lauenroth and P. A. Roset},
Shallow-rooted grasses and deep-rooted shrubs dominate arid ecosystems where nitrogen is concentrated in the upper layers of the soil and water is distributed throughout. Analysis of mineral nitrogen and absorption patterns using a tracer indicated that shrubs in Patagonia absorbed nutrients from the lower, relatively nutrient-poor layers of the soil. Are they, consequently, at a competitive disadvantage with grasses that have the opposite pattern? Studies of nitrogen economy indicated that… CONTINUE READING
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