Changes in root NH 4 + and NO 3 − absorption rates of loblolly and ponderosa pine in response to CO2 enrichment

  title={Changes in root NH 4 + and NO 3 − absorption rates of loblolly and ponderosa pine in response to CO2 enrichment},
  author={Hormoz Bassirirad and Kevin L. Griffin and James F. Reynolds and Boyd R. Strain},
  journal={Plant and Soil},
Root growth and physiological uptake capacity for NH 4 + and NO 3 − were examined for seedlings of loblolly and ponderosa pine grown for 160 days under two CO2 levels, ambient (35 Pa) and ambient plus 35 Pa (70 Pa). Fraction of biomass allocated to active fine roots as well as total N (NH 4 + + NO 3 − ) absorption per unit root dry mass were unaffected by CO2. On a whole-plant basis, elevated CO2 led to a significant increase in N acquisition in loblolly but not in ponderosa pine. However, even… CONTINUE READING
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