Differential responses of root uptake kinetics of NH+ 4 and NO- 3 to enriched atmospheric CO2 concentration in field-grown loblolly pine

Journal Article

The nitrogen requirement of plants is predominantly supplied by NH+4 and/or NO-3 from the soil solution, but the energetic cost of uptake and assimilation is generally higher for NO-3 than for NH+4. We found that CO2 enrichment of the atmosphere enhanced the root uptake capacity for NO-3, but not for NH+4, in field-grown loblolly pine saplings. Increased preference for NO-3 at the elevated CO2 concentration was accompanied by increased carbohydrate levels in roots. The results have important implications for the potential consequences of global climate change on plant-and ecosystem-level processes in many temperate forest ecosystems.

Duke Authors

Cited Authors

  • Bassirirad, H; Thomas, RB; Reynolds, JF; Strain, BR

Published Date

  • 1996

Published In

  • Plant, Cell and Environment

Volume / Issue

  • 19 / 3

Start / End Page

  • 367 - 371