Differential responses of root uptake kinetics of NH + 4 and NO - 3 to enriched atmospheric CO 2 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 CO 2 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 CO 2 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.

Full Text

Duke Authors

Cited Authors

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

Published Date

  • January 1, 1996

Published In

Volume / Issue

  • 19 / 3

Start / End Page

  • 367 - 371

International Standard Serial Number (ISSN)

  • 0140-7791

Digital Object Identifier (DOI)

  • 10.1111/j.1365-3040.1996.tb00260.x

Citation Source

  • Scopus