Oecologia

, Volume 159, Issue 3, pp 493–503 | Cite as

Spatial variation of the stable nitrogen isotope ratio of woody plants along a topoedaphic gradient in a subtropical savanna

  • Edith Bai
  • Thomas W. Boutton
  • Feng Liu
  • X. Ben Wu
  • Steven R. Archer
  • C. Thomas Hallmark
Physiological Ecology - Original Paper

Abstract

Variation in the stable N isotope ratio (δ15N) of plants and soils often reflects the influence of environment on the N cycle. We measured leaf δ15N and N concentration ([N]) on all individuals of Prosopis glandulosa (deciduous tree legume), Condalia hookeri (evergreen shrub), and Zanthoxylum fagara (evergreen shrub) present within a belt transect 308 m long × 12 m wide in a subtropical savanna ecosystem in southern Texas, USA in April and August 2005. Soil texture, gravimetric water content (GWC), total N and δ15N were also measured along the transect. At the landscape scale, leaf δ15N was negatively related to elevation for all the three species along this topoedaphic sequence. Changes in soil δ15N, total N, and GWC appeared to contribute to this spatial pattern of leaf δ15N. In lower portions of the landscape, greater soil N availability and GWC are associated with relatively high rates of both N mineralization and nitrification. Both soil δ15N and leaf [N] were positively correlated with leaf δ15N of non-N2 fixing plants. Leaf δ15N of P. glandulosa, an N2-fixing legume, did not correlate with leaf [N]; the δ15N of P. glandulosa’s leaves were closer to atmospheric N2 and significantly lower than those of C. hookeri and Z. fagara. Additionally, at smaller spatial scales, a proximity index (which reflected the density and distance of surrounding P. glandulosa trees) was negatively correlated with leaf δ15N of C. hookeri and Z. fagara, indicating the N2-fixing P. glandulosa may be important to the N nutrition of nearby non-N2-fixing species. Our results indicate plant 15N natural abundance can reflect the extent of N retention and help us better understand N dynamics and plant-soil interactions at ecosystem and landscape scales.

Keywords

Nitrogen isotope discrimination Nitrogen cycling Dinitrogen fixation Spatial scale Nitrogen availability 

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Edith Bai
    • 1
    • 4
  • Thomas W. Boutton
    • 1
  • Feng Liu
    • 1
    • 5
  • X. Ben Wu
    • 1
  • Steven R. Archer
    • 2
  • C. Thomas Hallmark
    • 3
  1. 1.Department of Ecosystem Science and ManagementTexas A&M UniversityCollege StationUSA
  2. 2.School of Natural ResourcesUniversity of ArizonaTucsonUSA
  3. 3.Department of Soil and Crop SciencesTexas A&M UniversityCollege StationUSA
  4. 4.Department of Land, Air, and Water ResourcesUniversity of CaliforniaDavisUSA
  5. 5.Forest Landscape Ecology Lab, Department of Forest and Wildlife EcologyUniversity of WisconsinMadisonUSA

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