Variation in below-ground carbon fluxes along a Populus hybridization gradient

Dylan G. Fischer, Stephen C. Hart, Carri J. LeRoy, Thomas G. Whitham

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

• Here, soil CO2 efflux, minirhizotron fine root production (FRP), and estimated total below-ground carbon allocation (TBCA) were examined along an elevation and hybridization gradient between two cottonwood species. • FRP was 72% greater under high-elevation Populus angustifolia, but soil CO2 efflux and TBCA were 62% and 94% greater, respectively, under low-elevation stands dominated by Populus fremontii, with a hybrid stand showing intermediate values. • Differences between the responses of FRP, soil CO2 efflux and TBCA may potentially be explained in terms of genetic controls; while plant species and hybridization explained variance in carbon flux, we found only weak correlations of FRP and TBCA with soil moisture, and no correlations with soil temperature or nitrogen availability. • Soil CO2 efflux and TBCA were uncorrelated with FRP, suggesting that, although below-ground carbon fluxes may change along environmental and genetic gradients, major components of below-ground carbon flux may be decoupled.

Original languageEnglish (US)
Pages (from-to)415-425
Number of pages11
JournalNew Phytologist
Volume176
Issue number2
DOIs
StatePublished - Oct 2007

Fingerprint

Populus
Carbon Cycle
Soil
hybridization
Carbon
Fluxes
carbon
Soils
soil
Populus angustifolia
Populus fremontii
Soil moisture
Nitrogen
soil temperature
Temperature
fine roots
soil water
Availability

Keywords

  • Cottonwood
  • Elevation gradient
  • Fine root production
  • Genetics x environment
  • Minirhizotron
  • Root production
  • Soil CO efflux
  • Total below-ground carbon allocation

ASJC Scopus subject areas

  • Plant Science
  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry

Cite this

Variation in below-ground carbon fluxes along a Populus hybridization gradient. / Fischer, Dylan G.; Hart, Stephen C.; LeRoy, Carri J.; Whitham, Thomas G.

In: New Phytologist, Vol. 176, No. 2, 10.2007, p. 415-425.

Research output: Contribution to journalArticle

Fischer, Dylan G. ; Hart, Stephen C. ; LeRoy, Carri J. ; Whitham, Thomas G. / Variation in below-ground carbon fluxes along a Populus hybridization gradient. In: New Phytologist. 2007 ; Vol. 176, No. 2. pp. 415-425.
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