Contrasting ecophysiology of two widespread arid zone tree species with differing access to water resources

Rachael H. Nolan, Tonantzin Tarin, Rizwana Rumman, James Cleverly, Kendal A. Fairweather, Sepideh Zolfaghar, Nadia S. Santini, Anthony P. O'Grady, Derek Eamus

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Arid environments can support the seemingly unlikely coexistence of species tolerant of, or sensitive to, dry soil moisture. Here, we examine water-use and carbon-gain traits in two widespread tree species in central Australia: Acaciaaptaneura and Eucalyptus camaldulensis. The former has a shallow root distribution and relies on soil moisture, while the latter is groundwater dependent. We hypothesised that A. aptaneura would exhibit a suite of characteristics that confer tolerance to low soil moisture, in contrast to E. camaldulensis. Consistent with our hypotheses A. aptaneura was relatively more anisohydric than E. camaldulensis(seasonal leaf water potential of −7.2 to −0.8 MPa cf. −1.4 to −0.3 MPa). Additionally, compared to E. camaldulensis, A. aptaneura had lower water potential at turgor loss (−2.5 cf. −1.1 MPa); a larger Huber value; smaller, narrower and thicker phyllodes/leaves; and larger photosynthetic capacity (Jmax); and larger water-use efficiency. Further, water-use efficiency for E. camaldulensis was similar to species receiving annual rainfall of 1500 mm, despite annual rainfall of 348 mm. We conclude that mean annual rainfall is the dominant determinant of water and carbon relations for A. aptaneura, but not E. camaldulensis. This has important implications for ecosystem-scale transpiration and primary productivity across this arid zone.
Original languageEnglish
Number of pages10
JournalJournal of Arid Environments
Volume153
DOIs
Publication statusPublished - 2018

Keywords

  • Acacia
  • Eucalyptus camaldulensis
  • gas exchange in plants
  • nitrogen
  • photosynthesis

Fingerprint

Dive into the research topics of 'Contrasting ecophysiology of two widespread arid zone tree species with differing access to water resources'. Together they form a unique fingerprint.

Cite this