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Plant and Soil

, 348:471 | Cite as

Spatial analysis of fine root distribution on a recently constructed ecosystem in a water-limited environment

  • Willis Gwenzi
  • Erik J. Veneklaas
  • Karen W. Holmes
  • Timothy M. Bleby
  • Ian R. Phillips
  • Christoph Hinz
Regular Article

Abstract

Aims:

(1) to investigate the spatial distribution of fine roots and its correlation with selected soil properties on an artificial ecosystem dominated by woody vegetation species, and (2) to compare the root distribution to that predicted using a global model for natural ecosystems.

Methods:

Root diameter distribution (≤ 5 mm), root biomass density (RBD), root length density (RLD), soil pH, soil electrical conductivity and dry soil bulk density were measured on soil core samples (217) collected from a trench wall using a 20 × 20-cm grid sampling.

Results:

Approximately 90% of the RBD (mean ± standard error: 0.27 ± 0.027 kg m−3) and RLD (1.57 ± 0.023 cm cm−3) occurred in the top 40 cm, decreasing exponentially to a maximum rooting depth of 150 cm. RBD exhibited a vertical spatial structure associated with soil pH (p < 0.05; r2 = 0.48), and a random lateral distribution. Coefficients of variation (CV) of RBD were high irrespective of orientation (vertical: 79–200%, lateral: 50–236%). The root extinction parameter β (0.944) for the global model was lower (p < 0.05) than that of woodlands (β = 0.964–0.976), indicating a shallow root distribution resembling that of grasslands (β = 0.943).

Conclusions:

The superficial root distribution indicated subsoil chemical constraints to root growth, while high lateral variability was attributed to sparse vegetation. The findings stress the need to account for both vertical and lateral variability of roots for accurate modelling of water use and productivity on certain artificial ecosystems with sparse vegetation.

Keywords

Global root distribution model Vegetated engineered cover Root biomass density Root diameter distribution Root length density 

Abbreviations

EC

Soil electrical conductivity in 1:5 soil to water suspension

RBD

Root biomass density

RLD

Root length density

BD

Dry soil bulk density

Notes

Acknowledgements

The authors thank the anonymous reviewers whose insightful critique of the manuscript significantly improved it. We are also grateful to the Cover Project (Ex-Australian Centre for Mining Environmental Research) for research funding. The design and implementation of the experiment, and analysis and interpretation of the data were solely the responsibilities of the authors. Scholarship support for WG was provided by The University of Western Australia through the Scholarship for International Research Fees (SIRF), University Postgraduate Award (International Student) (UPAIS) and an Ad-hoc top-up scholarship. Mr. Johannes Albers assisted with fieldwork and laboratory analysis.

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Willis Gwenzi
    • 1
    • 2
  • Erik J. Veneklaas
    • 2
  • Karen W. Holmes
    • 3
    • 4
  • Timothy M. Bleby
    • 2
  • Ian R. Phillips
    • 5
  • Christoph Hinz
    • 1
  1. 1.School of Earth and EnvironmentThe University of Western AustraliaPerthAustralia
  2. 2.School of Plant BiologyThe University of Western AustraliaPerthAustralia
  3. 3.Centre of Excellence for Ecohydrology, School of Environmental Systems EngineeringThe University of Western AustraliaPerthAustralia
  4. 4.Department of Agriculture and Food Western AustraliaSouth PerthAustralia
  5. 5.Alcoa World Alumina AustraliaPinjarra, Australia

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