Plant and Soil

, Volume 360, Issue 1, pp 405–419

Landform and vegetation patch type moderate the effects of grazing-induced disturbance on carbon and nitrogen pools in a semi-arid woodland

  • Jane G. Smith
  • David J. Eldridge
  • Heather L. Throop
Regular Article

DOI: 10.1007/s11104-012-1288-2

Cite this article as:
Smith, J.G., Eldridge, D.J. & Throop, H.L. Plant Soil (2012) 360: 405. doi:10.1007/s11104-012-1288-2

Abstract

Background and aims

Dryland soil organic carbon (C) pools account for a large portion of soil C globally, but their response to livestock grazing has been difficult to generalize. We hypothesized that some difficulty generalizing was due to spatial heterogeneity in dryland systems. We examined the importance of heterogeneity at vegetation and landform scales on the response of litter and soil C and nitrogen (N) to grazing.

Methods

Litter and soil C and N pools were quantified in different vegetation microsites (tree, shrub, open) and landform elements (dune, swale) across a grazing disturbance gradient in an eastern Australia semi-arid woodland.

Results

Vegetation, landform, and grazing disturbance affected litter and soil C and N pools singly and through interactions. Resource pools were distributed unevenly across vegetation and landforms, and were largest beneath trees in swales. Grazing reduced pools in vegetation-landform combinations where pools were greatest. Pool increases from high to moderate disturbance sites were minimal.

Conclusions

Litter and soil C and N pools are strongly affected by livestock grazing, although responses to grazing relaxation may be non-linear. Accurately predicting C and N responses to grazing in drylands will require accounting for patch differences at multiple spatial scales.

Keywords

LitterNutrient poolsPatch heterogeneitySoil organic carbonSpatial scale

Abbreviations

SOC

Soil organic carbon

C

Carbon

N

Nitrogen

[SOC]

SOC concentration

[N]

Soil nitrogen concentration

SOCarea

SOC mass per area in g m−2

Narea

Soil N mass per area in g m−2

litterarea

Litter mass per area in g m−2

Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Jane G. Smith
    • 1
  • David J. Eldridge
    • 2
  • Heather L. Throop
    • 1
  1. 1.Biology DepartmentNew Mexico State UniversityLas CrucesUSA
  2. 2.Evolution and Ecology Research Centre, School of Biological, Earth and Environmental SciencesUniversity of New South WalesSydneyAustralia