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

TitleLandform and vegetation patch type moderate the effects of grazing-induced disturbance on carbon and nitrogen pools in a semi-arid woodland
Publication TypeJournal Article
Year of Publication2012
AuthorsSmith JG, Eldridge DJ, Throop H.L.
JournalPlant and Soil
Volume360
Start Page405
Pagination405-419
Date Published05/2012
Accession NumberJRN00598
ARIS Log Number284957
KeywordsAustralia, carbon, grazing-induced disturbance, litter, nitrogen, nutrient pools, patch heterogeneity, soil organic carbon, spatial scale
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.

URL/files/bibliography/12-040.pdf
DOI10.1007/s11104-012-1288-2