Woody plant encroachment into grasslands leads to accelerated erosion of previously stable organic carbon from dryland soils

A - Papers appearing in refereed journals

Puttock, A., Dungait, J. A. J., Macleod, C. J. A., Bol, R. and Brazier, R. E. 2014. Woody plant encroachment into grasslands leads to accelerated erosion of previously stable organic carbon from dryland soils. Journal of Geophysical Research-Biogeosciences. 119 (12), pp. 2345-2357.

AuthorsPuttock, A., Dungait, J. A. J., Macleod, C. J. A., Bol, R. and Brazier, R. E.
Abstract

Drylands worldwide are experiencing rapid and extensive environmental change, concomitant with the encroachment of woody vegetation into grasslands. Woody encroachment leads to changes in both the structure and function of dryland ecosystems and has been shown to result in accelerated soil erosion and loss of soil nutrients. Covering 40% of the terrestrial land surface, dryland environments are of global importance, both as a habitat and a soil carbon store. Relationships between environmental change, soil erosion, and the carbon cycle are uncertain. There is a clear need to further our understanding of dryland vegetation change and impacts on carbon dynamics. Here two grass-to-woody ecotones that occur across large areas of the southwestern United States are investigated. This study takes a multidisciplinary approach, combining ecohydrological monitoring of structure and function and a dual-proxy biogeochemical tracing approach using the unique natural biochemical signatures of the vegetation. Results show that following woody encroachment, not only do these drylands lose significantly more soil and organic carbon via erosion but that this includes significant amounts of legacy organic carbon which would previously have been stable under grass cover. Results suggest that these dryland soils may not act as a stable organic carbon pool, following encroachment and that accelerated erosion of carbon, driven by vegetation change, has important implications for carbon dynamics.

KeywordsEnvironmental Sciences; Geosciences, Multidisciplinary
Year of Publication2014
JournalJournal of Geophysical Research-Biogeosciences
Journal citation119 (12), pp. 2345-2357
Digital Object Identifier (DOI)doi:10.1002/2014JG002635
Open accessPublished as bronze (free) open access
FunderUniversity of Exeter
British Society for Geomorphology
Biotechnology and Biological Sciences Research Council
Publisher's version
PublisherWiley
American Geophysical Union
Grant IDDEB-0217774
ISSN2169-8953

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