Afforestation of agricultural land with spotted gum (Corymbia citriodora)increases soil carbon and nitrogen in a Ferrosol

Mathers, Nicole and Dalal, Ram and Maraseni, Tek and Allen, Diane and Moody, Phil (2010) Afforestation of agricultural land with spotted gum (Corymbia citriodora)increases soil carbon and nitrogen in a Ferrosol. In: WCSS 2010: Soil Solutions for a Changing World, 1-6 Aug 2010, Brisbane, Australia.

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Abstract

Planting forests onto marginal ex-agricultural land may provide a relatively cost-effective way of creating a carbon sink where more CO2 is being removed from the atmosphere than is being released (sequestration), while simultaneously improving soil organic carbon (C) and nitrogen (N) stocks (organic matter) and fertility. Soil C and N stocks were measured in spotted gum (Corymbia citriodora spp. variegata) plantations (C3 vegetation) established on ex-pasture (C4 vegetation) sites compared with those in adjacent native vine scrub, pasture and peanut cropping in southeast Queensland (26°39’S, 151°45’E), Australia. The contribution of spotted gum to soil C was assessed using the natural 13C isotope dilution technique (δ13C). Soil C and N concentrations were greater under the 4-year-old spotted gum plantation than either the adjacent grazed pasture or peanut cropping soil and similar to the original native vine scrub in the 0-0.3 m depths. Similar trends were observed in the total soil N. The quantity of C sequestered belowground was estimated to be approximately 240 Mg CO2-e/ha in the entire 1.1 m soil profile after 25 years, indicating that afforestation may provide carbon offsets as an important source of future income as well as improved soil fertility (increased soil N) in the degraded agricultural lands of the South Burnett region in Queensland,Australia.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Authors retain copyright.
Depositing User: Mr Tek Maraseni
Faculty / Department / School: Historic - Faculty of Sciences - No Department
Date Deposited: 13 Oct 2010 05:53
Last Modified: 03 Jul 2013 00:03
Uncontrolled Keywords: stable isotopes; δ13C; soil C sequestration; afforestation; hardwood plantations
Fields of Research (FOR2008): 05 Environmental Sciences > 0503 Soil Sciences > 050301 Carbon Sequestration Science
07 Agricultural and Veterinary Sciences > 0705 Forestry Sciences > 070501 Agroforestry
07 Agricultural and Veterinary Sciences > 0701 Agriculture, Land and Farm Management > 070101 Agricultural Land Management
Socio-Economic Objective (SEO2008): D Environment > 96 Environment > 9614 Soils > 961402 Farmland, Arable Cropland and Permanent Cropland Soils
URI: http://eprints.usq.edu.au/id/eprint/8809

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