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Bioavailability of soil organic carbon and Fe as influenced by forestry practices in a subtropical coastal catchment

Lin, Chaofeng, Larsen, Eloise, Grace, Peter, & Smith, James (2010) Bioavailability of soil organic carbon and Fe as influenced by forestry practices in a subtropical coastal catchment. In Gilkes, R & Prakongkep, N (Eds.) Soil Solutions for a Changing World: proceedings of the 19th World Congress of Soil Science, 1 - 6 August, 2010, Australia, Queensland, Brisbane.

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Abstract

Potential impacts of plantation forestry practices on soil organic carbon and Fe available to microorganisms were investigated in a subtropical coastal catchment. The impacts of harvesting or replanting were largely limited to the soil top layer (0–10 cm depth). The thirty-year-old Pinus plantation showed low soil moisture content (Wc) and relatively high levels of soil total organic carbon (TOC). Harvesting and replanting increased soil Wc but reduced TOC levels. Mean dissolved organic carbon (DOC) and microbial biomass carbon (MBC) increased in harvested or replanted soils, but such changes were not statistically significant (P

0.05). Total dithionite-citrate and aqua regia-extractable Fe did not respond to forestry practices, but acid ammonium oxalate and pyrophosphate-extractable, bioavailable Fe decreased markedly after harvesting or replanting. Numbers of heterotrophic bacteria were significantly correlated with DOC levels (P < 0.05), whereas Fe-reducing bacteria and S-bacteria detected using laboratory cultivation techniques did not show strong correlation with either soil DOC or Fe content.

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ID Code: 37653
Item Type: Conference Paper
Keywords: Subtropical catchment, forestry management, soil carbon, Fe biogeochemistry, soil bacteria
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Current > Institutes > Institute of Health and Biomedical Innovation
Past > Institutes > Institute for Sustainable Resources
Deposited On: 01 Oct 2010 13:49
Last Modified: 01 Mar 2012 00:17

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