Assessing carbon lability of particulate organic matter from delta C-13 changes following land-use change from C-3 native vegetation to C-4 pasture

Dalal, R. C., Cowie, B. A., Allen, D. E. and Yo, S. A. (2011) Assessing carbon lability of particulate organic matter from delta C-13 changes following land-use change from C-3 native vegetation to C-4 pasture. Soil Research, 49 1: 98-103. doi:10.1071/SR10083


Author Dalal, R. C.
Cowie, B. A.
Allen, D. E.
Yo, S. A.
Title Assessing carbon lability of particulate organic matter from delta C-13 changes following land-use change from C-3 native vegetation to C-4 pasture
Formatted title
Assessing carbon lability of particulate organic matter from δ13C changes following land-use change from C3 native vegetation to C4 pasture
Journal name Soil Research   Check publisher's open access policy
ISSN 1838-675X
1838-6768
Publication date 2011-02-01
Sub-type Article (original research)
DOI 10.1071/SR10083
Volume 49
Issue 1
Start page 98
End page 103
Total pages 6
Place of publication Collingwood, VIC, Australia
Publisher C S I R O Publishing
Language eng
Subject 1111 Nutrition and Dietetics
1904 Performing Arts and Creative Writing
2301 Environmental Science (miscellaneous)
Formatted abstract
Land-use change from C3 vegetation (δ13C values, –30‰ to –24‰) to C4 vegetation (δ13C values, –14‰ to –11‰) provides a useful quantitative technique for estimating organic C turnover in soil, even when total organic C changes are negligible. We utilised this technique to estimate C turnover in physically fractionated soil organic matter, particulate organic matter C (POM C >250 μm fraction and POM C 250–53 μm fraction), and the <53 μm fraction. There were small changes in total soil organic C (SOC) after 23 years of land-use change from native vegetation (mixed vegetation of Acacia harpophylla and Casuarina cristata) to buffel grass (Cenchrus ciliaris L. cv. Biloela) pasture grown on Vertosol–Dermosol–Sodosol soil types. The SOC values (t/ha) under native vegetation were: 31 ± 3 for the 0–0.1 m depth, 21 ± 1 for the 0.1–0.2 m depth, 15 ± 3 for the 0.2–0.3 m depth, and 16 ± 2 for the 0.3–0.4 m depth; the corresponding SOC values under pasture were 25 ± 2, 19 ± 2, 14 ± 2, and 13 ± 1 t/ha. The respective δ13C values in 0–0.1 m depths of the whole SOC and POM C >250 μm fraction changed from –25.5 ± 0.1‰ and –25.5 ± 0.3‰ under native vegetation to –20.1 ± 0.5‰ and –19.4 ± 0.2‰ under pasture. Similar, although smaller, differences were observed for other depths and SOC fractions. The SOC turnover periods (years) were 31 ± 6 for the 0–0.1 m depth, 60 ± 5 for the 0.1–0.2 m depth, 55 ± 15 for the 0.2–0.3 m depth, and 63 ± 20 for the 0.3–0.4 m depth; the corresponding turnover periods for the POM C >250 μm fraction were 13 ± 2, 19 ± 5, 14 ± 4, and 12 ± 5 years. The turnover periods of SOC in the POM C 250–53 μm and <53 μm fractions were similar to, or longer than, for the whole SOC at all depths studied. Thus, the lability of the SOC and SOC pools was in the order: POM C >250 μm fraction > POM C 53–250 μm fraction = POM C <53 μm fraction = whole SOC.
Keyword δ13C
C3
C4
Labile C
Particulate organic matter C
Soil organic C
delta13C
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
 
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