Previous land use and climate influence differences in soil organic carbon following reforestation of agricultural land with mixed-species plantings

England, Jacqueline R., Paul, Keryn I., Cunningham, Shaun C., Madhavan, Dinesh B., Baker, Thomas G., Read, Zoe, Wilson, Brian R., Cavagnaro, Timothy R., Lewis, Tom, Perring, Michael P., Herrmann, Tim and Polglase, Philip J. 2016, Previous land use and climate influence differences in soil organic carbon following reforestation of agricultural land with mixed-species plantings, Agriculture, ecosystems and environment, vol. 227, pp. 61-72, doi: 10.1016/j.agee.2016.04.026.

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Title Previous land use and climate influence differences in soil organic carbon following reforestation of agricultural land with mixed-species plantings
Author(s) England, Jacqueline R.
Paul, Keryn I.
Cunningham, Shaun C.
Madhavan, Dinesh B.
Baker, Thomas G.
Read, Zoe
Wilson, Brian R.
Cavagnaro, Timothy R.
Lewis, Tom
Perring, Michael P.
Herrmann, Tim
Polglase, Philip J.
Journal name Agriculture, ecosystems and environment
Volume number 227
Start page 61
End page 72
Total pages 12
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016-07-01
ISSN 1873-2305
Keyword(s) Labile organic carbon
Resistant organic carbon
Humus organic carbon
Plant litter
Carbon sequestration
Environmental plantings
Science & Technology
Life Sciences & Biomedicine
Agriculture, Multidisciplinary
Environmental Sciences
Environmental Sciences & Ecology
Summary Reforestation of agricultural land with mixed-species environmental plantings (native trees and shrubs) can contribute to mitigation of climate change through sequestration of carbon. Although soil carbon sequestration following reforestation has been investigated at site- and regional-scales, there are few studies across regions where the impact of a broad range of site conditions and management practices can be assessed. We collated new and existing data on soil organic carbon (SOC, 0-30 cm depth, N = 117 sites) and litter (N = 106 sites) under mixed-species plantings and an agricultural pair or baseline across southern and eastern Australia. Sites covered a range of previous land uses, initial SOC stocks, climatic conditions and management types. Differences in total SOC stocks following reforestation were significant at 52% of sites, with a mean rate of increase of 0.57 ± 0.06 Mg C ha-1 y-1. Increases were largely in the particulate fraction, which increased significantly at 46% of sites compared with increases at 27% of sites for the humus fraction. Although relative increase was highest in the particulate fraction, the humus fraction was the largest proportion of total SOC and so absolute differences in both fractions were similar. Accumulation rates of carbon in litter were 0.39 ± 0.02 Mg C ha-1 y-1, increasing the total (soil + litter) annual rate of carbon sequestration by 68%. Previously-cropped sites accumulated more SOC than previously-grazed sites. The explained variance differed widely among empirical models of differences in SOC stocks following reforestation according to SOC fraction and depth for previously-grazed (R2 = 0.18-0.51) and previously-cropped (R2 = 0.14-0.60) sites. For previously-grazed sites, differences in SOC following reforestation were negatively related to total SOC in the pasture. By comparison, for previously-cropped sites, differences in SOC were positively related to mean annual rainfall. This improved broad-scale understanding of the magnitude and predictors of changes in stocks of soil and litter C following reforestation is valuable for the development of policy on carbon markets and the establishment of future mixed-species environmental plantings.
Language eng
DOI 10.1016/j.agee.2016.04.026
Field of Research 050104 Landscape Ecology
050301 Carbon Sequestration Science
Socio Economic Objective 970105 Expanding Knowledge in the Environmental Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Elsevier
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