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https://hdl.handle.net/2440/101734
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Type: | Journal article |
Title: | Previous land use and climate influence differences in soil organic carbon following reforestation of agricultural land with mixed-species plantings |
Author: | England, J.R. Paul, K.I. Cunningham, S.C. Madhavan, D.B. Baker, T.G. Read, Z. Wilson, B.R. Cavagnaro, T.R. Lewis, T. Perring, M.P. Herrmann, T. Polglase, P.J. |
Citation: | Agriculture, Ecosystems and Environment, 2016; 227:61-72 |
Publisher: | Elsevier |
Issue Date: | 2016 |
ISSN: | 0167-8809 1873-2305 |
Statement of Responsibility: | Jacqueline R. England, Keryn I. Paul, Shaun C. Cunningham, Dinesh B. Madhavan, Thomas G. Baker, Zoe Read, Brian R. Wilson, Timothy R. Cavagnaro, Tom Lewis, Michael P. Perring, Tim Herrmann, Philip J. Polglase |
Abstract: | 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. |
Keywords: | Labile organic carbon; resistant organic carbon; humus organic carbon; plant litter; carbon sequestration; environmental plantings; revegetation |
Rights: | © 2016 Elsevier B.V. All rights reserved. |
DOI: | 10.1016/j.agee.2016.04.026 |
Grant ID: | http://purl.org/au-research/grants/arc/LP0990038 http://purl.org/au-research/grants/arc/FT120100463 |
Published version: | http://dx.doi.org/10.1016/j.agee.2016.04.026 |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest 7 |
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hdl_101734.pdf | Accepted version | 556.36 kB | Adobe PDF | View/Open |
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