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  • Ward et al Accepted author manuscript

    Rights statement: This is the peer reviewed version of the following article:Ward, S. E., Smart, S. M., Quirk, H., Tallowin, J. R. B., Mortimer, S. R., Shiel, R. S., Wilby, A. and Bardgett, R. D. (2016), Legacy effects of grassland management on soil carbon to depth. Glob Change Biol, 22: 2929–2938. doi:10.1111/gcb.13246 which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1111/gcb.13246/abstract This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.

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Legacy effects of grassland management on soil carbon to depth

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<mark>Journal publication date</mark>08/2016
<mark>Journal</mark>Global Change Biology
Issue number8
Volume22
Number of pages10
Pages (from-to)2929-2938
Publication statusPublished
Early online date8/02/16
Original languageEnglish

Abstract

The importance of managing land to optimise carbon sequestration for climate change mitigation is widely recognised, with grasslands being identified as having the potential to sequester additional carbon. However, most soil carbon inventories only consider surface soils, and most large scale surveys group ecosystems into broad habitats without considering management intensity. Consequently, little is known about the quantity of deep soil carbon and its sensitivity to management. From a nationwide survey of grassland soils to 1 m depth, we show that carbon in grasslands soils is vulnerable to management and that these management effects can be detected to considerable depth down the soil profile, albeit at decreasing significance with depth. Carbon concentrations in soil decreased as management intensity increased, but greatest soil carbon stocks (accounting for bulk density differences), were at intermediate levels of management. Our study also highlights the considerable amounts of carbon in sub-surface soil below 30cm, which is missed by standard carbon inventories. We estimate grassland soil carbon in Great Britain to be 2097 Tg C to a depth of 1 m, with ~60% of this carbon being below 30cm. Total stocks of soil carbon (t ha−1) to 1 m depth were 10.7% greater at intermediate relative to intensive management, which equates to 10.1 t ha−1 in surface soils (0-30 cm), and 13.7 t ha−1 in soils from 30-100 cm depth. Our findings highlight the existence of substantial carbon stocks at depth in grassland soils that are sensitive to management. This is of high relevance globally, given the extent of land cover and large stocks of carbon held in temperate managed grasslands. Our findings have implications for the future management of grasslands for carbon storage and climate mitigation, and for global carbon models which do not currently account for changes in soil carbon to depth with management.

Bibliographic note

This is the peer reviewed version of the following article: Ward, S. E., Smart, S. M., Quirk, H., Tallowin, J. R. B., Mortimer, S. R., Shiel, R. S., Wilby, A. and Bardgett, R. D. (2016), Legacy effects of grassland management on soil carbon to depth. Glob Change Biol, 22: 2929–2938. doi:10.1111/gcb.13246 which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1111/gcb.13246/abstract This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.