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Characterising the biophysical, economic and social impacts of soil carbon sequestration as a greenhouse gas removal technology.

Authors
  • Sykes, Alasdair J1
  • Macleod, Michael1
  • Eory, Vera1
  • Rees, Robert M1
  • Payen, Florian1, 2
  • Myrgiotis, Vasilis2
  • Williams, Mathew2
  • Sohi, Saran2
  • Hillier, Jon3
  • Moran, Dominic3
  • Manning, David A C4
  • Goglio, Pietro5
  • Seghetta, Michele5
  • Williams, Adrian5
  • Harris, Jim5
  • Dondini, Marta6
  • Walton, Jack6
  • House, Joanna7
  • Smith, Pete6
  • 1 Scotland's Rural College (SRUC), Edinburgh, UK.
  • 2 School of Geosciences, The University of Edinburgh, Edinburgh, UK.
  • 3 Global Academy of Agriculture and Food Security, The University of Edinburgh, Midlothian, UK.
  • 4 School of Natural and Environmental Sciences, Newcastle University, Newcastle-upon Tyne, UK.
  • 5 School of Water, Energy and Environment, Cranfield University, Bedford, UK.
  • 6 Institute of Biological & Environmental Sciences, University of Aberdeen, Aberdeen, UK.
  • 7 Cabot Institute, University of Bristol, Bristol, UK.
Type
Published Article
Journal
Global Change Biology
Publisher
Wiley (Blackwell Publishing)
Publication Date
Mar 01, 2020
Volume
26
Issue
3
Pages
1085–1108
Identifiers
DOI: 10.1111/gcb.14844
PMID: 31532049
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

To limit warming to well below 2°C, most scenario projections rely on greenhouse gas removal technologies (GGRTs); one such GGRT uses soil carbon sequestration (SCS) in agricultural land. In addition to their role in mitigating climate change, SCS practices play a role in delivering agroecosystem resilience, climate change adaptability and food security. Environmental heterogeneity and differences in agricultural practices challenge the practical implementation of SCS, and our analysis addresses the associated knowledge gap. Previous assessments have focused on global potentials, but there is a need among policymakers to operationalise SCS. Here, we assess a range of practices already proposed to deliver SCS, and distil these into a subset of specific measures. We provide a multidisciplinary summary of the barriers and potential incentives towards practical implementation of these measures. First, we identify specific practices with potential for both a positive impact on SCS at farm level and an uptake rate compatible with global impact. These focus on: (a) optimising crop primary productivity (e.g. nutrient optimisation, pH management, irrigation); (b) reducing soil disturbance and managing soil physical properties (e.g. improved rotations, minimum till); (c) minimising deliberate removal of C or lateral transport via erosion processes (e.g. support measures, bare fallow reduction); (d) addition of C produced outside the system (e.g. organic manure amendments, biochar addition); (e) provision of additional C inputs within the cropping system (e.g. agroforestry, cover cropping). We then consider economic and non-cost barriers and incentives for land managers implementing these measures, along with the potential externalised impacts of implementation. This offers a framework and reference point for holistic assessment of the impacts of SCS. Finally, we summarise and discuss the ability of extant scientific approaches to quantify the technical potential and externalities of SCS measures, and the barriers and incentives to their implementation in global agricultural systems. © 2019 The Authors. Global Change Biology published by John Wiley & Sons Ltd.

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