Cited by 829Soil Carbon and Nitrogen DynamicsPasture and Agricultural SystemsSoil erosion and sediment transport

Effects of grazing on grassland soil carbon: a global review

McSherry, Megan E., Ritchie, Mark E.·2013·Global Change Biology

Abstract

Soils of grasslands represent a large potential reservoir for storingCO2, but this potential likely depends on how grasslands are managed for large mammal grazing. Previous studies found both strong positive and negative grazing effects on soil organic carbon (SOC) but explanations for this variation are poorly developed. Expanding on previous reviews, we performed a multifactorial meta‐analysis of grazer effects on SOC density on 47 independent experimental contrasts from 17 studies. We explicitly tested hypotheses that grazer effects would shift from negative to positive with decreasing precipitation, increasing fineness of soil texture, transition from dominant grass species with C 3 to C 4 photosynthesis, and decreasing grazing intensity, after controlling for study duration and sampling depth. The six variables of soil texture, precipitation, grass type, grazing intensity, study duration, and sampling depth explained 85% of a large variation (±150 g m−2 yr−1) in grazing effects, and the best model included significant interactions between precipitation and soil texture (P = 0.002), grass type, and grazing intensity (P = 0.012), and study duration and soil sampling depth (P = 0.020). Specifically, an increase in mean annual precipitation of 600 mm resulted in a 24%decrease in grazer effect size on finer textured soils, while on sandy soils the same increase in precipitation produced a 22%increase in grazer effect on SOC. Increasing grazing intensity increased SOC by 6–7% on C 4‐dominated and C 4–C 3 mixed grasslands, but decreased SOC by an average 18% in C 3‐dominated grasslands. We discovered these patterns despite a lack of studies in natural, wildlife‐dominated ecosystems, and tropical grasslands. Our results, which suggest a future focus on why C 3 vs. C 4‐dominated grasslands differ so strongly in their response of SOC to grazing, show that grazer effects on SOC are highly context‐specific and imply that grazers in different regions might be managed differently to help mitigate greenhouse gas emissions.

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Crossref · 10.1111/gcb.12144

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77 of 77 references verified0 citation errors · 0 not checkable

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  • Heavy grazing decreases soil organic carbon content in grassland dominated by C3 photosynthetic pathway vegetation and increases soil organic carbon content in mixed and C4 photosynthetic-type grasslands.

    “A meta-analysis of studies found that heavy grazing decreases soil organic carbon content in grassland dominated by vegetation of the C3 photosynthetic pathway and increased soil organic carbon content in mixed and C4 photosynthetic-type grasslands (37).”

    From Restoring Degraded Lands (2021) · cites this paper as [37]

  • Grazing cattle on dry rangeland with little to no carbon opportunity cost could have a small carbon footprint when the grazing also increases soil organic carbon.

    “This suggests that grazing cattle on dry rangeland with little to no carbon opportunity cost could have a small carbon footprint when the grazing also increases soil organic carbon, as has been observed in some studies of dry rangeland with finer textured soil [12].”
  • Large soil carbon sequestration rates are only possible under particular agro-ecological conditions and for a limited time period.

    “Yet large soil carbon sequestration rates are only possible under particular agro-ecological conditions and for a limited time period [9, 12].”
  • There is evidence that increasing grazing intensity may have different effects in C3 versus C4 dominated pastures.

    “Additionally, there is evidence that increasing grazing intensity may have different effects in C3 versus C4 dominated pastures [30].”
  • Soil carbon sequestration is a critical ecosystem service of grasslands that can be maximized using best management practices for livestock grazing.

    “Soil C sequestration is a critical ecosystem service of grasslands, which can be maximized using best management practices for livestock grazing”

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Authors
McSherry, M. E., & Ritchie, M. E.
Affiliations
Syracuse University (US)
Corresponding author
McSherry, Megan E.
Venue
Global Change Biology
Publisher
Wiley
Published
2013-02-26
Volume
19
Issue
5
Pages
1347-1357
ISSN
  • 1354-1013 (ISSN-L)
  • 1365-2486
OpenAlex
W2159741556
Cited by
829
References
77
Citations by year
2026: 77 · 2025: 107 · 2024: 89 · 2023: 78 · 2022: 84 · 2021: 87 · 2020: 74 · 2019: 55 · 2018: 44 · 2017: 45 · 2016: 39 · 2015: 31 · 2014: 13 · 2013: 6
FWCI
3.70
Type
journal article
Language
en
Open access
closed
Locations
  • Global Change Biology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
  • Life Sciences › Agricultural and Biological Sciences › Forestry › Pasture and Agricultural Systems
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil erosion and sediment transport
Keywords
grazing, soil organic carbon, grazing intensity, precipitation, soil texture, C3 and C4 grasses, carbon sequestration, soil carbon density, grazing management, greenhouse gas emissions reduction
MeSH terms
Animals, Carbon, Feeding Behavior, Poaceae, Soil, Ecosystem, Food Chain, Livestock

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