Cited by 154Soil Carbon and Nitrogen DynamicsBioenergy crop production and managementSoil erosion and sediment transport

Soil Carbon Dynamics beneath Switchgrass as Indicated by Stable Isotope Analysis

Garten, C. T., Wullschleger, S. D.·2000·Journal of Environmental Quality

Abstract

Surface (0–40 cm) soil organic carbon (SOC) dynamics were studied beneath four switchgrass (Panicum virgatum L.) field trials in the southeastern United States. Soil organic carbon was partitioned into particulate organic matter (POM) and mineral‐associated organic matter (MOM). Most (75–90%) of the SOC at each study site was affiliated with MOM (<0.053 mm). Changes in stable carbon isotope ratios were used to derive carbon inputs to and losses from POM and MOM at each site. Inventories of existing SOC and new C 4‐derived SOC beneath switchgrass decreased with increasing soil depth. Approximately 5 yr after establishment, 19 to 31% of the existing SOC inventories beneath switchgrass had been derived from new C 4‐carbon inputs. Calculated turnover times of POM and MOM ranged from 2.4 to 4.3 yr and 26 to 40 yr, respectively. The turnover time of SOC in the POM fraction increased with decreasing mean annual temperature. A simple, two‐compartment model was parameterized to predict the potential for soil carbon sequestration under switchgrass. An example calculation with the model indicated a measurable and verifiable recovery of soil carbon (≈12% increase) on degraded lands through one decade of switchgrass production. The potential to sequester carbon through switchgrass cultivation will depend on initial soil carbon inventories, prevailing climate, soil type, and site management.

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Crossref · 10.2134/jeq2000.00472425002900020036x

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  • In switchgrass crops planted across a temperature gradient in North America, SOC turnover rate, the proportion of switchgrass-derived SOC, and net change in SOC all increased with temperature.

    “In switchgrass crops planted across a temperature gradient in North America, SOC turnover rate, the proportion of switchgrassderived SOC, and net change in SOC all increased with temperature (Garten & Wullschleger, 2000).”

    From Changes in soil organic carbon under biofuel crops (2009) · cites this paper as Garten & Wullschleger, 2000

  • Roots and rhizomes are a primary source of C to the soil in biofuel crops.

    “As roots and rhizomes are a primary source of C to the soil in biofuel crops (Garten & Wullschleger, 2000;Wilhelm et al., 2004;Lemus & Lal, 2005), belowground allocation of C stands to play a critical role in driving changes in SOC.”

    From Changes in soil organic carbon under biofuel crops (2009) · cites this paper as Garten & Wullschleger, 2000

  • Carbon sequestration by switchgrass has been nearly ubiquitous across a broad range of growing conditions throughout North America at rates of 1.7-10.1 Mg C ha-1 year-1.

    “Carbon sequestration by switchgrass has been nearly ubiquitous across a broad range of growing conditions throughout North America at rates of 1.7-10.1 Mg C ha -1 year -1 (6.2-37.0Mg CO 2 ha -1 year -1 ) [11,13,18,45].”

    From Soil Carbon Storage by Switchgrass Grown for Bioenergy (2008) · cites this paper as [13]

  • Switchgrass residues have a fast carbon turnover.

    “although its residues have a fast C turnover [25]”
  • Little information was available on parameters affecting soil organic carbon accumulation in slowly decomposable or recalcitrant forms.

    “Although some papers recorded specific fractions of SOC [11, 45, 46], little information was available on parameters affecting SOC accumulation in slowly decomposable or ‘recalcitrant’ forms [25, 35, 47].”

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Authors
Garten, C. T., & Wullschleger, S. D.
Affiliations
Oak Ridge National Laboratory (US)
Corresponding author
Garten, C. T.
Venue
Journal of Environmental Quality
Publisher
Wiley
Published
2000-03
Volume
29
Issue
2
Pages
645-653
ISSN
  • 0047-2425 (ISSN-L)
  • 1537-2537
OpenAlex
W2116496130
Cited by
154
References
0
Citations by year
2026: 2 · 2025: 3 · 2024: 3 · 2022: 4 · 2021: 7 · 2020: 13 · 2019: 6 · 2018: 3 · 2017: 8 · 2016: 6 · 2015: 8 · 2014: 6 · 2013: 5 · 2012: 10
FWCI
12.28
Type
journal article
Language
en
Open access
closed
Locations
Journal of Environmental Quality (publishedVersion)
Funders
McGill University
Topics
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
  • Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Bioenergy crop production and management
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil erosion and sediment transport
Keywords
soil organic carbon dynamics, switchgrass, particulate organic matter, mineral-associated organic matter, stable carbon isotopes, carbon turnover time, soil carbon sequestration, two-compartment model, degraded land, mean annual temperature, soil depth

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