2016
DOI: 10.2489/jswc.71.3.68a
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Soil carbon sequestration potential of US croplands and grasslands: Implementing the 4 per Thousand Initiative

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Cited by 118 publications
(60 citation statements)
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“…It was originally suggested that, if this rate of C sequestration was achieved for all soils globally to a depth of 40 cm, the C removed from the atmosphere would equal annual CO 2 –C emissions from fossil fuels of 8.9 Gt and thus “halt the annual increase in CO 2 in the atmosphere” (http://4p1000.org/understand). Later enunciations of the initiative have recognized that increases in SOC are only likely in soils that are being actively managed for agriculture (and possibly under managed forestry) and, even in these, such a rate of increase may not be achievable everywhere (Chabbi et al., ; Chambers, Lal, & Paustian, ; Lal, ; Minasny et al., ). It is suggested that C sequestration in agricultural soils alone, as opposed to all soils, might be limited to c .…”
Section: Introductionmentioning
confidence: 99%
“…It was originally suggested that, if this rate of C sequestration was achieved for all soils globally to a depth of 40 cm, the C removed from the atmosphere would equal annual CO 2 –C emissions from fossil fuels of 8.9 Gt and thus “halt the annual increase in CO 2 in the atmosphere” (http://4p1000.org/understand). Later enunciations of the initiative have recognized that increases in SOC are only likely in soils that are being actively managed for agriculture (and possibly under managed forestry) and, even in these, such a rate of increase may not be achievable everywhere (Chabbi et al., ; Chambers, Lal, & Paustian, ; Lal, ; Minasny et al., ). It is suggested that C sequestration in agricultural soils alone, as opposed to all soils, might be limited to c .…”
Section: Introductionmentioning
confidence: 99%
“…The rate of increase in water holding capacity is variable depending on soil texture, soil management practices, land type (rangeland versus cropland, for example) and land use configuration, and climate (Poulton et al 2018). In comparison to hardwood woodland, soil management practices are more feasible on grassland, and likely to be even more feasible on agricultural land intensively managed to increase soil organic carbon (Chambers et al 2016, Minasny et al 2017. By 2050 in all scenarios, grassland and woodland are the dominant land covers across all conservation easements, though Tehama and San Luis Obispo are the two counties with the greatest proportion of grassland area within their modeled easement locations.…”
Section: Discussionmentioning
confidence: 99%
“…On all working lands, BCM model runs assumed adoption of one or more soil management practices that increase SOM by 3% from baseline USDA SSURGO mapped SOM (Flint et al 2018). This assumption is based on studies showing that standard soil conservation practices such as reduced tillage, cover cropping, and adding livestock manures and compost, can lead to significant increases in SOM concentration and mass over time, particularly when applied together in a comprehensive conservation agriculture scenario (Lal 2015, Chambers et al 2016.…”
Section: Methods: Scenario Development and Analysismentioning
confidence: 99%
“…Despite the variability of measured responses to improved management, conservation practices and climate change reported in the literature (Alexander, Paustian, Smith, & Moran, 2015;Bruce et al, 1999;FAO, 2011;IPCC, 1996;Lorenz & Lal, 2016;Minasny et al, 2017a), in most cases, measured C sequestration rates are less than 0.5 to 1 Mg C ha −1 yr −1 when long-term observational data (>20 yr) are considered. For the United States, for example, Chambers, Lal, and Paustian (2016) reported annual rates of 0.3-0.5 Mg C ha −1 for cropland and 0.04-0.21 Mg C ha −1 for grazing land, while long-term studies covering the globe as reviewed by Minasny et al (2017) point at an average annual rate of 0.2-0.6 Mg C ha −1 . Similar values, or best estimates, are used here for possible annual C gains in croplands and grasslands, by bioclimatic zone (M1, see Table 1).…”
Section: Assumptions and Scenariosmentioning
confidence: 99%