Cropping Intensity Enhances Soil Organic Carbon and Nitrogen in a No‐Till Agroecosystem

Sherrod, Lucretia A.; Peterson, G. A.; Westfall, D. G.; Ahuja, Lajpat R.

doi:10.2136/sssaj2003.1533

Cited by 165 publications

(146 citation statements)

References 23 publications

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“…Combining site data could confound the C saturation analysis if C input level (I) co-varied with decomposition rate (k), resulting in an apparent saturation response of less SOC accumulation at high input levels because of faster decomposition rates due to optimal temperature and moisture conditions. We Sherrod et al 2003 Topographic location…”

Section: Resultsmentioning

confidence: 99%

Soil carbon saturation: concept, evidence and evaluation

et al. 2007

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Current estimates of soil C storage potential are based on models or factors that assume linearity between C input levels and C stocks at steady-state, implying that SOC stocks could increase without limit as C input levels increase. However, some soils show little or no increase in steady-state SOC stock with increasing C input levels suggesting that SOC can become saturated with respect to C input. We used long-term field experiment data to assess alternative hypotheses of soil carbon storage by three simple models: a linear model (no saturation), a one-pool whole-soil C saturation model, and a two-pool mixed model with C saturation of a single C pool, but not the whole soil. The one-pool C saturation model best fit the combined data from 14 sites, four individual sites were best-fit with the linear model, and no sites were best fit by the mixed model. These results indicate that existing agricultural field experiments generally have too small a range in C input levels to show saturation behavior, and verify the accepted linear relationship between soil C and C input used to model SOM dynamics. However, all sites combined and the site with the widest range in C input levels were best fit with the C-saturation model. Nevertheless, the same site produced distinct effective stabilization capacity curves rather than an absolute C saturation level. We conclude that the saturation of soil C does occur and therefore the greatest efficiency in soil C sequestration will be in soils further from C saturation.

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Section: Resultsmentioning

confidence: 99%

Soil carbon saturation: concept, evidence and evaluation

et al. 2007

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“…This is because the crop biomass yields and C inputs are often lower in drylands than in the humid regions due to limited precipitation and a shorter growing season. As a result, it often takes more time to enrich SOC (Halvorson et al, 2002a;Sherrod et al, 2003). Many studies have identified the potential of soils cultivated with different conservation practices (e.g., no-till) to sequester large amounts of carbon (C).…”

Section: Sequestrationmentioning

confidence: 99%

“…Improved soil and crop management practices, such as reduced tillage and increased cropping intensity, however, would increase SOC as compared to conventional practices (Halvorson et al, 2002a;Sherrod et al, 2003;Sainju et al, 2007). Many studies have reported that implementation of minimum tillage has occasionally caused yield losses, especially in the no tillage method (Rao, 1996;Kirkegaard et al, 1995;Silgram and Shepherd, 1999).…”

Section: Introductionmentioning

confidence: 99%

An Appraisal of Conservation Tillage on the Soil Properties and C Sequestration

Abrol¹,

Sharma²

2012

Resource Management for Sustainable Agriculture

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“…In the central Great Plains of the United States, Sherrod et al (2003) evaluated the effects of cropping frequency on SOC stocks over a 12-yr period. At three locations differing in potential evapotranspiration (PET), they situated sampling locations at summit, sideslope and toeslope positions.…”

Section: Representation Of Landscapementioning

confidence: 99%

Towards accurate measurements of soil organic carbon stock change in agroecosystems

VandenBygaart¹,

Angers²

2006

Can. J. Soil. Sci.

138

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VandenBygaart, A. J. and Angers, D. A. 2006. Towards accurate measurements of soil organic carbon stock change in agroecosystems. Can. J. Soil Sci. 86: [465][466][467][468][469][470][471]. In response to Kyoto Protocol commitments, countries can elect agricultural carbon sinks to offset emissions from other sectors, but they need to verify soil organic carbon (SOC) stock change. We summarize issues we see as barriers to obtaining accurate measures of SOC change, including: soil depth, bulk density and equivalent soil mass, representation of landscape components, experimental design, and the equilibrium status of the SOC. If the entire plow depth is not considered, rates of SOC storage under conservation compared with conventional tillage can be overstated. Bulk density must be measured to report SOC stock on an area basis. More critical still is the need to report SOC stock on an equivalent mass basis to normalize the effects of management on bulk density. Most experiments comparing SOC under differing management have been conducted in small, flat research plots. Although results obtained from these long-term experiments have been useful to develop and validate SOC prediction models, they do not adequately consider landscape effects. Traditional agronomic experimental designs can be inefficient for assessing small changes in SOC stock within large spatial variability. Sampling designs are suggested to improve statistical power and sensitivity in detecting changes in SOC stocks over short time periods. Auparavant toutefois, ils doivent vérifier l'évolution des stocks de carbone organique du sol (COS). Les auteurs résument les facteurs qui pourraient faire obstacle à une quantification précise des variations de COS, entre autres l'épaisseur du sol, la masse volumique apparente et la masse équivalente de sol, la représentation des composants du relief, la méthode expérimentale et l'état d'équilibre du COS. On pourrait surestimer le taux de stockage du COS lors du travail et du non-travail du sol si on ne tient pas compte de la profondeur de labour. Il faut mesurer la masse volumique apparente pour rapporter les stocks de COS en fonction de la surface. Il est encore plus crucial de rapporter les stocks de COS d'après leur masse équivalente afin de normaliser les effets de la gestion des terres sur la masse volumique apparente. La plupart des expériences où l'on compare le COS résultant de diverses pratiques culturales reposent sur de petites parcelles sans relief. Bien qu'ils aient eu leur utilité pour le développement et la validation des modèles de prévision du COS, les résultats issus de ces travaux de longue durée ne tiennent pas assez compte de l'incidence du relief. Les méthodes expérimentales traditionnelles en agronomie pourraient manquer d'efficacité pour évaluer les petites variations des stocks de COS quand il existe une importante variabilité spatiale. Les auteurs suggèrent des plans d'échan-tillonnage susceptibles d'améliorer la qualité des statistiques et de permettre une détection plus fine des variat...

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Cropping Intensity Enhances Soil Organic Carbon and Nitrogen in a No‐Till Agroecosystem

Cited by 165 publications

References 23 publications

Soil carbon saturation: concept, evidence and evaluation

Soil carbon saturation: concept, evidence and evaluation

An Appraisal of Conservation Tillage on the Soil Properties and C Sequestration

Towards accurate measurements of soil organic carbon stock change in agroecosystems

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