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ISSN : 2287-8327

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Vol.28 No.4
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Dynamic of Carbon Sequestered in Concentric Layers of Soil Macroaggregates

Journal of Ecology and Environment / Journal of Ecology and Environment, (P)2287-8327; (E)2288-1220
2005, v.28 no.4, pp.181-188

Alvin
J.M. Smucker
Alvin, , & J.M., S. (2005). Dynamic of Carbon Sequestered in Concentric Layers of Soil Macroaggregates. Journal of Ecology and Environment, 28(4), 181-188.
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Abstract

Methods used to study carbon sequestration by soil aggregates have often excluded the concentricspatial variability and other dynamic processes that contribu and solute transport within aggregates. We investigated the spatial gradients of carbon (C) and nitrogen (N) from the exterior to interior layers within macroaggregates, 6.3~9.5 mm, sampled from conventional tillage (CT) and no tillage (NT) sites of a Hoytville silt clay loam. Spatial gradients in C accumulation within macroaggregates were related to the differences in C dynamics by determining the sizes and the turnover rates of fast C and slow C pools in the concentric layers of aggregates. Aggregate exteriors contained more labile C and were characterized by greater C mineralization rates than their interiors in both management systems. In contrast, C in the interior layers of aggregates was more resistant in both systems. These results indicated the spatial diferentiation of C dynamics within macroaggregates, i.e., exterior layers as a reactive site and interior layers as a protective site. Greater total C distribution in the exterior layers of NT aggregates indicated more influx of C from the macropores in interaggregate space than C mineralization (net gain of C), whereas lower C distribution within the exterior layers of CT aggregates indicated net loss of C by greater C mineralization than C influx. We found total C increased approximately 1.6-fold by the conversion of CT soils to NT management systems for a period of 36 years. Differences in total accumulation and the spatial distribution of C within aggregates affected by management were attributed to the differences in heterogeneities of resource availability and microbial activity within aggregates.

keywords
Carbon sequestration, Concentric layers of aggregates, Fast C pool, Mean residence time, Slow Cpool, Soil aggregates

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