Total and young organic matter distributions in aggregates of silty cultivated soils

European Journal of Soil Science - Tập 46 Số 3 - Trang 449-459 - 1995
P. Puget1, Claire Chenu1, Jérôme Balesdent2
1Unité de Science du Sol, I.N.R.A., 78026 Versailles Cedex, France
2Laboratoire de Biogéochimie Isotopique (I.N.R.A.), Université Pierre et Marie Curie, Case 120, 4 Place Jussieu, 75252 Paris Cedex 05, France

Tóm tắt

SummaryThe distribution of organic matter in soil aggregates was investigated by fractionating aggregates and measuring carbon contents. The distribution of recently incorporated organic carbon was analyzed using 13C natural abundance. The soils of the experiment, which previously only had C3 vegetation, were cropped to maize, aC4 plant, for 6 or 23 years.Aggregate size distributions were determined for silty soils with different organic matter contents. Slaking‐resistant macroaggregates were enriched in C as compared to dry‐sieved macroaggregates or to microaggregates, and the C content increased with the size of aggregates. The δ13C value was used to calculate the amount of C3‐derived and C4‐derived organic carbon in the fractions. The larger carbon contents in stable macroaggregates were due to young C4‐derived organic carbon (<6 or 23 years), and we concluded that young organic matter was responsible for macroaggregate stability.

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European Journal of Soil Science

Tập 46 Số 3

449-459

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