Fate of particulate organic matter in soil aggregates during cultivation

European Journal of Soil Science - Tập 47 Số 4 - Trang 495-503 - 1996
E. Besnard1, Claire Chenu1, Jérôme Balesdent2, P. Puget1, Dominique Arrouays3
1Unité de Science du Sol, INRA, 78026 Versailles Cedex, France,
2Laboratoire de Biogéochimie Isotopique, Université Paris VI–INRA –CNRS, Case 120, 4 Place Jussieu, 75252 Paris Cedex 05, France
3Service ďEtude des Sols et de la Carte Pédologique de France, INRA, 33140 Pont de la Maye, France

Tóm tắt

SummaryParticulate organic matter (POM) is a labile fraction of soil organic matter which is thought to be physically protected from biodegradation when within soil aggregates. We have developed a fractionation method to separate POM located outside stable soil macroaggregates (> 200 μm) and microaggregates (50–200 μm) from that within them, and applied it to a cultivation sequence of humic loamy soils. The natural abundance of 13C was used to determine the amounts of POM derived from forest and that derived from crop in the free and occluded fractions. In the forest soil the free and occluded POM fractions had the same composition, morphology and isotopic signature. On cultivation the amounts of POM decreased sharply. The loss of C in the POM from forest was mainly from POM outside the aggregates. The POM occluded within microaggregates was found to turnover slowly. This may be due either to its recalcitrant chemical nature or to its physical protection within microaggregates

Từ khóa


Tài liệu tham khảo

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Thông tin xuất bản

European Journal of Soil Science

Tập 47 Số 4

495-503

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