Soil organic carbon dynamics in cleared temperate forest spodosols converted to maize cropping |
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Authors: | Jolivet Claudy Arrouays Dominique Andreux Francis Lévèque Jean |
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Institution: | (1) Institut National de la Recherche Agronomique, Unité de Science du Sol, Service d'Etude des Sols et de la Carte Pédologique de France, 45160 Ardon, France;(2) [Géosol, Centre des Sciences de la Terre, Université de Bourgogne, 6 Bd Gabriel, 21000 Dijon, France |
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Abstract: | In southwest France, sandy spodosols have developed from Quaternary sandy eolian deposits. On these soils, numerous forest lands have been converted to continuous intensive maize cropping. A chronosequence study is realized by comparing organic C pools and 13C natural abundance of one forested and 6 agricultural sites, whose ages of cultivation range from 4 to 32 yr. 13C ratio is found to increase with time of cultivation. After 3 decades of intensive maize cropping, about half of the initial organic C content in the forest topsoil layer has disappeared. The fraction of C derived from maize crop increases during the first decades of cultivation, but its level is significantly lower than those observed in other soils, which indicates a high mineralization rate of organic C. In this context, soil characteristics associated to intensive agricultural practices lead to a rapid and large loss of C, whereas inputs from maize seem to have only a very small long-term contribution. |
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Keywords: | 13C isotope changes in soil forest clearing maize crop soil organic carbon |
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