Incorporation of natural hydrocarbons from plant residues into an hydromorphic humic podzol following afforestation and fertilization |
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Authors: | P JAMBU A AMBLÈS H DINEL† B SECOUET |
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Institution: | Laboratoire de Pèdologie, URA 721;Laboratoire de Synthèse et Réactivitéde Produits Naturels, URA 489, Facultédes Sciences, 40 Avenue du Recteur Pineau, 86022 Poitiers Cedex, France;Land Resource Research Centre, Agriculture Canada, Ottawa, Ontario, KIA OC6, Canada |
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Abstract: | The content and composition of natural hydrocarbons from plant residues (Pinus maritima sp.) of a hydromorphic humic podzol were investigated following the addition of NPK and P fertilizers. L and F layers and the A, horizon from non-fertilized and fertilized soil were analysed for total lipids and hydrocarbons, and non-linear and linear hydrocarbons. The decrease in non-linear hydrocarbons extracted following the addition of fertilizers was attributed to the incorporation of non-linear hydrocarbons into humus, rather than to their biodegradation by soil micro-organisms. Short- and medium-chain linear hydrocarbons from plant residues or of microbial origin were rapidly biodegraded or fixed by soil micro-organisms, resulting in a very low concentration in the A, horizon. In contrast, long-chain linear hydrocarbons of plant origin accumulated in the non-fertilized soil, while the addition of P fertilizer slightly stimulated their biodegradation. oration is needed before firm conclusions can be drawn. |
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