tailieunhanh - Báo cáo khoa học: "Répartition des nutriments dans un sol brun acide développé sur tuf (Beaujolais, France). Conséquences pour l’évolution de la fertilité minérale à long terme A Ezzaïm*"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Répartition des nutriments dans un sol brun acide développé sur tuf (Beaujolais, France). Conséquences pour l’évolution de la fertilité minérale à long terme A Ezzaïm*. | Ann Sci For 1997 54. 371 -387 Elsevier Inra 371 Article original Repartition des nutriments dans un sol brun acide développé sur tuf Beaujolais France . Consequences pour 1 évolution de la fertilite minérale à long terme A Ezzaim MP Turpault J Ranger Équipe cycles biogéochimŨỊues centre Inra de Nancy 54280 Champenoux France Reẹu le 24 avril 1996 accepté le 24 juillet 1996 Summary Nutrient distribution in an acid brown soil developed from a volcanic tuff bedrock Beaujolais France . Consequences for the long-term fertility. The study of soil fertility often measured only by its short-term component ie exchangeable cation reserves appears insufficient and can mask different situations. This work shows that the middle and long-term fertility characterized by the nutrient content of minerals of three acid brown soils was very different although their exchangeable cation reserves were comparable. The middle and long-term fertility of these soils corresponds to reserves of nutrient elements in the fresh tuff in the weathered tuff and in the coarse soil fractions originating from the desquamation of the weathered tuff. Differences in the fertility of these three soils were due to the colluviation and to the intense hydrothermalism that affected the very top layer of tuff and provoked a major calcium depletion in the bedrock. Calcium appeared to be the first limiting factor for plant nutrition in this ecosystem. Only the flux of calcium originating from the dissolution of calcic primary minerals in the soil fractions 2 pm was able to maintain the temporary reserve of this element on the adsorbing complex and to meet the nutritional demands of the Dou-glas-fir stand. The stability of this ecosystem therefore depends mainly on the rate of calcium flux originating from minerals located in the coarse soil fractions assuming that the organic matter compartment is stable. mineral fertility long-term reserve acid brown soil ecosystem stability Douglas Pseudotsuga menziessii Franco