tailieunhanh - Báo cáo lâm nghiệp: "Effects of the clear-cutting of a Douglas-fir plantation (Pseudotsuga menziesii F.) on the chemical composition of soil solutions and on the leaching of DOC and ions in drainage waters"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Effects of the clear-cutting of a Douglas-fir plantation (Pseudotsuga menziesii F.) on the chemical composition of soil solutions and on the leaching of DOC and ions in drainage waters. | Ann. For. Sci. 64 2007 183-200 INRA EDP Sciences 2007 DOI forest 2006103 183 Original article Effects of the clear-cutting of a Douglas-fir plantation Pseudotsuga menziesii F. on the chemical composition of soil solutions and on the leaching of DOC and ions in drainage waters Jacques Ranger Sylvain LOYER Dominique Gelhaye Benoit POLLIER Pascal BONNAUD INRA Centre de Recherche de Nancy Unité Biogéochimie des Écosystèmes Forestiers 54280 Champenoux France Received 10 February 2006 accepted 27 September 2006 Abstract - The effects of the clear-cutting of a 70-year-old Douglas-fir plantation on the chemical composition of soil solutions and on leaching of nutrients in drainage waters were observed by a continuous monitoring six years before and three years after the cutting. Forest harvesting was made with very limited soil disturbances. Results showed that the concentration of weakly fixed solutions did not change but that the concentration of gravitational solutions of the upper soil layers drastically fell down after the cutting. The limited increase in nutrients leached with drainage waters was only due to the increase in the water flux which is difficult to quantify because of the presence of ground vegetation. The monitoring of numerous fluxes before and after the clear-cutting could explain the specific behaviour of the soil solutions. The limited losses of nutrients the after clear-cutting in a potentially responsive ecosystem were unexpected. The initial hypothesis was that the decrease in the mineralization and nitrification rates observed after the cutting was related to a stimulating effect of Douglas-fir on the activity of soil nitrifyers. Douglas-fir clear-cutting soil solutions nutrients leaching Résumé - Effet de la coupe à blanc d un peuplement de Douglas Pseudotsuga menziesii F. sur la composition chimique des solutions du sol et sur le flux d éléments drainés. Les effets de la coupe à blanc d une plantation de Douglas de 70 ans ont été .