TAILIEUCHUNG - Báo cáo lâm nghiệp:" Dynamics of litterfall in a chronosequence of Douglas-fir (Pseudotsuga menziesii Franco) stands in the Beaujolais mounts (France)"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài:" Dynamics of litterfall in a chronosequence of Douglas-fir (Pseudotsuga menziesii Franco) stands in the Beaujolais mounts (France)" | 475 Ann. For. Sci. 60 2003 475-488 INRA EDP Sciences 2003 DOI forest 2003041 Original article Dynamics of litterfall in a chronosequence of Douglas-fir Pseudotsuga menziesii Franco stands in the Beaujolais mounts France Jacques Ranger Frédéric Gerard Monika Lindemann Dominique Gelhaye Louisette Gelhaye INRA Centre de Nancy Unité Biogéochimie des Ecosystèmes Forestiers 54280 Champenoux France Received 29 April 2002 accepted 20 December 2002 Abstract - Litterfall is a major component of the carbon and nutrient cycles in forest ecosystems. Results of the present study are from a chronosequence of Douglas-fir stands monitored continuously for seven years. Aboveground litterfall was measured every three months sorted by components and analysed for major nutrients. Results make it possible to characterize the dynamics of organic matter and nutrient returns to the forest floor during stand development. Simple extrapolation was used to estimate the total return in litter cumulated over a 70-year-rotation length. Already published data were collected in order to try to identify simple relationships capable of predicting the litterfall return from structural stand characteristics. These models failed to be predictive due on the one hand to insufficient data and on the other hand to data not always perfectly comparable. Litterfall is a quantitative ecological measurement necessary to validate the models of ecosystem function. Douglas-fir litterfall nutrient cycling chronosequence litter traps Résumé - Dynamique des retombées de litière dans une chronoséquence de Douglas Pseudotsuga menziesii Franco située dans les Monts du Beaujolais France . Les retombées de litières représentent un paramètre écologique fonctionnel important des écosystèmes forestiers apportant des informations-clés sur le cycle du carbone et des éléments nutritifs. Les résultats présentés dans cette étude proviennent d une chronoséquence de trois peuplements de Douglas situés dans les Monts du .

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