TAILIEUCHUNG - Báo cáo lâm nghiệp: "Interannual variation of soil respiration in a beech forest ecosystem over a six-year study"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Interannual variation of soil respiration in a beech forest ecosystem over a six-year study. | Ann. For. Sci. 61 2004 499-505 INRA EDP Sciences 2004 DOI forest 2004044 499 Original article Interannual variation of soil respiration in a beech forest ecosystem over a six-year study Daniel EPRONa b Jérome NGAOc André Granierc a Laboratoire de Biologie et Écophysiologie Université de Franche-Comté Pôle Universitaire BP 71427 25211 Montbéliard Cedex France b Current address Université Henri Poincaré - UMR 1137 INRA UHP Écologie et Écophysiologie forestières BP 239 54506 Vandreuvre-les-Nancy Cedex France c UMR INRA UHP Écologie et Écophysiologie Forestières Centre INRA de Nancy 54280 Champenoux France Received 3 March 2003 accepted 29 September 2003 Abstract - Soil respiration was measured for six years from June 1996 to December 2001 in order to investigate both seasonal and interannual variations in a young beech forest in North Eastern France Hesse forest . Soil respiration exhibited pronounced seasonal variations that clearly followed the seasonal changes in soil temperature T and soil water content W . An exponential function y AWeBT fitted the data well and including a linear effect of soil water content on soil respiration strongly improved the predictive capacity of the model. However the increase in residuals when plotted against the date of measurements clearly evidenced that changes in soil temperature or soil water content failed to predict the increase in soil respiration with time highlighting that the interannual variation in soil respiration was not solely due to direct climate effects. When fitted against single year data the temperature sensitivity coefficient B was very close for both years while the pre-exponential factor A for 1997 was half of those for 2001. The model was further run over the entire data set allowing A to vary from one year to another. There was a close agreement between predicted and observed soil respiration and A exhibited a linear trend with time with a high value for 1999 after thinning. carbon flux beech soil .

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