Spatial and seasonal variations in soil respiration in a temperate deciduous forest with fluctuating water table |
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| Authors: | Gaë lle Vincent,Eric Lucot,Daniel Epron |
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| Affiliation: | a Laboratoire de Biologie Environnementale, USC INRA 3184, Université de Franche-Comté, UFR des Sciences et Techniques, Place Leclerc, 25030 Besançon Cedex, France
b UMR INRA UHP “Ecologie et Ecophysiologie Forestières “, Université Henri Poincaré, Faculté des Sciences, BP 239, 54506 Vandoeuvre les Nancy Cedex, France |
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| Abstract: | Our objectives were to determine both spatial and temporal variations in soil respiration of a mixed deciduous forest, with soils exhibiting contrasting levels of hydromorphy. Soil respiration (RS) showed a clear seasonal trend that reflected those of soil temperature (TS) and soil water content (WS), especially during summer drought. Using a bivariate model (RMSE=1.03), both optimal soil water content for soil respiration (WSO) and soil respiration at both 10 °C and optimal soil water content (RS10) varied among plots, ranging, respectively, from 0.25 to 0.40 and from 2.30 to 3.60 μmol m−2 s−1. Spatial variation in WSO was related to bulk density and to topsoil N content, while spatial variation in RS10 was related to basal area and the difference in pH measured in water or KCl suspensions. These results offer promising perspectives for spatializing ecosystem carbon budget at the regional scale. |
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| Keywords: | Soil respiration Soil temperature Soil water content Forest soils Waterlogging Seasonal variations Spatial variability |
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