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24-h variation in soil respiration after a long dry season in a Sudano-Sahelian region

Yemadje P.L., Guibert H., Blavet D., Olina J.P., Chevallier T., Deleporte P., Bernoux M.. 2015. Scientia Agrícola, 72 (5) : p. 452-458.

Soil respiration is a major component of the global carbon cycle which links ecosystems and the atmosphere. To evaluate the reaction of soil respiration after wetting, during a dry period, soil respiration and associated environmental factors were measured over a 24-h period, during the dry season in North Cameroon after wetting the soil. Over 24-h, soil respiration rates followed a quadratic curve during the day coming close to linear at night, while soil temperature and moisture together explained at least 73 % of the variations during the 24-h observed. These soil respiration rates increased during the morning, peaked between 11h00 and 13h00 and then decreased gradually to the minimum around 06h00. These observations were used to propose a method for estimating mean daytime and nighttime soil respiration after wetting the soil. The method proposed in this study has the advantage of being based on a small number of measurements and is, therefore, easier to implement for monitoring 24-h soil respiration after the first rains following a long dry period. (Résumé d'auteur)

Mots-clés : cycle du carbone; méthodologie; teneur en eau du sol; température du sol; respiration du sol; saison sèche; matière organique du sol; zone soudano-sahélienne; cameroun; sahel

Thématique : Chimie et physique du sol; Météorologie et climatologie

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