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

Yemadje Pierrot Lionel, Guibert Hervé, Blavet Didier, Olina Jean-Paul, Chevallier Tiphaine, Deleporte Philippe, Bernoux Martial. 2015. 24-h variation in soil respiration after a long dry season in a Sudano-Sahelian region. Scientia Agrícola, 72 (5) : 452-458.

https://doi.org/10.1590/0103-9016-2014-0412

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Quartile : Q2, Sujet : AGRICULTURE, MULTIDISCIPLINARY

Résumé : 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.

Mots-clés Agrovoc : matière organique du sol, saison sèche, respiration du sol, température du sol, teneur en eau du sol, méthodologie, cycle du carbone

Mots-clés géographiques Agrovoc : Sahel, Cameroun, Zone soudano-sahélienne

Classification Agris : P33 - Chimie et physique du sol
P40 - Météorologie et climatologie

Champ stratégique Cirad : Axe 6 (2014-2018) - Sociétés, natures et territoires

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