La gestion des sols est aujourd'hui de plus en plus reconnue comme �tant au cœur des probl�mes environnementaux actuels li�s au changement climatique et � la fertilit� des sols. � l'�chelle mondiale, les changements dans l'utilisation et la gestion des terres ont des effets consid�rables sur les propri�t�s physico-chimiques, microbiennes et agr�gatives des sols. Cela entra�ne d'une part une d�gradation de la qualit� des sols et, d'autre part, une augmentation du r�chauffement climatique et du changement climatique induits par le CO2. Il est donc n�cessaire de comprendre les r�servoirs de SOC dans les diff�rentes fractions physiques (c'est-�-dire les fractions granulom�triques, la biomasse microbienne, le carbone soluble dans l'eau) et chimiques (carbone labile et non labile) du sol, ainsi que les processus qui les influencent (tels que l'activit� microbienne du sol et la dynamique des agr�gats). Cela permettrait de mieux comprendre la dynamique temporelle des propri�t�s du sol dans les agro�cosyst�mes tropicaux arides. Cela rev�tirait une importance capitale pour l'att�nuation du changement climatique mondial, car ces �cosyst�mes poss�dent intrins�quement de solides m�canismes de conservation des nutriments et peuvent agir comme des puits de carbone potentiels (en raison de leur forte insaturation en carbone et de leur couverture terrestre de 41 %). Cet ouvrage passe donc en revue les changements temporels des propri�t�s du sol dans les syst�mes agricoles utilisant des engrais min�raux dans les agro�cosyst�mes tropicaux arides.

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