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Technische Universitat Munchen (2009)

Soils of a semiarid shortgrass steppe in Inner Mongolia : Organic matter composition and distribution as affected by sheep grazing

Steffens, Markus

Titre : Soils of a semiarid shortgrass steppe in Inner Mongolia : Organic matter composition and distribution as affected by sheep grazing

Auteur : Steffens, Markus

Université de soutenance : Technische Universitat Munchen

Grade : Doktorgrade 2009

Résumé
Intensive grazing in the grasslands of northern China results in a loss of soil organic matter (SOM), reduced aggregate stability and a higher abundance of dust storms. It is assumed that an improved grazing management can mitigate these detrimental effects and enhance the carbon sequestration of the steppe soils. This study showed that (1) soil chemical and physical topsoil properties significantly recovered after longterm grazing cessation (>5 years) ; (2) recovering vegetation and deposition of windblown material initiated the recovery of grazing-degraded areas ; (3) aggregate stability and formation in topsoils was increased after grazing cessation ; and (4) additional SOM inputs were sequestered in readily decomposable fractions and not stabilised in the long-term.

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Page publiée le 31 août 2010, mise à jour le 10 janvier 2019