Stock de carbone organique dans des sols de la région aride de Coquimbo (Chili): conséquences de l'intensité des pâturages sur les parcours caprins

Soto-Mundaca, G.; Bruand, A.; Disnar, J-R.; Gallaud, A.

Keywords: Sols, Chili, parcours, matière organique, prédiction des stocks, zone aride


The stocks of soil organic carbon were studied under moderate (6 SRU ha-1year-1) and intensive goat grazing (10 SRUha-1year-1) and compared with the stock present under native vegetation in the experimental station of Las Cardas (Coquimbo region, Chile). Results show that under moderate goat grazing (6 SRU ha-1year-1), the organic carbon stock to 1m of depth would not be affected with 24.3 to 29.3 Mgha-1 compared to 31.1 to 42.6 Mgha-1 under native vegetation. These stocks are not significantly different (P=0.95) and the differences can be attributed to the variability between replications. On the other hand, under intense goat grazing, the organic carbon stock was only 10.2 to 15.5 Mgha-1. Finally, our results show that it is possible to predict the stock of soil organic carbon by using the stock of soil organic carbon within the 0-30cm top layer alone (R2=0.89) with a bias of <0.1 Mgha-1 and a precision of 3.6 Mgha-1.

Más información

Título de la Revista: Sciences et Changements Planétaires
Volumen: 22
Número: 4
Editorial: John Libbey Eurotext
Fecha de publicación: 2011
Página de inicio: 233
Página final: 243
Idioma: French