Soil organic carbon in northern Spain (Galicia, Asturias, Cantabria and País Vasco)

  1. Rosa Calvo de Anta 1
  2. Elías Luis Calvo 1
  3. Francisco Casás Sabarís 1
  4. Juan Manuel Galiñanes Costa 1
  5. Natividad Matilla Mosquera 1
  6. Felipe Macías Vázquez 1
  7. Marta Camps Arbestain 1
  8. Noemí Vázquez Garcí 1
  1. 1 Universidade de Santiago de Compostela

    Universidade de Santiago de Compostela

    Santiago de Compostela, España


Spanish Journal of Soil Science: SJSS

ISSN: 2253-6574

Year of publication: 2015

Volume: 5

Issue: 1

Pages: 41-53

Type: Article

DOI: 10.3232/SJSS.2015.V5.N1.04 DIALNET GOOGLE SCHOLAR lock_openOpen access editor

More publications in: Spanish Journal of Soil Science: SJSS

Sustainable development goals


The soil organic carbon content was analyzed in more than 7,000 soil samples under different land uses, climates and lithologies from northern Spain (Galicia, Asturias, Cantábria y País Vasco). GIS maps (1:50 000) were made of the % SOC and SOC stocks. The % SOC varies according to land use (higher in forest and scrub soils and lower in agricultural soils) and climate, and there is a highly significant correlation between SOC content and mean annual precipitation. There are significant differences between the soils of Galicia/Western Asturias (GAw) and those of the rest of the study area (Central and Eastern Asturias, Cantabria and País Vasco) (AceCV), although these are neighbouring regions. In forest and/or scrub soils with a udic soil moisture regime, in GAw, the SOC is usually > 7% and the average stocks 260 t ha-1 (0-30 cm), and >340 t ha-1 (0-50 cm) in soils with thick organic matter rich horizons (> 40 cm); these values greatly exceed the average contents observed in forest soils from temperate zones. Under similar conditions of vegetation and climate in soils of AceCV the SOC average is 3% and the mean stocks 90-100 t ha-1 (0-30 cm). The andic character of acid forest soils in GAw and the formation of C-Al,Fe complexes are pointed out as the SOC stabilization mechanism, in contrast to the neutral and calcareous soils that predominate in AceCV, where the main species of OC are easily biodegradable.