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| Pàgina inicial > Articles > Articles publicats > Interactions between biogeochemical and management factors explain soil organic carbon in Pyrenean grasslands |
(Forest Sciences Centre of Catalonia . Laboratory of Functional Ecology and Global Change) (Universidad Pública de Navarra. Grupo Ecología y Medio Ambiente and ISFood Institute) (Universitat Autònoma de Barcelona. Grup de Recerca en Remugants (G2R)) (Universitat Autònoma de Barcelona. Grup de Recerca en Remugants (G2R)) (Forest Sciences Centre of Catalonia . Laboratory of Functional Ecology and Global Change) (Universidad Pública de Navarra. Departamento de Agronomía, Biotecnología y Alimentación) (Centre de Recerca Ecològica i d'Aplicacions Forestals) (ARAID/IPE-CSIC)| Data: | 2020 |
| Resum: | Grasslands are one of the major sinks of terrestrial soil organic carbon (SOC). Understanding how environmental and management factors drive SOC is challenging because they are scale-dependent, with large-scale drivers affecting SOC both directly and through drivers working at small scales. Here we addressed how regional, landscape and grazing management, soil properties and nutrients, and herbage quality factors affect 20 cm depth SOC stocks in mountain grasslands in the Pyrenees. Taking advantage of the high variety of environmental heterogeneity in the Pyrenees, we built a dataset (n = 128) that comprises a wide range of environmental and management conditions. This was used to understand the relationship between SOC stocks and their drivers considering multiple environments. We found that temperature seasonality (difference between mean summer temperature and mean annual temperature; TSIS) was the most important geophysical driver of SOC in our study, depending on topography and management. TSIS effects on SOC increased in exposed hillsides, slopy areas, and relatively intensively grazed grasslands. Increased TSIS probably favours plant biomass production, particularly at high altitudes, but landscape and grazing management factors regulate the accumulation of this biomass into SOC. Concerning biochemical SOC drivers, we found unexpected interactive effects between grazer type, soil nutrients and herbage quality. Soil N was a crucial SOC driver as expected but modulated by livestock species and neutral detergent fibre contenting plant biomass; herbage recalcitrance effects varied depending on grazer species. These results highlight the gaps in knowledge about SOC drivers in grasslands under different environmental and management conditions. They may also serve to generate testable hypotheses in later/future studies directed to climate change mitigation policies. |
| Ajuts: | Ministerio de Ciencia e Innovación CGL2006-13555-C03-03 Ministerio de Ciencia e Innovación CGL2010- 22378-C03-01 Ministerio de Ciencia e Innovación REN2002-04300-C02-01 Ministerio de Economía y Competitividad CGL2017-85490-R Ministerio de Economía y Competitividad GL2013-49142-C2-1-R |
| Drets: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.  |
| Llengua: | Anglès |
| Document: | Article ; recerca ; Versió publicada |
| Publicat a: | Biogeosciences, Vol. 17 Núm. 23 (march 2020) , p. 6033-6050, ISSN 1726-4189 |
