Interactions between biogeochemical and management factors explain soil organic carbon in Pyrenean grasslands
Canals, Rosa M.
Plaixats i Boixadera, Josefina
Albanell Trullas, Elena
San Emeterio, Leticia
Ribas Artola, Àngela
Jiménez, Juan José
MetadataShow full item record
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.
Is part ofBiogeosciences Discussions, 2020, vol. 17. núm. 23, p. 6033-6050
European research projects
Except where otherwise noted, this item's license is described as cc-by (c) Rodríguez, Antonio et al., 2020
Showing items related by title, author, creator and subject.
Factors regulating carbon mineralization in the surface and subsurface soils of Pyrenean mountain grasslands García-Pausas, Jordi; Casals, Pere; Camarero, Lluís; Huguet, Carme; Thompson, Roy; Sebastià, Ma. T.; Romanyà i Socoró, Joan (Elsevier, 2008)Although a large amount of soil carbon (C) is stored in subsurface soils, most studies on soil C dynamics focus on the upper layers. The aim of this study is to assess the factors that regulate C mineralization in mountain ...
Soil organic carbon storage in mountain grasslands of the Pyrenees: effects of climate and topography Garcia-Pausas, Jordi; Casals, Pere; Huguet, Carme; Sebastià, Ma. T.; Thompson, Roy; Romanyà i Socoró, Joan; Camarero, Lluís (Springer Verlag, 2007)The prediction of soil C stocks across the landscape has been increasingly studied in many areas of the world. Soil organic C storage in mountain areas is highly heterogeneous, mainly as a result of local-scale variability ...
Debouk, Haifa; San Emeterio, Leticia; Marí Marí, Teresa; Canals, Rosa M.; Sebastià, Ma. T. (MDPI, 2020-08-31)Global change modifies vegetation composition in grasslands with shifts in plant functional types (PFT). Although changes in plant community composition imply changes in soil function, this relationship is not well understood. ...