Soil inorganic carbon in Pampean agroecosystems: distribution and relationships with soil properties in Buenos Aires province
Gabriela Civeira
+ Author Affiliations
- Author Affiliations
Soil Institute INTA De Los Reseros y Las Cabañas s/n Castelar, CP 1712, Buenos Aires, Argentina. Email: civeira.gabriela@inta.gob.ar
Soil Research 54(7) 777-786 https://doi.org/10.1071/SR15167
Submitted: 13 June 2015 Accepted: 15 December 2015 Published: 15 August 2016
Abstract
Changes in contents of soil organic carbon and soil inorganic carbon (SOC and SIC, respectively) could have a great effect on the global carbon balance. Quantifying SIC at regional level is essential in climate change models. The spatial distribution of SIC depends on climate, soil particle size, soil type, landscape position and SOC fraction, among other factors. This study compared the SIC storage in soil profiles at different depths in different soil great groups and landscape positions in Buenos Aires province, Argentina. The objectives were to: (i) quantify SIC content and distribution in the soil profile (depths of 0–20, 20–100 and 0–100 cm) for different soil types and landscape positions; (ii) identify relationships between the distribution of SIC and edaphic properties; and (iii) analyse the relationship between SIC and SOC in soils of the area. The analysis was based on 150 soil profiles of Argiudolls, Hapludolls, Natraquolls and Haplustolls from Buenos Aires province. The data on SIC were expressed by soil great group, landscape position (summit, shoulder slope and toe slope) and depth in the soil profile (0–20, 20–100 and 0–100 cm). In the whole profile (0–100 cm) the order of decrease for SIC was Haplustolls > Hapludolls > Natraquolls > Argiudolls. Concentrations of SIC for landscape positions were shoulder slope > toe slope > summit. pH was positively correlated with SIC content within the 100-cm soil depth and in the AC horizon in Haplustolls (P < 0.05), and with SIC content in the C horizons in Hapludolls and Haplustolls. Silt was positively correlated with SIC in Haplustolls. There were changes in the contents of SIC due to increased SOC. Landscape position and great group determined the distribution of SIC in these Pampean agroecosystems. These results may be useful to predict SIC responses to land use change at local and regional levels.
Additional keywords: landscape position, SIC, soil great groups, soil horizons, soil organic carbon (SOC).
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