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- Title
48-year effect on organic carbon and nitrogen stocks in two soil types in northwestern Tunisia.
- Authors
Tlili, Ahlem; Dridi, Imene; Saia, Sergio; Schillaci, Calogero
- Abstract
Information on spatial and temporal changes in the soil organic carbon (SOC) and soil total nitrogen (STN) stocks are crucial to support sustainable land management strategies. However, such information is scarce mainly for arid and semi-arid regions. The present research aimed to determine SOC and STN stock dynamics with depths during the 1971–2019 period. Thus, two soil types were selected in north Tunisia: a Luvisol under forest vegetation and a Cambisol under cereal crop and analyzed for SOC, STN, rock fraction, and bulk density from the surface (0–30 cm), middle (30–50 cm), and deep layers (50–100 cm) in 1971, 2005, 2012, and 2019. SOC and STN contents decreased with depth in both soils. The Luvisol exhibited the highest SOC and STN contents. From 1971 to 2019, SOC and STN contents decreased more in the surface layer in both soils with sharpest decrease for STN than SOC. The stocks were calculated taking into account the rock fractions avoiding overestimation. Stocks recorded in the surface layer corresponded to 68% of total SOC stock and 58% of total STN stock in both soils. From 1971 to 2019, the reduction of SOC and STN stocks was more important in the Cambisol than in the Luvisol in all layers, mainly in the surface layer. Such reductions could have important implications for soil fertility and global warming.
- Publication
Arabian Journal of Geosciences, 2022, Vol 15, Issue 7, p1
- ISSN
1866-7511
- Publication type
Article
- DOI
10.1007/s12517-022-09860-3