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- W2742007886 abstract "Abstract The sequestration of soil organic carbon (SOC) in agricultural systems has the potential to partially mitigate climate change by removing carbon dioxide (CO2) from the atmosphere. Furthermore, incorporating forage legumes into a grazing system may aid in C storage, as mature unfertilized pasture soils are typically nitrogen (N) limited. Leucaena leucocephala, a leguminous shrub, is often incorporated into grazing systems to provide a source of protein for cattle production. Additionally, leucaena improves the N fertility of grazing lands. Despite this, there is limited research on the C and N dynamics beneath leucaena-grass pastures, particularly at depth in the soil profile (1 m). We assessed the potential of leucaena to sequester SOC by estimating the origin (C3 or C4), quantity and vertical distribution of SOC stocks. A chronosequence of seasonally grazed leucaena stands (0, 9, 22, 34, 40 years) were sampled for organic C and natural δ13C abundance. Pasture type affected SOC stocks within the upper 0.2 m (grass C signature. Hence, SOC sequestration primarily occurred due to N accretion by leucaena (36 kg N ha−1 year−1) contributing to the increased C4 grass productivity, humus formation and slowed SOC decomposition. Therefore, there is a need to maintain soil fertility in grazed pastures to ensure SOC stocks are accreted and conserved." @default.
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- W2742007886 date "2017-10-01" @default.
- W2742007886 modified "2023-10-16" @default.
- W2742007886 title "The sequestration and turnover of soil organic carbon in subtropical leucaena-grass pastures" @default.
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- W2742007886 doi "https://doi.org/10.1016/j.agee.2017.07.020" @default.
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