Abstract
The extent of carbon (C) sequestration in soils under agroforestry systems in relation to soil types (fraction sizes) and vegetation structure remains largely unexplored. This study examined soil C storage, an indicator of C sequestration potential, in homegardens (HGs), natural forest, and single-species stands of coconut (Cocos nucifera), rice (Oryza sativa)-paddy, and rubber (Hevea brasiliensis), in Thrissur district, Kerala, India. Soil samples collected from four depth zones up to 1 m were fractionated to three size classes (250 – 2000 µm, 53 – 250 µm, < 53 µm) and their total C content determined. Total C stock (Mg ha−1) was highest in forests (176.6), followed by managed tree-based systems, and lowest in rice-paddy field (55.6). The results show storage of higher amounts of C in the < 53 µm fraction, the most stable form of C in soil, up to one- meter depth, in land-use systems with high stand density of trees such as forests and small-sized HG. Although the results do not allow comparison of changes in soil C stock in different land-use systems, they show higher C storage in soils under tree-based land-use systems compared with the treeless (rice-paddy) system, especially in lower soil depths, suggesting the higher soil C sequestration potential of tree-based systems, and thereby their role in reducing atmospheric concentration of carbon dioxide.
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Abbreviations
- AFS:
-
Agroforestry systems
- CSP:
-
Carbon sequestration potential
- GHG:
-
Greenhouse gas
- HG:
-
Homegarden
- HGL:
-
Large homegarden
- HGS:
-
Small homegarden
- SOC:
-
Soil organic carbon
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Saha, S.K., Ramachandran Nair, P.K., Nair, V.D. et al. Carbon storage in relation to soil size-fractions under tropical tree-based land-use systems. Plant Soil 328, 433–446 (2010). https://doi.org/10.1007/s11104-009-0123-x
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DOI: https://doi.org/10.1007/s11104-009-0123-x