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Effect of Tree Diversity on Soil Organic Carbon Content in the Homegarden Agroforestry System of North-Eastern Bangladesh

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Abstract

Tropical agroforestry systems have immense potential to sequester carbon both in aboveground and belowground biomass and soil. Homegarden agroforestry is a popular land-use system in the tropics, sequestrating more organic carbon in soil than crops, monoculture plantations and even than other agroforestry systems. Tree diversity and density are reported to affect soil organic carbon content in many of tropical agroforestry systems. Little evidence, however, exists for tropical homegardens. The present study has been conducted to investigate soil organic carbon content in relation to tree species diversity in the homegarden agroforestry system of north-eastern Bangladesh, to test the hypothesis that homegardens with high species diversity contain more organic carbon in soil than those with low species diversity. A multistage random sample of homegardens was selected and observations made in sample plots of tree density, species richness, soil pH and soil organic carbon content. Soil samples were collected at two depths (0–25, 26–50 cm) from each plot. Soil organic carbon content was found to be positively correlated with both tree density (r = 0.93, p < 0.01) and species richness (r = 0.79, p < 0.01). Soil pH was not found to differ significantly across soil depth (p = 0.67), except that more organic carbon content was found in the deeper soil layer than the upper layer (p < 0.05). The study demonstrates that species-rich homegarden with high tree density can sequester more carbon in soil than species-poor homegardens and thereby contribute more to climate change mitigation.

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Notes

  1. A blank experiment is a control treatment without any soil sample and used as a reference point.

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Acknowledgments

The authors sincerely acknowledge the co-operation of the homegardeners (the farmers) who wholeheartedly assisted during the field work of the study. We thank The Soil Resource Development Institution (SRDI), Sylhet, Bangladesh for providing the laboratory facilities for soil analysis. We also thank Steve Harrison (SSFO editor) and two anonymous reviewers for their suggestions to improve earlier versions of this manuscript.

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Authors and Affiliations

  1. Department of Forestry and Environmental Sciences, Shahjalal University of Science and Technology, Sylhet, 3114, Bangladesh

    Mahmuda Islam, Anna Dey & Mizanur Rahman

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  1. Mahmuda Islam
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  2. Anna Dey
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  3. Mizanur Rahman
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Correspondence to Mizanur Rahman.

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Islam, M., Dey, A. & Rahman, M. Effect of Tree Diversity on Soil Organic Carbon Content in the Homegarden Agroforestry System of North-Eastern Bangladesh. Small-scale Forestry 14, 91–101 (2015). https://doi.org/10.1007/s11842-014-9275-5

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