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Tree Diversity and Ecosystem Carbon Stock Assessment in Nambor Wildlife Sanctuary, Assam

Abstract

A study was carried out to assess tree diversity, forest carbon stock and carbon dioxide (CO2) sequestration in Nambor tropical semi-evergreen forest. A total of 53 tree species from 47 genera and 32 families were recorded in the forest. Vatica lanceifolia was the dominant tree species with maximum 33.78 importance value index (IVI), 0.30 Shannon diversity index (H′) and 0.03 Simpson’s index (D) followed by Lagerstroemia reginae (20.75 IVI, 0.18 H′ and 0.004 D), Dysoxylum excelsum (17.70 IVI, 0.20 H′ and 0.006 D), Sterculia villosa (14.15 IVI, 0.09 H′ and 0.0007 D) and Toona ciliata (11.60 IVI, 0.07 H′ and 0.0004 D) as codominant species. Among the forest carbon pools, maximum 50.32% carbon was stored in soil followed by 39.42% in above ground biomass and 10.21, 0.03 and 0.02% in below ground, leaf litter and dead debris pools, respectively. Total ecosystem carbon stock in Nambor forest was estimated to be 244.78 Mg ha−1. The estimated carbon stock was extrapolated over 3700 hectare area and found to be 905186.50 Mg. The total forest carbon stock was also converted into CO2 equivalents and estimated as 3,322,034.46 Mg. The study observed that forest ecosystem offsets significant amount of atmospheric CO2; therefore, conservation and management of forest resources are imperative to combat global climate change.

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Acknowledgements

This study was funded by the Indian Council of Forestry Research and Education, Dehradun, under National Forestry Research Programme, Grant number No. RFRI/2013-14/SCD-08. The authors are thankful to the Department of Environment and Forests, Govt. of Assam, for granting permission to carry out the research work. All the necessary facilities provided by the Director, Rain Forest Research Institute, Jorhat, Assam, are gratefully acknowledged. The authors are also grateful to anonymous reviewer for providing valuable suggestions to improve the overall quality and readability of the manuscript.

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Correspondence to Krishna Giri.

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The authors declare no conflict of interest to publish this manuscript.

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Significance Statement

Forest carbon stock estimation studies have been carried out across the country and in most of the reports only above ground tree biomass and soil carbon stock is accounted. In the present study all the five carbon pools were studied to assess the carbon stock of Nambor forest ecosystem.

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Giri, K., Buragohain, P., Konwar, S. et al. Tree Diversity and Ecosystem Carbon Stock Assessment in Nambor Wildlife Sanctuary, Assam. Proc. Natl. Acad. Sci., India, Sect. B Biol. Sci. 89, 1421–1428 (2019). https://doi.org/10.1007/s40011-018-01072-8

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Keywords

  • Nambor Wildlife Sanctuary
  • Forest carbon pools
  • CO2 offsetting
  • Climate change mitigation