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Leaf litter decomposition of dominant tree species of Namdapha National Park, Arunachal Pradesh, northeast India

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Journal of Forest Research

Abstract

Rates of weight loss and nutrient (N and P) release patterns were studied in the leaf litter of the dominant tree species (Ailanthus grandis, Altingia excelsa, Castanopsis indica, Duabanga sonneriatioides, Dysoxylum binectariferum, Mesua ferrea, Shorea assamica, Taluma hodgsonii, Terminalia myriocarpa and Vatica lancefolia) of a tropical wet evergreen forest of northeast India. Nitrogen and phosphorus mineralization rate and decay pattern varied significantly from species to species. In general, the decay pattern, characterized by using a composite polynomial regression equation, exhibited three distinct phases of decay during litter decomposition—an initial slow decay phase (0.063% weight loss day−1), followed by a rapid decay phase (0.494% weight loss day−1) and a final slow decay phase (0.136% weight loss day−1). The initial chemical composition of the litter affected decomposition rates and patterns. Species like D. sonneriatoides, D. binectariferum, and T. hodgsonii with higher N and P content, lower carbon and lignin content, and lower C:N ratio and lignin:N ratio exhibited relatively faster decomposition rates than the other species, for example M. ferrea, C. indica and A. grandis. A slow decay rate was recorded for species such as M. ferrea, C. indica, and A. grandis. The initial N and P content of litter showed significant positive correlations with decay rates. Carbon and lignin content, lignin:N, and C:N showed significant negative correlations with decay rates. Soil total N and P, and rainfall, soil temperature, and soil moisture had positive correlations with decay rates. The rapid decomposition rates observed in comparison with other different forest litter decay rates confirm that tropical wet evergreen forest species are characterized by faster decomposition rates, indicating a faster rate of organic matter turnover and rapid nutrient cycling.

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Acknowledgments

The authors thank the Ministry of Environment and Forests, Government of India, for financial assistance. Special thanks are due to K. Haridasan for his ungrudging help in identification of plant species and to the Principal Chief Conservator of Forests, Arunachal Pradesh, for permitting us to work in the Namdapha National Park. Field and laboratory assistance by Shri J. Saikia and Shri M. Ingti is thankfully acknowledged. We thank the three anonymous reviewers for their valuable comments.

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Correspondence to Atiqur Rahman Barbhuiya.

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Barbhuiya, A.R., Arunachalam, A., Chandra Nath, P. et al. Leaf litter decomposition of dominant tree species of Namdapha National Park, Arunachal Pradesh, northeast India. J For Res 13, 25–34 (2008). https://doi.org/10.1007/s10310-007-0044-6

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  • DOI: https://doi.org/10.1007/s10310-007-0044-6

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