Effects of Species Diversity on the Aboveground Biomass of Acacia mangium in a Mixed-Species Forest Stand in Thach That, Hanoi
Main Article Content
Abstract
Mixed-species plantations are considered as a pathway to sustainable forest management due to potential gains in productivity and ecosystem services compared with monocultures. Evidence on the relationship between species diversity and biomass in tropical plantations - particularly for crops such as Acacia mangium (A. mangium) - remains limited. This study tests the hypothesis that aboveground biomass (AGB) of A. mangium increases with forest species diversity. Data were collected in a 1-ha Marteloscope plot in Thach That (Hanoi), comprising 916 trees from 14 species. AGB was estimated using species-specific allometric equations; species diversity was characterized using the Shannon, Simpson, Berger–Parker, and evenness indices. Regression analyses employed three model forms (additive, exponential, and multiplicative) and were evaluated with AIC, BIC, R², and MSE. The exponential model provided the best representation of the relationships among variables. Notably, the effects of species diversity on biomass were nonlinear and heterogeneous, depending on model specification, some diversity indices tended to show negative associations with individual-tree biomass. The study underscores the importance of model-form selection when analyzing the diversity–biomass relationships and suggests expanding the Marteloscope network and integrating remote-sensing data to enable upscaling and to support evidence-based management of mixed-species plantations.
Keywords:
Mixed plantation, Marteloscope, tree diversity, aboveground biomass, diversity–productivity relationship.
References
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[9] L. Zeller, J. Liang, H. Pretzsch, Tree Species Richness Enhances Stand Productivity While Stand Structure Can Have Opposite Effects, Based on Forest Inventory Data From Germany and the United States of America, Forest Ecosystems,
Vol. 5, 2018, pp. 4, https://doi.org/10.1186/s40663-017-0127-6.
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Vol. 184, 2003, pp. 55-64, https://doi.org/10.1016/S0378-1127(03)00148-8.
[13] J. Szwagrzyk, A. Gazda, Above-Ground Standing Biomass and Tree Species Diversity in Natural Stands of Central Europe, Journal of Vegetation Science, Vol. 18, 2007, pp. 555-562, https://doi.org/10.1111/j.1654-1103.2007.tb02569.x.
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[16] J. Chave, M. R. Méchain, A. Búrquez, E. Chidumayo, M. S. Colgan, W. B. C. Delitti et al., Improved Allometric Models to Estimate the Aboveground Biomass of Tropical Trees, Global Change Biology, Vol. 20, 2014, pp. 3177-3190, https://doi.org/10.1111/gcb.12629.
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pp. 42-45 (in Vietnamese).
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Vol. 50, 2016, pp. 48-53, https://doi.org/10.1016/j.anres.2015.08.001.
[20] N. D. Hung, L. T. Giang, D. N. Tu, P. T. Hung, P. T. Lam, N. T. Khanh, H. M. Thuy et al., Part B-2: Tree Allometric Equations in Evergreen Broadleaf and Bamboo Forests in the North East Region, Vietnam, Forest Inventory and Planning Institute, Hanoi, 2012.
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[23] C. E. Shannon, W. Weaver, R. E. Blahut, The Mathematical Theory of Communication, University of Illinois Press, Urbana, 1949,
pp. 117-379, https://doi.org/10.2307/3611062.
[24] W. H. Berger, F. L. Parker, Diversity of Planktonic Foraminifera in Deep-Sea Sediments, Science, Vol. 168, 1970, pp. 1345-1347, https://doi.org/10.1126/science.168.3937.1345.
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Vol. 20, 2011, pp. 170-80, https://doi.org/10.1111/j.1466-8238.2010.00592.x.
[30] F. J. Bongers, Reprint of: Functional–Structural Plant Models to Boost Understanding of Complementarity in Light Capture and Use in Mixed-Species Forests, Basic and Applied Ecology, Vol. 55, 2021, pp. 64-73, https://doi.org/10.1016/j.baae.2021.01.008.
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