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Biotic and abiotic drivers of stemflow carbon enrichment ratio in tropical trees

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Abstract

Key message

Tree bark structure and crown area, are the main biotic drivers, and maximum rainfall intensity and seasonality are the main abiotic drivers of carbon input via stemflow in a neotropical forest.

Abstract

Stemflow is an often-neglected concentrated water path in the forest, transports nutrients from the canopy along the main tree stem, through to the forest floor, thereby affecting the biogeochemical processes, and accelerating the nutrients redistribution in forest ecosystems. Here we assessed what are the effects of tree structural features (height, bark roughness, projected crown area), seasonality (wet and dry season, and previous dry period), and maximum rainfall intensity on stemflow total carbon enrichment ratios in a semi-deciduous tropical forest. The enrichment ratio allows quantifying the contribution of stemflow to delivery carbon to the forest soil. To evaluate the increase in total carbon concentration in the stemflow, we sampled and analyzed 61 rainfall events (gross rainfall, throughfall, and stemflow) and modeled the enrichment ratios using potential biotic and abiotic drivers through generalized linear models. The stemflow carbon enrichment ratios ranged from 1 to 30 relative to gross rainfall and from 0.8 to 11 relative to throughfall, which demonstrates the importance of forests on carbon cycle and to provide ecosystem services. The carbon concentration in stemflow was higher in the dry season; however, the greater rainfall amount in the wet season provided higher carbon inputs. Moreover, the carbon enrichment ratios were sensitive to variation on tree structural features and meteorological conditions, highlighting bark structure, crown area, maximum rainfall intensity, and season. Our findings demonstrate the role of the stemflow as a relevant source of total carbon input into tropical forests soils.

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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

We acknowledge the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—CAPES (for the Ph.D research grant for the first author, and Grant number 88882.306661/2018-01); the Conselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq (Grant number 401760/2016-2); and FAPEMIG (Grant number PPMX-545/18) for supporting and funding this work. Special thanks go to “Laboratório de Gestão de Resíduos Químicos da Universidade Federal de Lavras (LGRQ-UFLA)” for the facilities and equipment used in this study.

Funding

This work was financially supported by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—CAPES (Grant number 88882.306661/2018-01); the Conselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq (Grant number 401760/2016-2); and FAPEMIG (Grant number PPMX-545/18).

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Authors

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Conceived and designed the study: VAM, MdCNST and CRdM. Led the research project: CRdM. Performed the experiments, collected data and samples in the field: VAM and AFR. Processed samples in the lab: VAM. Wrote the paper: VAM, MdCNST, and NGC. Critical revision: CRdM, AFR, and JMdM. Statistical support: MdCNST. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Vanessa Alves Mantovani.

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The authors declare that they have no conflict of interest.

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Communicated by T. Gimeno.

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Mantovani, V.A., Terra, M.d.N.S., Rodrigues, A.F. et al. Biotic and abiotic drivers of stemflow carbon enrichment ratio in tropical trees. Trees 37, 467–483 (2023). https://doi.org/10.1007/s00468-022-02363-4

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  • DOI: https://doi.org/10.1007/s00468-022-02363-4

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