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Tropical forest canopies and their relationships with climate and disturbance: results from a global dataset of consistent field-based measurements

Lookup NU author(s): Professor Marion PfeiferORCiD

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

Abstract

© 2018, The Author(s). Background: Canopy structure, defined by leaf area index (LAI), fractional vegetation cover (FCover) and fraction of absorbed photosynthetically active radiation (fAPAR), regulates a wide range of forest functions and ecosystem services. Spatially consistent field-measurements of canopy structure are however lacking, particularly for the tropics. Methods: Here, we introduce the Global LAI database: a global dataset of field-based canopy structure measurements spanning tropical forests in four continents (Africa, Asia, Australia and the Americas). We use these measurements to test for climate dependencies within and across continents, and to test for the potential of anthropogenic disturbance and forest protection to modulate those dependences. Results: Using data collected from 887 tropical forest plots, we show that maximum water deficit, defined across the most arid months of the year, is an important predictor of canopy structure, with all three canopy attributes declining significantly with increasing water deficit. Canopy attributes also increase with minimum temperature, and with the protection of forests according to both active (within protected areas) and passive measures (through topography). Once protection and continent effects are accounted for, other anthropogenic measures (e.g. human population) do not improve the model. Conclusions: We conclude that canopy structure in the tropics is primarily a consequence of forest adaptation to the maximum water deficits historically experienced within a given region. Climate change, and in particular changes in drought regimes may thus affect forest structure and function, but forest protection may offer some resilience against this effect.

Publication metadata

Author(s): Pfeifer M, Gonsamo A, Woodgate W, Cayuela L, Marshall AR, Ledo A, Paine TCE, Marchant R, Burt A, Calders K, Courtney-Mustaphi C, Cuni-Sanchez A, Deere NJ, Denu D, de Tanago JG, Hayward R, Lau A, Macia MJ, Olivier PI, Pellikka P, Seki H, Shirima D, Trevithick R, Wedeux B, Wheeler C, Munishi PKT, Martin T, Mustari A, Platts PJ

Publication type: Article

Publication status: Published

Journal: Forest Ecosystems

Year: 2018

Volume: 5

Online publication date: 08/01/2018

Acceptance date: 10/12/2017

Date deposited: 06/08/2018

ISSN (print): 2095-6355

ISSN (electronic): 2197-5620

Publisher: SpringerOpen

URL: https://doi.org/10.1186/s40663-017-0118-7

DOI: 10.1186/s40663-017-0118-7

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