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Carbon Dynamics in a Human-Modified Tropical Forest: A Case Study Using Multi-Temporal LiDAR Data

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journal contribution
posted on 22.05.2020, 11:35 by Yhasmin Mendes de Moura, Heiko Balzter, Lênio S Galvão, Ricardo Dalagnol, Fernando Espírito-Santo, Erone G Santos, Mariano Garcia, Polyanna da Conceição Bispo, Raimundo C Oliveira, Yosio E Shimabukuro
Tropical forests hold significant amounts of carbon and play a critical role on Earth´s climate system. To date, carbon dynamics over tropical forests have been poorly assessed, especially over vast areas of the tropics that have been affected by some type of disturbance (e.g., selective logging, understory fires, and fragmentation). Understanding the multi-temporal dynamics of carbon stocks over human-modified tropical forests (HMTF) is crucial to close the carbon cycle balance in the tropics. Here, we used multi-temporal and high-spatial resolution airborne LiDAR data to quantify rates of carbon dynamics over a large patch of HMTF in eastern Amazon, Brazil. We described a robust approach to monitor changes in aboveground forest carbon stocks between 2012 and 2018. Our results showed that this particular HMTF lost 0.57 m·yr−1 in mean forest canopy height and 1.38 Mg·C·ha−1·yr−1 of forest carbon between 2012 and 2018. LiDAR-based estimates of Aboveground Carbon Density (ACD) showed progressive loss through the years, from 77.9 Mg·C·ha−1 in 2012 to 53.1 Mg·C·ha−1 in 2018, thus a decrease of 31.8%. Rates of carbon stock changes were negative for all time intervals analyzed, yielding average annual carbon loss rates of −1.34 Mg·C·ha−1·yr−1. This suggests that this HMTF is acting more as a source of carbon than a sink, having great negative implications for carbon emission scenarios in tropical forests. Although more studies of forest dynamics in HMTFs are necessary to reduce the current remaining uncertainties in the carbon cycle, our results highlight the persistent effects of carbon losses for the study area. HMTFs are likely to expand across the Amazon in the near future. The resultant carbon source conditions, directly associated with disturbances, may be essential when considering climate projections and carbon accounting methods.

Funding

This research was funded by the Royal Society, Newton International Fellowship (Y.M.d.M.), grant number NF170036. H.B. was supported by the UK Natural Environment Research Council through the National Centre for Earth Observation. R.D. was supported by The Sao Paulo Research Foundation (FAPESP), grant number 2015/22987-7. P.d.C.B. was supported by European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement no 660020.

History

Citation

Remote Sens. 2020, 12, 430

Published in

Remote Sensing

Volume

12

Issue

3

Pagination

430 - 430

Publisher

MDPI AG

eissn

2072-4292

Acceptance date

21/01/2020

Copyright date

2020

Available date

29/01/2020

Language

en