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Remote Sens. 2016, 8(10), 839; doi:10.3390/rs8100839

Post-Fire Changes in Forest Biomass Retrieved by Airborne LiDAR in Amazonia

1
Remote Sensing Division, National Institute for Space Research, Avenida dos Astronautas 1758, São José dos Campos 12227-010, São Paulo, Brazil
2
Department of Science and Aerospace Technology, Trevo Coronel Aviador José Alberto Albano do Amarante, São José dos Campos 12228-001, São Paulo, Brazil
3
USDA Forest Service, International Institute of Tropical Forestry, 1201 Calle Ceiba Jardín Botánico Sur, Rio Piedra, PR 00926, USA;mkeller.co2@gmail.com
4
Embrapa Informática Agropecuária, Avenida Doutor André Tosello, 209-Cidade Universitária, Campinas 13083-886, São Paulo, Brazil
5
Woods Hole Research Center and Universidade Federal do Acre (UFAC), Parque Zoobotanico, Rio Branco 69915-900, Acre, Brazil
6
College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4SB, Devon, UK
*
Authors to whom correspondence should be addressed.
Academic Editors: Diofantos Hadjimitsis, Ioannis Gitas, Luigi Boschetti, Kyriacos Themistocleous, Randolph H. Wynne and Prasad S. Thenkabail
Received: 6 July 2016 / Revised: 9 September 2016 / Accepted: 27 September 2016 / Published: 20 October 2016
View Full-Text   |   Download PDF [9179 KB, uploaded 20 October 2016]   |  

Abstract

Fire is one of the main factors directly impacting Amazonian forest biomass and dynamics. Because of Amazonia’s large geographical extent, remote sensing techniques are required for comprehensively assessing forest fire impacts at the landscape level. In this context, Light Detection and Ranging (LiDAR) stands out as a technology capable of retrieving direct measurements of vegetation vertical arrangement, which can be directly associated with aboveground biomass. This work aims, for the first time, to quantify post-fire changes in forest canopy height and biomass using airborne LiDAR in western Amazonia. For this, the present study evaluated four areas located in the state of Acre, called Rio Branco, Humaitá, Bonal and Talismã. Rio Branco and Humaitá burned in 2005 and Bonal and Talismã burned in 2010. In these areas, we inventoried a total of 25 plots (0.25 ha each) in 2014. Humaitá and Talismã are located in an open forest with bamboo and Bonal and Rio Branco are located in a dense forest. Our results showed that even ten years after the fire event, there was no complete recovery of the height and biomass of the burned areas (p < 0.05). The percentage difference in height between control and burned sites was 2.23% for Rio Branco, 9.26% for Humaitá, 10.03% for Talismã and 20.25% for Bonal. All burned sites had significantly lower biomass values than control sites. In Rio Branco (ten years after fire), Humaitá (nine years after fire), Bonal (four years after fire) and Talismã (five years after fire) biomass was 6.71%, 13.66%, 17.89% and 22.69% lower than control sites, respectively. The total amount of biomass lost for the studied sites was 16,706.3 Mg, with an average loss of 4176.6 Mg for sites burned in 2005 and 2890 Mg for sites burned in 2010, with an average loss of 3615 Mg. Fire impact associated with tree mortality was clearly detected using LiDAR data up to ten years after the fire event. This study indicates that fire disturbance in the Amazon region can cause persistent above-ground biomass loss and subsequent reduction of forest carbon stocks. Continuous monitoring of burned forests is required for depicting the long-term recovery trajectory of fire-affected Amazonian forests. View Full-Text
Keywords: light detection and ranging; Amazon; aboveground biomass; tropical forest; fire; LiDAR; degradation light detection and ranging; Amazon; aboveground biomass; tropical forest; fire; LiDAR; degradation
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MDPI and ACS Style

Sato, L.Y.; Gomes, V.C.F.; Shimabukuro, Y.E.; Keller, M.; Arai, E.; dos-Santos, M.N.; Brown, I.F.; Aragão, L.E.O.C. Post-Fire Changes in Forest Biomass Retrieved by Airborne LiDAR in Amazonia. Remote Sens. 2016, 8, 839.

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