Post-Logging Canopy Gap Dynamics and Forest Regeneration Assessed Using Airborne LiDAR Time Series in the Brazilian Amazon with Attribution to Gap Types and Origins

Remote Sensing, Journal Year: 2024, Volume and Issue: 16(13), P. 2319 - 2319

Published: June 25, 2024

Gaps are openings within tropical forest canopies created by natural or anthropogenic disturbances. Important aspects of gap dynamics that not well understood include how gaps close over time and their potential for contagiousness, indicating whether the presence may induce creation new gaps. This is especially important when we consider disturbances from selective logging activities in rainforests, which take away large trees high commercial value leave behind a full The goal this study was to quantify understand open rainforests using series airborne LiDAR data, attributing observed processes types origins. For purpose, Jamari National Forest located Brazilian Amazon chosen as area because unique availability multi-temporal small-footprint data covering period 2011–2017 with five acquisitions, alongside geolocation were felled activities. We found an increased likelihood opening closer pre-existing associated tree locations (<20 m distance) rather than farther them, suggesting small-scale caused logging, even at low intensity, cause legacy effect mortality six years after due contagiousness. Moreover, closed similar annual rates vertical lateral ingrowth (16.7% yr−1) about 90% original post-disturbance. Therefore, relative contribution growth closure consolidated time. highlight aboveground biomass carbon density logged forests can be overestimated if considering only top canopy height metrics fast neighboring trees, first two regeneration where 26% solely ingrowth, would translate biomass. Trees inside grew 2.2 times faster (1.5 surrounding non-gap (0.7 yr−1). Our brings insights into both importance origins analysis. it demonstrates capability effectively characterizing impacts degradation subsequent recovery.

Language: Английский

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UAV survey mapping of illegal deforestation in Madagascar

Plants People Planet, Journal Year: 2024, Volume and Issue: 6(6), P. 1413 - 1424

Published: Aug. 7, 2024

Societal Impact Statement Unmanned aerial vehicle (UAV) imagery highlights the extent of illegal deforestation in protected areas for biodiverse humid forest central Madagascar. The ultra‐high‐resolution (<10‐cm pixel) images enable creation detailed 3D base maps and provide means to quantify stand losses. To help communities safeguard their forests, local non‐governmental organisations can use UAV combination with weekly alerts facilitate an immediate on‐ground response that significantly restricts activity. Integrating mapping coarse‐resolution freely available satellite should have much wider applications Madagascar tropics community‐based conservation. Summary This study Ambohimahamasina shows small UAVs offer a pixel), rapid cost‐effective solution patterns not visible imagery. Calculating volume are valuable ways rapidly assess losses prioritise ground patrols. 3‐dimensional measurements above carbon estimates indicate how, future, these metrics could be used calculate payments conservation programs. By combining free imagery, effective alert system has been developed supports community initiatives protection natural resources. wealth data collected this provides insights into dynamics, management, potential measure value forest.

Language: Английский

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Global patterns and drivers of tropical aboveground carbon changes

Nature Climate Change, Journal Year: 2024, Volume and Issue: 14(10), P. 1064 - 1070

Published: Sept. 12, 2024

Language: Английский

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Assessing Forest Degradation Through Remote Sensing in the Brazilian Amazon: Implications and Perspectives for Sustainable Forest Management

Remote Sensing, Journal Year: 2024, Volume and Issue: 16(23), P. 4557 - 4557

Published: Dec. 5, 2024

Forest degradation and forest disturbance are distinct yet often conflated concepts, complicating their definition monitoring. involves interrupted succession a severe reduction in services over time, caused by factors like fires, illegal selective logging, edge effects. disturbance, on the other hand, refers to abrupt, localized events, natural or anthropogenic, such as legal tropical blowdowns, storms, without necessarily leading long-term degradation. Despite varying intensity scale of systematic studies distinguishing its types classes limited. This study reviews anthropogenic impacts forests Brazilian Amazon, analyzing 80 scientific articles using remote sensing techniques data. Most research focuses “arc deforestation,” characterized intense human activity, showcasing methodological advancements but also revealing gaps monitoring less-studied regions central western Amazon. The findings emphasize need for advanced tools differentiate types, particularly sustainable management (SFM) contexts. Expanding underrepresented refining methodologies crucial better understanding dynamics improving conservation strategies. These efforts essential support effective informed policy development across

Language: Английский

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Signature of logging in the Brazilian Amazon still detected after 17 years

Forest Ecology and Management, Journal Year: 2024, Volume and Issue: 561, P. 121850 - 121850

Published: April 15, 2024

Language: Английский

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