Recovery of Forest Structure Following Large-Scale Windthrows in the Northwestern Amazon
- Max Planck Society, Jena (Germany). Max Planck Inst. for Biogeochemistry; Friedrich Schiller Univ., Jena (Germany); National Univ. of the Peruvian Amazon, Iquitos (Peru)
- Max Planck Society, Jena (Germany). Max Planck Inst. for Biogeochemistry; Brazilian Inst. for Amazon Research, Manaus (Brazil). Forest Management Lab.
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- National Univ. of the Peruvian Amazon, Iquitos (Peru)
- Univ. of New South Wales, Sydney, NSW (Australia). ARC Centre of Excellence for Climate Extremes
- Univ. of Redlands, CA (United States)
- Friedrich Schiller Univ., Jena (Germany)
- Max Planck Society, Jena (Germany). Max Planck Inst. for Biogeochemistry
The dynamics of forest recovery after windthrows (i.e., broken or uprooted trees by wind) are poorly understood in tropical forests. The Northwestern Amazon (NWA) is characterized by a higher occurrence of windthrows, greater rainfall, and higher annual tree mortality rates (~2%) than the Central Amazon (CA). We combined forest inventory data from three sites in the Iquitos region of Peru, with recovery periods spanning 2, 12, and 22 years following windthrow events. Study sites and sampling areas were selected by assessing the windthrow severity using remote sensing. At each site, we recorded all trees with a diameter at breast height (DBH) ≥ 10 cm along transects, capturing the range of windthrow severity from old-growth to highly disturbed (mortality > 60%) forest. Across all damage classes, tree density and basal area recovered to >90% of the old-growth values after 20 years. Aboveground biomass (AGB) in old-growth forest was 380 (±156) Mg ha-1. In extremely disturbed areas, AGB was still reduced to 163 (±68) Mg ha-1 after 2 years and 323 (± 139) Mg ha-1 after 12 years. This recovery rate is ~50% faster than that reported for Central Amazon forests. The faster recovery of forest structure in our study region may be a function of its higher productivity and adaptability to more frequent and severe windthrows. These varying rates of recovery highlight the importance of extreme wind and rainfall on shaping gradients of forest structure in the Amazon, and the different vulnerabilities of these forests to natural disturbances whose severity and frequency are being altered by climate change.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- BMBF; National Aeronautic and Space Administration (NASA); USDOE Office of Science (SC), Biological and Environmental Research (BER)
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1813994
- Journal Information:
- Forests, Journal Name: Forests Journal Issue: 6 Vol. 12; ISSN 1999-4907
- Publisher:
- MDPICopyright Statement
- Country of Publication:
- United States
- Language:
- English
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