Large trees as key elements of carbon storage and dynamics after selective logging in the Eastern Amazon

• Published in: Forest ecology and management Vol. 318; pp. 103 - 109
• Main Authors: Sist, Plinio, Mazzei, Lucas, Blanc, Lilian, Rutishauser, Ervan
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15.04.2014; Elsevier
• Subjects: Amazonia; Amazonian rainforest management; Animal and plant ecology; Animal, plant and microbial ecology; Biological and medical sciences; biomass; Biomass dynamics; Brazil; carbon; carbon dioxide; carbon markets; carbon sequestration; carbon sinks; cutting; Forest harvesting and working in forest; Forest management; Forest management. Stand types and stand dynamics. Silvicultural treatments. Tending of stands. Natural regeneration; Forestry; Fundamental and applied biological sciences. Psychology; greenhouse gas emissions; Improved forest management; logging; long term effects; mortality; prices; profits and margins; rain forests; REDD; Reduced-impact logging; Stand types and stand dynamics. Silvicultural treatments. Tending of stands. Natural regeneration; stems; sustainable forestry; Synecology; Terrestrial ecosystems; trees; Tropical silviculture; South America; America; Amazon Basin; Brazil; Amazonia; Amazonian rainforest management; Improved forest management; Reduced-impact logging; Biomass dynamics; REDD; Tropical silviculture; Silviculture; Rain forest; Tropical zone; Immobilization; Forest management; Biomass; Greenhouse gas; Deforestation; Drainage basins; Forest ecology; Tropical rain forest; Tropical forest; Forest logging; Carbon; Sustainable use; Environment impact; Forestry; Selective cutting; Environmental protection
• ISSN: 0378-1127; 1872-7042
• DOI: 10.1016/j.foreco.2014.01.005

•We monitored above-ground tree (AGB) biomass of 18–1ha plots after logging in Eastern Amazon for 8years.•The mortality of large trees (DBH>60cm), was found to drive the annual ABG net changes.•The over mortality of large trees injured by logging were the main causes of biomass loss.•To improve the AGB balance after selective logging, we recommend the preservation of the biggest trees (DBH>110cm).•REDD+payment could be used to compensate the lost of benefits, and to promote sustainable logging. The long term effect of Reduced-Impact Logging (RIL) on above-ground live biomass (AGB) dynamics was investigated in 18 1-ha logged over permanent sample plots set up in a terra firme rain forest in the Eastern Amazon (Brazil, Paragominas). Both tree survival and growth were investigated among three Diameter at Breath Height (DBH) classes (20–40, 40–60, ⩾60cm) to assess the contribution of each DBH class to the post-logging AGB recovery. Before logging, mean tree density and AGB per plot (dbh⩾20cm) were 187±14 trees ha−1 and 377.6±62.8Mgha−1 respectively. Although big trees (dbh⩾60cm) only represented 9.3% of the total tree density, they gathered almost half of total AGB. During the post-logging period (8years), the mortality of large trees was found to drive the annual net changes and largely overcame the AGB gain in the smaller DBH classes. Indeed, plots with high post-logging mortality of large trees showed negative carbon balance t over the study period (8years). The over mortality of large trees injured by logging contributed significantly to the annual AGB losses (up to 40%) in the first years after logging. Due to the overwhelming importance of this size class in carbon stocks and dynamic, reducing logging damages and intensity might have great impact in the post-logging biomass dynamics. We estimated that reducing logging intensity from 6 to 3 stems ha−1 would save 27.7Mg C ha−1 for a 35years rotation cycle. To compensate this loss of profits, compensatory payments of avoided CO2 emission should worth US $ 6.5/Mg of CO2. This price falls into the range of prices of the international carbon market. Sustainable forest management aiming at enhancing carbon stocks could therefore promote the preservation of the large trees. At our study site, we recommend the adoption of a maximum diameter cutting limit of 110cm.