globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.foreco.2017.04.026
Scopus记录号: 2-s2.0-85018261145
论文题名:
Decomposition rates of coarse woody debris in undisturbed Amazonian seasonally flooded and unflooded forests in the Rio Negro-Rio Branco Basin in Roraima, Brazil
作者: Barbosa R.I.; de Castilho C.V.; de Oliveira Perdiz R.; Damasco G.; Rodrigues R.; Fearnside P.M.
刊名: Forest Ecology and Management
ISSN:  0378-1127
出版年: 2017
卷: 397
起始页码: 1
结束页码: 9
语种: 英语
英文关键词: Carbon flux ; Dead biomass ; Roraima ; Undisturbed forests ; Wood density ; Wood fragmentation
Scopus关键词: Debris ; Ecosystems ; Floods ; Hardwoods ; Wood ; Above ground biomass ; Carbon fluxes ; Coarse woody debris ; Observation Period ; Roraima ; Species composition ; Undisturbed forests ; Wood density ; Forestry
英文摘要: Estimates of carbon-stock changes in forest ecosystems require information on dead wood decomposition rates. In the Amazon, the lack of data is dramatic due to the small number of studies and the large range of forest types. The aim of this study was to estimate the decomposition rate of coarse woody debris (CWD) in two oligotrophic undisturbed forest formations of the northern Brazilian Amazon: seasonally flooded and unflooded. We analyzed 20 arboreal individuals (11 tree species and 3 palm species) with distinct wood-density categories. The mean annual decomposition rate of all samples independent of forest formation ranged from 0.044 to 0.963 yr−1, considering two observation periods (12 and 24 months). The highest rate (0.732 ± 0.206 [SD] yr−1) was observed for the lowest wood-density class of palms, whereas the lowest rate (0.119 ± 0.101 yr−1) was determined for trees with high wood density. In terms of forest formation, the rates values differ when weighted by the wood-density classes, indicating that unflooded forest (0.181 ± 0.083 [SE] yr−1; mean decay time 11–30 years) has a decomposition rate ∼19% higher than the seasonally flooded formations (0.152 ± 0.072 yr−1; 13–37 years). This result reflects the dominance of species with high wood density in seasonally flooded formations. In both formations 95% of the dead wood is expected to disappear within 30–40 years. Based on our results, we conclude that the CWD decomposition in the studied area is slower in forests on nutrient-poor seasonally flooded soils, where structure and species composition result in ∼40% of the aboveground biomass being in tree species with high wood density. Thus, it is estimated that CWD in seasonally flooded forest formations has longer residence time and slower carbon release by decomposition (respiration) than in unflooded forests. These results improve our ability to model stocks and fluxes of carbon derived from decomposition of dead wood in undisturbed oligotrophic forests in the Rio Negro-Rio Branco Basin, northern Brazilian Amazon. © 2017 The Authors
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64310
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Environmental Dynamics, National Institute for Research in Amazonia (INPA), Roraima Office (NPRR), Rua Coronel Pinto 315 – Centro, Boa Vista, Roraima, Brazil; Brazilian Research Network on Climate Change (RedeClima), Brazil; Embrapa Roraima, BR 174, Km 8, Boa Vista, Roraima, Brazil; Post-graduate Program in Botany (PPG BOT), National Institute for Research in Amazonia (INPA), Av. André Araújo 2936, Manaus, Amazonas, Brazil; Department of Integrative Biology, University of California, 3040 Valley Life Sciences Building # 3140, Berkeley, CA, United States; Post-graduate Program in Tropical Forest Science (PPG CFT), National Institute for Research in Amazonia (INPA), Av. André Araújo 2936, Manaus, Amazonas, Brazil; Department of Environmental Dynamics, National Institute for Research in Amazonia (INPA), Av. André Araújo 2936, Manaus, Amazonas, Brazil

Recommended Citation:
Barbosa R.I.,de Castilho C.V.,de Oliveira Perdiz R.,et al. Decomposition rates of coarse woody debris in undisturbed Amazonian seasonally flooded and unflooded forests in the Rio Negro-Rio Branco Basin in Roraima, Brazil[J]. Forest Ecology and Management,2017-01-01,397
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