Amazon forest biomass: intra- and interspecific variability in wood density drive divergences in Brazil’s far north

iForest: Biogeosciences and Forestry

article

Hugo Leonardo Sousa Farias¹  Pedro Aurélio Costa Lima Pequeno¹  Williamar Rodrigues Silva¹  Valdinar Ferreira Melo²  Lidiany Camila Da Silva Carvalho³  Ricardo De Oliveira Perdiz⁴  Arthur Camurça Citó⁵  Philip Martin Fearnside⁶  Reinaldo Imbrozio Barbosa⁵ 

[1] Universidade Federal de Roraima - UFRR, Programa de Pós-graduação em Recursos Naturais - PRONAT, Campus Paricarana;Universidade Federal de Roraima - UFRR, Departamento de Solos e Engenharia Agrícola, Campus Cauamé;University of Exeter, Prince of Wales Road;Instituto Nacional de Pesquisas da Amazônia - INPA, Programa de Pós-graduação em Botnica - PPGBOT;Instituto Nacional de Pesquisas da Amazônia - INPA, Núcleo de Pesquisas de Roraima -NPRR;Instituto Nacional de Pesquisas da Amazônia - INPA

关键词: Basic Density;    Maracá;    Roraima;    Seasonal Forests;    Wood Specific Gravity;   

DOI  :  10.3832/ifor4137-016

学科分类：社会科学、人文和艺术（综合）

来源: Societa Italiana di Selvicoltura ed Ecologia Forestale (S I S E F)

【 摘 要 】

Wood density (WD) is an important functional trait of tree species. Understanding spatial WD variability as a function of environmental determinants improves our ability to estimate carbon stocks in the woody biomass of tropical forests. However, the role of each environmental variable affecting the intra- and interspecific variability of WD is not entirely clear for most forest ecosystems. In Amazonia there are recurrent uncertainties in estimates of regional woody biomass. The aim of the study was to investigate the effects of environmental conditions on the intra- and interspecific variability of WD for tree assemblages in forests of the northern Brazilian Amazon. A single sample was extracted from each of 680 individuals (108 species, 82 genera, 38 families; stem diameter ≥10 cm) dispersed among 129 plots distributed along a hydro-edaphic gradient. General community-averaged WD (0.703 ± 0.133 g cm-3; range: 0.203 to 1.102 g cm-30.650 g cm-3). Altitude (a proxy for drainage), clay and soil micronutrient content explained 23% of the spatial variation in WD. Partitioning WD variation into species-substitution (turnover) and intraspecific-variation components slightly increased the explanatory power to 26%. The analysis of interspecific variability showed that forests occurring in seasonally flooded areas are characterized by tree assemblages with species tolerant to P-poor soils, where mean WD (0.742 g cm-3) is about 4% higher than the mean (0.713 g cm-3) for tree assemblages on unflooded uplands where soils have less limitations from nutrient poverty. Our results represent an improvement in the estimates of biomass because they promote adjustments (1.4%-16.3%) to the previous estimates of woody biomass in the northern Brazilian Amazon forests considering different environmental conditions.

【 授权许可】

Unknown