AMARAL, I.

ANDRADE, A.

CASTILHO, C. V. de

FELDPAUSCH, T.

LAURANCE, S. G. W.

LUGLI, L.

LUIZAO, F. J.

MARTINS, D. L.

OBLITAS, E.

OLIVEIRA, A.

PHILLIPS, O. L.

QUESADA, C. A.

SCHIETTI, J.

TOLEDO, J. J.

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When:June 23 - 27, 2013Where:San Jose, Costa RicaATBC Online Web ProgramP3b-11Soil physical constraints impacts on forest structure drive CWD stocks across central AmazoniaWednesday, 26 June 2013South Hall (Herradura San Jose)Demetrius Lira Martins , Instituto Nacional de Pesquisas da Amazônia, BrazilJuliana Schietti , Instituto Nacional de Pesquisas da Amazônia, BrazilTed Feldpausch , School of Geography, University of Leeds, United KingdomFlavio J Luizao , National Institute for Amazonian Research - INPA, BrazilOliver L Phillips , School of Geography, University of Leeds, United KingdomAna Andrade , Biological Dynamics of Forest Fragments Project, National Institute for Amazonian Research - INPA, BrazilCarolina Castillho , Empresa Brasileira de Pesquisa Agropecuária, BrazilSusan G. W. Laurance , Centre for Tropical Environmental and Sustainability Science, School of Marine and Tropical Biology, James CookUniversity, AustraliaAtila Oliveira , Coordenação de Pesquisas em Ecologia, Instituto Nacional de Pesquisas da Amazônia, BrazilIeda Amaral , Coordenação de Biodiversidade/Botânica, Instituto Nacional de Pesquisas da Amazônia, BrazilJose Julio Toledo , Universidade Estadual de Roraima, Campus de Rorainopolis, BrazilLaynara Lugli , National Institute for Amazonian Research - INPA, BrazilErick Oblitas , National Institute for Amazonian Research - INPA, BrazilCarlos Alberto Quesada , Instituto Nacional de Pesquisas da Amazônia, BrazilCoarse woody debris (CWD) stocks are an essential component in tropical forest ecosystems and vary widely in different forested landscapes. Relationships between CWD, soil, forest structure, and other environmental factors were analysed to understand the drivers of CWD variation indifferent soil types across Central Amazonia. To estimate CWD stocks and density of dead wood debris, 79 plots of 0.5 ha were assessed along atransect spanning ~700 km in undisturbed forests from north of the Rio Negro to south of the Rio Amazonas. Soil physical properties wereevaluated by digging 2 m deep pits and taking auger samples. Vegetation data were obtained from permanent plots. Soil physical properties werethe best predictors of CWD. Soil anoxia and soil depth explained the most variation in CWD (35% and 30%, respectively). CWD stocks on non-restrictive, deep, unsaturated soils (33.1 Mg ha-1) were twice those on highly restrictive soils (16.0 Mg ha-1). A topographic index, which describesthe spatial distribution of soil moisture, also explained significant variation in CWD stocks. Forest structure (average biomass per tree) wascontrolled by soil physical conditions which in turn had a strong influence on local CWD stocks. Vegetation parameters, biomass per tree were alsoimportant drivers explaining about 20% of the variation. Soil physical restrictions hamper tree establishment and survival decreasing averageresidence time of trees, resulting in a forest population of thinner and shorter trees that store individually less biomass. On the other hand, forestson soils without physical limitations tend to be populated by larger trees, simply because they can live longer. As a consequence, the death ofindividuals with higher biomass results in higher mass mortality input and, therefore, higher CWD stocks.PresentationsDemetrius_Martins_Soil_physical_constraints_impacts_on_forest_structure.pdf (2.0 MB)See more of: Posters: Ecosystem and Landscape Ecology 2See more of: General Sessions<< Previous Abstract | Next Abstract >>StartBrowseBrowse by DayAuthor IndexMeeting Information

Soil physical constraints impacts on forest structure drive CWD stocks across central Amazonia.

Soil physical constraints impacts on forest structure drive CWD stocks across central Amazonia.

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