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Seminários LIMNOS #6 POR DENISE TONETTA em 03/12/2014 em Laboratório de Ecologia de Águas Continentais

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Por Denise Tonetta

o movimento de carbono entre a terra, atmosfera e oceanos. Nmeros amarelos so os fluxos naturais, e vermelho so as contribuies humanas em gigatoneladas de carbono por ano. Nmeros brancas indicam carbono armazenado304 milhes de lagos estimados277 milhes de lagos at 0,01 km2

Cobrem 3% da superfcie continental

(Downing et al. 2006)Processos envolvendo o Carbono:Altamente energticoO Carbono est em tudo!

Produo primriaRespirao Decomposio

Ciclo do CARBONO

(Cole et al., 2007)

A quantidade de carbono no planeta permanece relativamente constante mas estamos mudando as suas formas e quantidades de carbono lquido / slido / gs(Cole et al., 2007; Tranvik et al., 2009)

Algumas vias de entrada, sada e processamento de carbono em lagos e lagoas costeiras. Fonte:http://cienciahoje.uol.com.br/noticias/2011/01/lagos-e-rios-no-ciclo-de-carbonoEntrada direta de CO2

Integrando ambientes terrestres e aquticos

Integrando ambientes terrestres e aquticos

Qual o budget???By complete budget, we mean measures of: the major allochthonous inputs from surface water, groundwater groundwater, and atmospheric deposition;

losses due to outflow, sediment burial;

autochthonous primary production and ecosystem respiration.

These are the minimum fluxes needed for OC budgets to place lakes in a larger landscape context.Porque difcil obter o budget?Entradas so variveis no tempo e no espaoEntradas difusivas do ambiente terrestre so difceis de medirProcessos internos so variveis no tempo e no espaoHeterogeneidade do sedimento

Experincia na ESEC Serid Natal, RNPP e R na coluna dguaVariao diria do OD na coluna dguaCarbono no sedimentoEmisso de CO2 e CH4Modelos!!!!!Parmetros bsicosMudanas de metodologias

Carbono radioativoIstopos do Carbono/OxignioTen unasnwered questions:Lakes at the interface

Internal cycling and lakes as sinks

Lakes within changing climate and changing landscapes

Q1: What are the Allochthonous Loads to Lakes, How are They Partitioned Among Sources, and How are Loads Driven by Events?Q2: How does Control over Gas Exchange Vary by Lake and What are the Underlying Physical Factors Governing the Differences?Q3: How Does the Source of Allochthonous OC That is Loaded (That is, Fluvial OC, Leaf Fall, Peat Pore Water, and So on) Determine Its Fate in Lakes?Q4: Do the Estimated Fates for Allochthonous OC Match Estimates of External Loads?Q5: What are OC Respiration Rates for Lake Ecosystems?Q6: What Controls Burial Rates of OC, and What are the Origins of Buried OC?Q8: How is OC Cycling Coupled with Nutrients, Such As Phosphorus (P) and Nitrogen (N), and Do the Interactions Change Across Trophic States?Q9: What are the Key Gradients over Which to Study Lake OC Cycling?Q10: How will Changing Land Use and Climate Alter Lake OC Cycling?Q7: What are the Relative Concentrations of OC Derived from Internal Net Primary Production (NPP) Versus Allochthonous OC Loading to Budgets and to Aquatic Consumers?Contributions to Ecosystem ScienceIndividual lakesLake-rich regionsGlobe

Long term changes in lake OC processesNitrognio e FsforoEstratgias de gerenciamento da eutrofizao